Ma kēia hana, ʻo CoCrFeNiSi-xTiB2 (x = 2. 5%, 5. 0%, 7. 5%, 10. 0%, hakina nuipa) kiʻekiʻe entropy alloy (HEA) i hoʻopaʻa ʻia i ka laser ma ka ili 40Cr. ʻO ka māhele, microstructure, hardness, friction and wear and electrochemical corrosion properties of the coating i kālailai ʻia, a me ka hopena o nano-TiB2 ceramic particles on HEA coating. Hōʻike nā hualoaʻa i ka wā x = 2. 5%, 5. 0%, 7. 5%, ʻo ka pae hoʻopili i haku ʻia me nā ʻāpana ʻelua FCC a me BCC; i ka x = 10. 0%, hana ʻia ka boride CrB ma ke kumu o nā ʻāpana ʻelua, a hoʻololi ka microstructure uhi mai nā kristal equiaxed i nā dendrites columnar maʻamau. Hoʻonui ka microhardness o ka uhi me ka piʻi ʻana o nā ʻāpana nano-TiB2, a i ka wā x = 10. Ke 2% ka ʻike o ka TiB0, hiki i ka awelika o ka paʻakikī o ka uhi ke kiʻekiʻe loa, ʻo ia ka HV547.11, ma kahi o 2.72 mau manawa o ka substrate. ʻO nā kumu nui o ka hoʻonui ʻana i kona paʻakikī ʻo ka hoʻoikaika ʻana i ka hoʻonā paʻa a me ka hoʻopuehu ʻana. Me ka hoʻonui ʻana o ka ʻike TiB2, ua hoʻemi nui ʻia ka nalowale o ka ʻaʻahu o ka uhi ʻana. Inā x = 10.0%, ʻo 0.13 mg wale nō ke kaumaha o ka ʻaʻahu. Ma keʻano laulā, hoʻololi ka piʻi ʻana o ka ʻike TiB2 i ke ʻano o ka ʻaʻahu koʻikoʻi o ka hoʻopili ʻana mai ka ʻaʻahu abrasive koʻikoʻi a me ka lole oxidation i ka lole abrasive liʻiliʻi a me ka lole oxidation, a ua hoʻomaikaʻi maikaʻi ʻia ke kūpaʻa ʻaʻahu. Ma ka 3.5% NaCl solution, ʻoi aku ka maikaʻi o ka pale ʻana i ka corrosion o ka hoʻopili ʻia i ka wā x = 7.5%. Hua'ōlelo: high entropy alloy (HEA), pale laser, nano-ceramics, pale ʻana i ka pale ʻana, kūlia pale

ʻO 40Cr alloy structural steel kekahi o nā kila i hoʻohana pinepine ʻia no nā koho mīkini eli lanahu. Loaʻa iā ia nā waiwai mechanical piha maikaʻi, haʻahaʻa haʻahaʻa haʻahaʻa haʻahaʻa haʻahaʻa haʻahaʻa, haʻahaʻa notch sensitivity, a me ka ratio element alloy kūpono, no laila ua hoʻohana nui ʻia i ka ʻoihana hana mīkini. Eia nō naʻe, ma muli o ke ʻano o ka hana paʻakikī, ʻoki pinepine ʻia ʻo 40Cr i ka wā e ʻoki ai i nā seams lanahu, ka mea i maʻalahi i ka ʻaʻahu o luna, ka ʻino, ka deformation o nā niho a me nā hemahema ʻē aʻe, e pili nui ana i ke ola lawelawe. ʻO ka ʻenehana pale laser kekahi o nā mea maʻamau i hoʻohana ʻia ma ke kahua o ka hoʻoponopono ʻana i ka ʻili i nā makahiki i hala. Ke hoʻohana nei kēia ʻenehana i kahi kukuna laser ikaika nui e hoʻoheheʻe a hoʻopaʻa i ka pauka uhi a me ka ʻili o ka substrate e hana i kahi paʻa metallurgical maikaʻi. I ka manawa like, loaʻa i ka laser cladding nā mea maikaʻi o ka hoʻomaha wikiwiki, hoʻopaʻa paʻa wikiwiki, wahi liʻiliʻi i hoʻopili ʻia i ka wela, a me ke ʻano o ka uhi uhi. Hiki iā ia ke hoʻomaikaʻi i ka paʻakikī, ka pale ʻana a me ke kūpaʻa corrosion o ka ʻili o ka uhi. ʻO kāna mau pono kūʻokoʻa a me nā manaʻo noi nui e hopohopo nui ia. ʻAʻole e like me nā mea hoʻohui kuʻuna, nā mea hoʻohui kiʻekiʻe-entropy (HEAs) he mau huila i hoʻokumu ʻia me ʻelima a ʻoi aʻe paha nā mea i loko o nā ratio molar like a kokoke like paha. I loko o ka manaʻo hoʻohui kuʻuna, ke hui ʻia nā mea nui he nui, hana maʻalahi nā pūhui intermetallic, e hopena i ka emi nui o ka hana piha o ka mea. He ʻokoʻa nā HEA. Loaʻa iā lākou nā "hopena ʻehā" ʻokoʻa e hiki ke kāohi i ka hoʻokumu ʻana o nā pūhui intermetallic, e loaʻa iā lākou ka ikaika kiʻekiʻe, kiʻekiʻe paʻakikī, maikaʻi loa ka hana wela kiʻekiʻe a me ka ʻaʻahu a me ka pale ʻana i ka corrosion. Hoʻokaʻawale pinepine ʻia ko lākou ʻano i loko i ka FCC, BCC, a me ka HCP solid solution phases. Hoʻomaikaʻi ʻo HEA i nā waiwai mechanical o nā alaleʻa ma o ka hoʻoikaika ʻana i ka hopena paʻa a me ka hoʻoikaika ʻana i ka lua. Ua hōʻike ʻia nā haʻawina e loaʻa i ka ʻenehana pale laser ka hopena o ka hoʻomaʻemaʻe ʻana i ka palaoa. No laila, ʻo ka hoʻomākaukau ʻana i nā HEA ma ka pale ʻana i ka laser ke koho maikaʻi loa.

I mea e hoʻomaikaʻi hou ai i ka paʻakikī a me ke kūpaʻa ʻana o nā uhi HEA, ke nānā nui nei nā mea noiʻi i nā hopena o nā ʻāpana seramika like ʻole (e like me TiC, NbC, B4C a me TiB2) i ka hana o HEA. ʻO Shang et al. ua hoʻomākaukau i ka nano-TiC particle-reinforced (Cr-Fe4Co4Ni4) Cr3HEA uhi ma luna o ka 904L stainless steel. Me ka hoʻohui ʻana o TiC, ua hoʻomaikaʻi maikaʻi ʻia ka paʻakikī, ke kūpaʻa a me ka pale ʻana i ka corrosion o ka uhi ʻana. I ka hoʻohui ʻia ʻana o 15% (puʻu hapa nui) TiC, ʻoi aku ka paʻakikī o ka paʻa ʻana o ka mea hoʻopili i ʻelua ʻelua o ko ka substrate. ʻO Dong et al. ua hoʻomākaukau i ka Al-CrCoFeNi2.1-xTiB2HEAs i uhi ʻia ma luna o ka ili o 304 kila kuhiliʻole e ka ultra-high-speed laser cladding. Ua hōʻike nā hopena i ka hoʻohui ʻana o TiB2 i hoʻomaikaʻi i ka paʻakikī a me ke kūpaʻa ʻana o ka uhi ʻana, a ua emi ka nui o ka lole me ka piʻi ʻana o nā ʻāpana TiB2. Zhao et al. i hoʻomākaukau ʻia nā ʻāpana seramika B4C a me SiC i hoʻoikaika ʻia i nā uhi CoCrFeNiTi HEA e ka ʻenehana hoʻopaʻa ʻana i ka laser. Ua hōʻike nā hopena i loaʻa i ka B4C ka hana maikaʻi loa ma ka hana alloy. Ua hoʻonui ʻia ka paʻakikī o ka uhi mai HV0.5666.2 a i HV0.5886.9. I ka manawa like, ua hoʻonui ʻia ke kūpaʻa ʻana o ka lumi wela, a ua emi nui ka friction coefficient a me ka nui o ka lole. Ma waena o nā ʻāpana seramika, ʻo nā ʻāpana TiB2 kekahi o nā hana paʻakikī maʻamau. Loaʻa iā lākou ka paʻakikī kiʻekiʻe, haʻahaʻa haʻahaʻa haʻahaʻa hoʻonui hoʻonui, ʻoi aku ka maikaʻi o ka wela, a me ka ʻaʻahu maikaʻi loa a me ka pale ʻana i ka corrosion. Hiki i kēia mau hiʻohiʻona ke hoʻomaikaʻi maikaʻi i nā waiwai mechanical o nā uhi HEA.

He liʻiliʻi nā haʻawina e pili ana i ka hopena o nā ʻāpana seramika metala nano-TiB2 i ka hana o CoCrFeNiSi HEA. No laila, ua hoʻomākaukau kēia hana CoCrFeNiSi-xTiB2 (x = 2.5%, 5.0%, 7.5%, 10.0%, ka hakina nui, ka like ma lalo) HEA composite uhi ma luna o ka ili o 40Cr kila ma ka laser cladding, a kālailai i ka hopena o ka nano-TiB2 ma ka microhardness, friction a me ka hoʻoheheʻe 'ana o ke kapa komo a me ka hoʻopiliʻana o HEAspective waiwai. a me ka pae.

1. Hoʻokolohua

ʻO ka substrate he kila 40Cr me ka nui o 150 mm × 60 mm × 8 mm. ʻO nā mea pale he 40-70 μm kiʻekiʻe-maʻemaʻe Co, Cr, Fe, Ni, Si one powders a me 650-800 nm TiB2 pauka. 2.5%, 5.0%, 7.5%, a me 10.0% TiB2 metala seramika pauka i hoohuiia i CoCrFeNiSiHEA pauda pakahi, a hui pu ia na pauka iloko o ka KQM-ZB planetary ball mill no 3 h. Hoʻohana ʻia ʻo YLS-2000 fiber laser e hana i ka pale ʻana i ka laser ma ke ʻano o nā pauka pre-setting. Ma mua o ka hoʻopaʻa ʻana, hoʻoulu ʻia nā pauka i hui pū ʻia me ka waiʻona polyvinyl binder (2%) a kau ʻia ma luna o ka substrate me ka mānoanoa o 1.45 mm. Wahi a ka noiʻi hoʻokolohua mua o ka pūʻulu noiʻi, ʻo nā kaʻina hana maikaʻi loa no ka pale ʻana he mana laser o 900 W, scanning rate o 4 mm·s-1, a me kahi anawaena o 2. 0 mm, overlap rate 30%. No ka hōʻoia ʻana i ka maikaʻi o ka ʻāpana pale, ua hoʻohana ʻia ʻo argon i ke kinoea pale i ka wā o ke kaʻina hana.

Ma hope o ke kaʻina hana cladding, ua hana ʻia ka hāpana e ka ʻoki uea me kahi electrospark, a ʻo kona nui ʻo 8 mm × 8 mm × 8 mm, a ʻo ka nui o ka overlap sample he 25 mm × 8 mm × 8 mm, a laila poni ʻia me ka sandpaper. Ua ʻike ʻia ke ʻano o ka pae o ka uhi ʻana e ka D8-Advance X-ray diffractometer, ʻo ka mea i hoʻopaʻa ʻia he pahu keleawe, a ʻo 20-100 ° ka laulā. Aqua regia (volume ratio o concentrated hydrochloric acid i concentrated nitric acid 3:1) ua kohoia e like me ka corrosion solution, a ua ikeia ka microstructure o ka laana e 4XB inverted metallographic microscope a me SUPRA55VP field emission electron microscope. Ua hoʻohana ʻia ka ikehu dispersive spectrometer (EDS) no ke kālailai ʻana i ka puʻunaue element, a ua ana ʻia ka paʻakikī o ka uhi e kahi mea hōʻike microhardness. ʻO 1 000 N ka hoʻouka ʻana, a ʻo ka manawa hoʻouka he 15 s. Ma ka ʻāpana keʻa o ka hāpana, ua hana ʻia ka hoʻāʻo mai ka piko o ka uhi a i ka piko o ka substrate. Ua ana ʻia kēlā me kēia hāpana i ʻekolu manawa a ua lawe ʻia ka waiwai awelika. Ua hana ʻia ka hoʻāʻo ʻaʻahu me ka M-5000 friction a me ka mīkini lole. Ua koho ʻia ke kuʻekuʻe wāwae maloʻo. Ua hoʻohana ʻia ka lua wili Si3N4. ʻO ka haʻawe maʻamau he 20 N, ʻo ke alapine he 2 Hz, ʻo ka manawa hoʻohana he 30 min, a he 20 mm ka lōʻihi hoʻihoʻi. Ua helu ʻia ka velocity sliding a me ka lōʻihi o ka heʻe ʻana he 4 knm/s a me 72 m.

2 Nā hualoaʻa a me ke kūkākūkā

2.1 Hōʻuluʻulu manaʻo

Hōʻike ka Kiʻi 1 i ke kikoʻī XRD o ka CoCrFeNiSi-xTiB2HEA i hoʻopili ʻia. Hōʻike ka XRD spectra i ka CoCrFeNiSi-xTiB2 (x = 2.5%, 5.0%, 7.5%) HEA composite coating i haku ʻia me ka pae BCC a me ka pae FCC. Inā x = 10.0%, hoʻopuka ka uhi ʻana i ka hui intermetallic CrB ma ke kumu o nā pae kumu ʻelua. Ma muli paha o ka hoʻohuihui ʻino ʻana o ka mea ʻole B metala a me ka mea Cr. Me ka piʻi ʻana o ka nano-TiB2, e emi mālie ana ka ʻike o ka māhele FCC a e piʻi mālie ka ʻike o ka pae BCC. ʻO ke kumu, ʻo ka hapa o nā mea Ti a me B i hoʻoheheʻe ʻia e nano-TiB2 i ka hoʻopaʻa ʻana i ka laser e hoʻoikaika i ka hoʻokumu ʻana o ka pae BCC, i kūlike me nā hopena o kekahi mau noiʻi mua [23-26], e hōʻike ana i nā mea Ti a me B i hoʻohui ʻia i HEA hiki ke pāʻani i ke kuleana o BCC stabilizer a me ka hoʻonā hoʻonā paʻa. Eia kekahi, ʻaʻole i ʻike ʻia kahi peak diffraction TiB2 i ka spectra o nā ʻāpana composite a pau, e hōʻike ana ua hoʻopau loa ʻia nā ʻāpana nano-TiB2 a i ʻole ko lākou helu ma lalo o ka pae ʻike XRD. Ke nānā nei i ke kiʻi i hoʻonui ʻia ma ka ʻaoʻao ʻākau o luna o ke Kiʻi 1, hiki ke ʻike maopopo ʻia ka neʻe ʻana o ka piko ʻokoʻa (110) o ka māhele BCC i kahi kihi nui, e hōʻike ana i ka emi ʻana o ka lattice mau o BCC. Ma muli paha o ka hoʻoheheʻe ʻia ʻana o nā ʻāpana TiB2 i ka wā o ka hoʻopaʻa ʻana i ka laser, kahi e hoʻoheheʻe ʻia ai nā ʻātoma B me ka radius element liʻiliʻi a hoʻololi i nā mea ʻē aʻe i ka hoʻolālā pae BCC. Wahi a ke kānāwai Bragg, ʻo ke kiʻekiʻe nui o ka ʻokoʻa BCC o ka uhi ʻana e hoʻololi i ka ʻākau. Ua hoʻohana ʻia ke kumu no ka hoʻokomo koke ʻana i ka spectrum XRD, a ua helu ʻia ka nui o ka palaoa (D) o ka CoCrFeNiSi-xTiB2 HEA composite coating ma ke kumu (1), e like me ka mea i hōʻike ʻia ma ka Papa 1. ʻO ka nui o ka palaoa (D*) o CoCrFeNiSi-xTiB2 (x = 2.5%, 5.0%%, HE 7.5% ka hui pū ʻana, 10.0% ka hui pū ʻana. ʻO 15.89, 15.30, 14.97, 14.12 nm, e hōʻike ana i ka hoʻohui ʻana o nā nano-TiB2 i nā ʻāpana CoCrFeNiSi HEA hiki ke hōʻemi pono i ka nui o ka palaoa a me ka hoʻomaʻemaʻe i ke ʻano o ka palaoa o nā mea hoʻohuihui. ʻO kēia no ka mea ʻo TiB2 particles he heterogeneous nucleating agent e hiki ke hoʻonui i ka helu nucleation a pēlā e hoʻomaʻemaʻe ai i nā kīʻaha uhi.
E nānā i ke kumu (1) ma ke kiʻi, kahi: k he mau (0.89), ʻo λ ka lōʻihi nalu X-ray (0.15405 nm), ʻo β ​​ka laulā hapalua kiʻekiʻe o ka piko diffraction (FWHM), a ʻo θ ke kihi ʻokoʻa.

2. 2 Microstructure

Hōʻike ʻia ka microstructure o ka CoCrFeNiSi-xTiB2 HEA composite coating ma ke Kiʻi 2. ʻO nā mea e pili ana i nā mea kemika e pili ana i nā wahi i kaha ʻia ma ka Figure 2 i helu ʻia ma ka Papa 2. Mai nā kiʻi SEM, hiki ke ʻike ʻia ke ʻano o ka CoCrFeNiSi-xTiB2 HEA composite coating e hōʻike ana i ʻelua mau ʻāpana ʻokoʻa a me nā ʻāpana ʻeleʻele (DRD gray dendrite. nā ʻāina. ʻO nā ʻāpana DR a me ID he mau ʻano hoʻonā paʻa maʻamau i nā uhi HEA i hoʻomākaukau ʻia e ka pale ʻana i ka laser. Mai ka nānā ʻana o EDS o nā helu hoʻāʻo uhi, hiki ke ʻike ʻia ʻo ka ʻāina DR ka nui o nā mea Fe a me Ni, aʻo ka ʻāina ID ka nui o nā mea Fe, Cr a me Ti. No laila, pili ka ʻāina DR i ka ʻōnaehana hoʻonā paʻa FCC i waiwai i ka Fe a me Ni, a ʻo ka ʻāina ID e pili ana i ka BCC paʻa paʻa paʻa waiwai i Fe a me Cr, i kūlike me nā hopena o ka loiloi XRD mua. Hoʻohui hou ʻia me ka Figure 2 a me ka Papa 2, hiki ke ʻike ʻia i ka wā x = 2.5%, ʻo ka microstructure o ka uhi ʻana he ʻano aniani like like. Ke hoʻololi ʻo x = 5.0%, hoʻololi ka microstructure uhi mai ke aniani equiaxed a i ke ʻano dendrite columnar. Ke x = 7.5%, 10.0%, ua hoʻololi loa ka microstructure uhi i ka dendrite columnar. Hōʻike ka Kiʻi 3 i ka nānā ʻana i ka ʻili o EDS a me ka puʻunaue ʻana o ka mea i hoʻopili ʻia i ka wā x = 5.0%, 10.0%. Hoʻohui ʻia me ka ʻikepili ma ka Papa 2, hiki ke ʻike ʻia ke hoʻohui ʻia kahi mea liʻiliʻi o nā ʻāpana nano-TiB2 (x = 2.5%), hōʻike ʻia ka hoʻopili ʻana i ka hoʻokaʻawale ʻana o Si element, a me ka hoʻonui ʻana o ka TiB2 maʻiʻo, nāwaliwali ka hoʻokaʻawale ʻana o ka element Si a ma hope ke ʻano like. ʻO kēia no ka mea ʻo ka hoʻohui ʻana o TiB2 e hoʻoikaika i ka hāʻawi hou ʻana i nā solutes, a ʻo ka mea Ti he mana ikaika e hoʻokaʻawale i ka palena ʻai. ʻO kēia inhomogeneity kūloko ka mea e hoʻokaʻawale ai ka mea Ti i ka palena o ka palaoa ma mua o ka mea Si, kahi e kāohi ai i ka hoʻokaʻawale ʻana o ka mea Si i kekahi ʻano. Eia kekahi, inā ʻo x = 2.5%, 5.0%, ua hoʻohele like ʻia ka mea B i loko o ka uhi hoʻohuihui ma muli o kāna mea liʻiliʻi liʻiliʻi. Me ka hoʻonui ʻana o ka ʻike TiB2, aia ka mea B ma ke ʻano o ka hoʻokaʻawale ʻana ma ka palena o ka palaoa, kahi e hoʻemi ai i ka nui o ka palaoa.

2.3 Microhardness

Hōʻike ʻia ka pānaʻi mahele o ka microhardness o ka uhi hoʻohuihui ma ka ʻaoʻao hohonu ma ke Kiʻi 4. Hoʻokaʻawale ʻia ka pihi paʻakikī i ʻekolu mau ʻāpana: ʻāpana pale, kahi i hoʻopili ʻia i ka wela a me kahi substrate. Hoʻokaʻawale ʻia kēlā me kēia māhele e kahi laina kikoʻī kū i ke kiʻi. ʻOi aku ka kiʻekiʻe o ka microhardness o ka wahi i hoʻopili ʻia i ka wela no ka mea ʻo ka hoʻopaʻa ʻana i ka laser he mau hiʻohiʻona o ka hoʻoilo wikiwiki a me ka paʻa paʻa. ʻO ke kaʻina hana hoʻomaha wikiwiki mai kahi kūlana wela kiʻekiʻe e like me ke kinai ʻana, hiki ke hoʻomaikaʻi i ka paʻakikī. ʻO ka microhardness maʻamau o ka CoCrFeNiSi-xTiB2 (x = 2.5%, 5.0%, 7.5%, 10.0%) HEA composite coating a me 40Cr substrate he HV342.98, HV404.13, HV460.51, HV547.11 kēlā me kēia. ʻO ka uhi ʻana he 201.23 manawa, 1.7 manawa, 2.0 manawa, a me 2.0 manawa o ka substrate. 29 manawa a me 2.72 manawa. Hiki ke ʻike maopopo ʻia mai ka Figure 4 me ka hoʻonui ʻia o ka ʻike o nā mea nano-TiB2, piʻi mālie ka microhardness o ka uhi ʻana. Ke x = 2.5%, 5.0%, haʻahaʻa ka microhardness o ka uhi. Hiki i nā kumu ke komo: ① He liʻiliʻi ka maʻiʻo o ka TiB2 i hoʻohui ʻia, hiki ke hoʻoheheʻe ʻia nā ʻātoma Ti i loko o ka hopena paʻa a hoʻololi i nā ʻātoma ʻē aʻe a i ʻole nā ​​mana B e komo ana i nā hakahaka interstitial lattice liʻiliʻi, liʻiliʻi ka distortion lattice, a ʻaʻole maopopo ka hoʻoikaika ʻana i ka hopena paʻa; ② Inā ʻo x = 2.5%, 5.0%, ʻoi aku ka nui o ka ʻike o ka māhele FCC ma mua o ka pae BCC, ʻoi aku ka kiʻekiʻe o ka ductility o ka pae FCC, akā ʻoi aku kona ikaika ma mua o ka pae BCC. Ke x = 7.5%, 10.0%, haʻahaʻa ka microhardness o ka uhi. He haʻahaʻa ka microhardness o ka uhi. Ina x = 8.5%, 11.0%, 12.0%, 14.0%, 16.0%, 18.0%, 19.0%, 20.0%, 21.0%, 23.0%, 24.0%, 26.0%, 27.0%, 28.0%, 29.0% 24.0%, 26.0%, 27.0 … Ina x = 28%, ua kiekie loa ka microhardness o ka uhi hui. ʻO kēia no ka mea me ka hoʻonui ʻana o ka maʻiʻo nano-TiB2, hoʻololi ke ʻano FCC i ke ʻano o ka pae BCC, a ʻoi aku ka kiʻekiʻe o ka maʻiʻo BCC i loko o ka uhi ʻana; me ka hoʻonui ʻana o nā mea Ti a me B, ʻo nā ʻātoma Ti me ka radius nui aʻe e hoʻoheheʻe ʻia i loko o ka hopena paʻa a hoʻololi i nā ʻātoma ʻē aʻe a noho i ke kūlana lattice, ʻoiai nā ʻātoma B e noho i nā hakahaka interstitial i ka lattice ma ke ʻano he interstitial atoms. ʻO ka hopena hui o nā mea ʻelua e alakaʻi i ka distortion lattice koʻikoʻi, kahi e hoʻonui ai i ke kiʻekiʻe o ka hoʻoikaika paʻa paʻa. Ke x = 10.0%, hoʻokumu ʻia ka hui intermetallic CrB i loko o ka uhi hoʻohuihui, e hopena i ka hoʻopuehu ʻana o ka uhi. ʻO ka hoʻopaʻa paʻa wikiwiki ʻana i ka wā laser cladding e kōkua pū i ka hoʻomaikaʻi ʻana i ka solubility a hoʻonui i ka hopena hoʻoikaika ikaika. Eia kekahi, ʻo ka hoʻokomo ʻana o ka mea B e hoʻomalu i ka nui o ka palaoa, hoʻomaʻemaʻe i nā kīʻaha, hoʻonui i ka nui o nā palena o ka palaoa, a me nā palena o ka palaoa i mea e pale ai i ka neʻe ʻana o nā dislocations, no laila ke hōʻike nei ka uhi i ka microhardness kiʻekiʻe. Wahi a ke kaulike Hall-Petch Hg = H0 + kd1/2, ua like ka paʻakikī o ka uhi ʻana me ka nui o ka palaoa.

2.4 ʻO nā waiwai piliki a ʻaʻahu

2.4.1 Ka hoʻoemi ʻana a me ke kaumaha o ke kaumaha

Hōʻike ka Figure 5 i ka pihi friction coefficient (COF) o ka CoCrFeNiSi-xTiB2 HEA composite coating, e hōʻike ana i ʻelua mau ʻanuʻu like ʻole: ke kahua holo-i loko a me ke kahua ʻaʻahu kūpaʻa. I ke kahua holo-i, pili mua ka pōpō palaki Si3N4 i ka ʻili o ka papa pale. I ka wā o ka hoʻopaʻapaʻa a me ka ʻaʻahu ʻana, e hana ʻia ka ʻōpala ma luna o ka ʻili o ka ʻāpana pale, a e kū mai ka friction hoʻopili kikoʻī, e hopena i ka paʻa ʻole a me ka piʻi nui ʻana o ka friction coefficient. Me ka hoʻonui ʻana o ka manawa ʻaʻahu, piʻi mālie ka wahi pili pili a lilo i friction pili i luna, e hoʻolilo i ka ʻōnaehana friction i paʻa a komo i ke kahua ʻaʻahu paʻa. I kēia pae, ʻo ka COF o ka CoCrFeNiSi-xTiB2HEA i hoʻopaʻa ʻia ma waena o 0.67 a me 0.72, e hōʻike ana he liʻiliʻi ka hopena o ka maʻiʻo o nā ʻāpana nano-TiB2 i ka COF o ka hoʻopaʻa ʻia ʻana i ke kahua paʻa. Ua ʻike ʻia nā ʻano like ʻole ma nā hōʻike mua. Hōʻike ka Figure 6a i ka ʻawelike friction coefficient ma waena o ka substrate a me ka uhi ʻana. Hiki ke ʻike ʻia ʻoi aku ka haʻahaʻa o ka COF o ka uhi hoʻohuihui ma mua o ka substrate 40Cr. Hōʻike ke kiʻi 6b i ke kaumaha o ka pohō o ka paona a me ka uhi ʻana. Hiki ke ʻike ʻia ʻo ka hoʻopili ʻana me ka hoʻohui ʻana o nā ʻāpana nano-TiB2 e hoʻomaikaʻi nui i ka friction a me nā waiwai o ka substrate. Ke x = 10.0%, ua ho'emi 'ia ke kaumaha o ka pohō o ka uhi ho'ohuihui e 88% ke ho'ohālikelike 'ia me ka substrate.

2.4.2 E aahu i ka leo a me ka lole

I mea e 'imi hou aku ai i ka pale aahu o ka substrate a me ka ho'opili'ia, ua ho'okō 'ia ka 'ikepili 'ekolu-dimensional o nā kaha 'a'ahu o nā hō'ailona, ​​a ua unuhi 'ia ka palapala 'āina 3D a me ka 'a'ahu 'ikepili o ka substrate a me ka uhi 'ana, e like me ia i hō'ike 'ia ma ke Ki'i 7. I ka ho'ohālikelike 'ia me ka substrate, ua ho'emi 'ia ka laula a me ka hohonu o ka uhi 'ana i ka nano-Ti2 ma ke 'ano. ʻO nā wahi keʻa o nā ʻōpala ʻaʻahu o ka substrate 40Cr a me ka CoCrFeNiSi-xTiB2 (x = 2.5%, 5.0%, 7.5%, 10.0%) i uhi ʻia he 5 696.85, 1 250.10, 1 233.45, 1, 122.02, 770.74, 2, 2. i kēlā me kēia, e hōʻike ana i ka emi ʻana o ka ʻāpana cross-sectional o nā ʻōpala i loko o nā uhi me ka hoʻonui ʻana o ka ʻike TiB2, a hoʻomau ka emi ʻana o ka nui o ka lole. Ke hoʻohana nei i ke ʻano (8) no ka helu ʻana i ka nui o ka ʻaʻahu ʻana o ka uhi, hōʻike ka Helu 40 i ka nui o ka ʻaʻahu a me ka nui o ka lole o ka substrate 2Cr a me ka uhi CoCrFeNiSi-xTiB2.5 (x = 5.0%, 7.5%, 10.0%, 0.056%). ʻO ka nui o kā lākou ʻaʻahu ʻana he 97 0.012, 50 0.012, 33 0.011, 22 0.007, a me 71 3 mm39.561, a he 5 10 × 6-8.681, 3 10 × 6-8.565, 6 10 × 6-7.791. 8×10-6, a me 5.352 4×10-6 mm3·N-1·m-1. ʻO ke ʻano o ka friction a me ka hoʻohana ʻana o ka uhi e kūlike me ke ʻano o ka microhardness, e hōʻike ana i ka paʻakikī kiʻekiʻe e hui pū ʻia me ke kūpaʻa maikaʻi loa. Ke x = 10.0%, ʻo ka uhi ʻana ka liʻiliʻi loa o ka ʻaʻahu, ka leo a me ka nui o ka hoʻohana ʻana, e hōʻike ana he ʻoi aku ka maikaʻi o ka pale ʻana inā x = 10.0%.
E nānā i ke ʻano (2) ma ke kiʻi, kahi: ʻo W ka lae ʻaʻahu, ʻo Vloss ka leo ʻaʻahu, ʻo FN ka haʻawe, a ʻo H ka huina o ka mamao hoʻoheheʻe.

2.4.3 E hoʻohana i ka moʻokalaleo ili

Hōʻike ʻia ka morphology ʻili o ka ʻaʻahu o ka hāpana ma ke Kiʻi 9, e hōʻike hou ana i ke kaʻina hana hiki ke hoʻohana ʻia e pili ana i ka substrate a me ka uhi ʻana. ʻO ke kiʻi 9a ka morphology scar wear o ka substrate 40Cr. Hōʻike ʻia ka deformation plastic ma ka ʻili o ka substrate. Hiki ke ʻike ʻia kahi helu nui o nā lua peeling a me nā ʻāpana adhesion ma ka ʻaoʻao sliding. Hoʻopili ka ʻōpala lole i hana ʻia i ka ʻili lole. I ka manawa like, me ka hana o ka hoʻouka ʻana, ua hoʻokumu ʻia kahi papa adhesion ma ka ʻili o ka ʻili. Ma muli o ka microhardness haʻahaʻa o ka substrate, i ka wā e hoʻoheheʻe ai i pili i ka paʻa paʻa, ʻo ka hoʻouka ʻana ke kumu i ka hoʻoheheʻe ʻana i ka plastik ma ka ʻaoʻao hāpana ma ke ala hoʻoheheʻe. ʻO ka hoʻololi ʻana i ka plastic ke kumu e ʻike ʻia ai nā microcracks ma lalo o ka ʻulaʻula o ka substrate. Hoʻonui a haki nā microcracks, ka hopena i ka ʻili ʻana i nā lua a me ka delamination ma ka ʻili o ka substrate. I ka manawa like, aia kahi helu liʻiliʻi o nā furrows ma ka ʻaoʻao substrate, e hōʻike ana i ke komo ʻana o ka substrate i ka lole adhesive i hui pū ʻia me kahi liʻiliʻi o ka lole abrasive.

Hōʻike ke kiʻi 9b-e i ka ʻaʻahu ʻulaʻula morphology o nā ʻili hoʻohui me nā mea nano-TiB2 like ʻole. Hiki ke ʻike ʻia ua hoʻokaʻawale ʻia ka ʻili ʻaʻahu i ʻelua mau ʻāpana: ka ʻāpana hina ʻeleʻele a me ka wahi hina hina. Hōʻike ka Kiʻi 10 i ka nānā ʻana i ka ikehu spectrum o ka CoCrFeNiSi-10.0%TiB2 laʻana (kahi hoʻomaka ma ka ʻaoʻao hema o ka ʻōpala ʻaʻahu). Hiki ke ʻike ʻia ʻo ke ʻano o ka puʻunaue ʻana o nā mea Si a me O i loko o ka ʻāpana hina ʻeleʻele ke kūlike, a hiki ke ʻike ʻia ʻo ka ʻāpana hina ʻeleʻele he oxide i hana ʻia e ka hui ʻana o nā mea Si a me O. Ke hoʻopaʻa hou ʻia ka lua, e hoʻomau mau ʻia ka ʻōpala o ka oxide ma luna o ka ʻili o ka uhi ʻana. Hoʻokuʻu ʻia kēia mau ʻōpala ma ka ʻaoʻao o ka friction reciprocating, akā ʻaʻole hiki ke hoʻokuʻu loa ʻia kekahi mau ʻōpala a hoʻopaʻa mau ʻia ma nā ʻauwaha a i ʻole ma nā ʻaoʻao ʻelua o nā hōʻailona ʻaʻahu, e hana ana i kahi papa oxide ma luna o ka ʻili o ka uhi ʻana. E like me ka mea i hōʻike ʻia ma ke Kiʻi 9b a me c, i ka wā x = 2.5% a me 5.0%, ʻike ʻia nā ʻāhu ākea a me ka nui o nā ʻāpana oxide ma luna o ka ʻili o ka uhi, i hui pū ʻia me kahi helu liʻiliʻi o nā lua spalling, a hiki ke ʻike ʻia nā degere like ʻole o ka deformation plastic, e hōʻike ana i ka ʻaʻahu abrasive koʻikoʻi a me ka ʻaʻahu oxidation. Ina x = 7. Inā x = 5%, hiki ke ʻike ʻia mai ke Kiʻi 9f he mau ʻāhu o ka ʻili o ka uhi ʻana i ka hohonu like ʻole, ʻo ia ke ʻano o ka lole abrasive maʻamau. Ua emi nui ka helu o nā ʻāpana oxide i loko o ka wahi hina ʻeleʻele, e hōʻike ana ua nāwaliwali ke kiʻekiʻe o ka lole oxidation. I ka manawa like, ua ʻike ʻia ma muli o ka neʻe ʻana o ka lua friction, ua hana ʻia ka nui o ka wela friction e hoʻopaʻa i ka ʻili, a ua haehae ʻia ka micro-connection e hana i ka flaky adhesion a me ka peeling lua, e hōʻike ana he ʻaʻahu adhesive ka uhi. He mea pono e hoʻomaopopo i ka wā o ka friction a me ka hoʻohana ʻana i ke kaʻina hana, hoʻopiʻi ka pālua i kahi ʻāpana o ka papa oxide, e hoʻoheheʻe ai ka ʻāpana oxide a hoʻohua i ka nui o nā ʻōpala. Ma muli o ka microhardness kiʻekiʻe o ka uhi ʻana, ʻo ka nui o nā ʻōpala ʻaʻahu e hoʻololi i ka neʻe ʻana o ka ʻili o ka lole e hoʻololi mai ka friction sliding i ka friction rolling, a laila e hōʻemi ana i ka coefficient friction o ka uhi i kekahi ʻano. Hiki ke ʻike ʻia ma ka Figure 9e i ka wā o x = 10.0%, hoʻomau ka emi ʻana o ka nui o nā ʻāpana oxide, ʻoi aku ka maʻemaʻe o ka ʻili o ka uhi ʻana, a ʻike ʻia nā ʻauwaha pāpaʻu a haiki, i hui pū ʻia me kahi lua peeling liʻiliʻi, e hōʻike ana i ka uhi ʻana he lole abrasive liʻiliʻi a me ka lole oxidation, i hui pū ʻia me kahi lole liʻiliʻi. Mai ka ʻike hoʻonui ʻia ma ka ʻaoʻao ʻākau o ke Kiʻi 9e, hiki ke ʻike ʻia he liʻiliʻi ka nui a me ka liʻiliʻi o ka ʻōpala i hoʻokahe ʻia mai ka ʻili o ka lole, no laila ua hoʻololi ʻia ka neʻe pili ʻana o ka ʻili e hoʻoheheʻe ʻia, ka mea e hoʻonui ai i ka friction coefficient o ka uhi ʻana, i kūlike me ke ʻano o ka awelika friction coefficient Figure 6a in the coating. I ka hōʻuluʻulu manaʻo, me ka hoʻonui ʻia o ka ʻike nano-TiB2, ua loli ke ʻano nui o ke kapa komo o ka uhi composite mai ka ʻaʻahu abrasive koʻikoʻi a me ka ʻaʻahu oxidation i ka ʻaʻahu abrasive iki a me ka ʻaʻahu oxidation, e hōʻike ana i ka hoʻohui ʻana o nano-TiB2 e hoʻomaikaʻi nui i ke kūpaʻa o ke kapa komo o ka uhi composite.

2.5 Electrochemical corrosion

2.5.1 Kipi polarization ikaika

Hōʻike ka Figure 11 i nā pihi polarization ikaika o 40Cr matrix a me CoCrFeNiSi-xTiB2 (x = 2.5%, 5.0%, 7.5%, 10.0%) HEA composite coating ma 3.5% NaCl solution. Hōʻike ka substrate a me ka hoʻopili ʻana i nā mokuʻāina like i ka ʻāina cathode, e hōʻike ana ʻaʻohe hopena o ka hoʻololi ʻana i ka maʻiʻo o ka nano-TiB2 ceramic particles ma ka ʻaoʻao cathode o ka pihi polarization. Hōʻike ʻia kahi paepae passivation maʻamau i ka ʻāpana anode. Ua pili ka slope o ka passivation zone curve i ke degere o ka pale o ka passivation film. Ke x = 7.5%, ʻo ka pali o ka pale passivation zone ka mea nui loa, a ʻo ka passivation lua i ka manawa like, e hōʻike ana i ka hoʻopuka ʻana i kahi kiʻiʻoniʻoni passivation denser i ka wā o ka corrosion, kahi e hoʻomaikaʻi ai i ka pale ʻana o ke kiʻi passivation.

ʻO ka hiki ke hoʻopōʻino ponoʻī (Ecorr) a me ka nui o ka corrosion o kēia manawa (Icorr) o ka CoCrFeNiSi-xTiB2 (x = 2.5%, 5.0%, 7.5%, 10.0%) HEA composite coating i loaʻa ma o ka hoʻohana ʻana i ka Tafeel polarization curve extrapolation method, e like me ka mea i hōʻike ʻia ma ka Papa 3. o ka mea, oiai ke kinetic parameter Icorr hiki ke ano i ka corrosion rate o ka mea [46-47]. Ke x = 7.5%, ʻo ka Icorr (1.252 × 10-4 A / cm2) o ka hoʻopaʻa ʻia ʻana he haʻahaʻa ma mua o nā mea hoʻonaninani ʻē aʻe, a ʻo ka Ecorr (-0.816 V) ka mea nui loa, ʻoi aku ka kiʻekiʻe ma mua o ka substrate a me nā ʻāpana ʻē aʻe, e hōʻike ana i ka CoCrFeNiSi-7.5%TiB2 pale ʻoi aku ka maikaʻi loa. Ma ka hoʻohālikelike ʻana i ka Icorr a me ka Ecorr o nā uhi ʻē aʻe, hiki ke ʻike ʻia ʻoi aku ka maikaʻi o ka pale ʻana i ka corrosion o ka CoCrFeNiSi-10.0%TiB2 ma mua o ka CoCrFeNiSi-2.5%TiB2 a me ka CoCrFeNiSi-5.0%TiB2. Ma waena o nā mea hope ʻelua, ʻoi aku ka nui o ka waiwai ʻo Ecorr o CoCrFeNiSi-2.5%TiB2 coating ma mua o ka CoCrFeNiSi-5.0%TiB2, ʻoiai ʻo kā lākou Icorrr koʻikoʻi o ke ʻano like o ka nui, no laila ʻoi aku ka maikaʻi o ke kūpaʻa corrosion o CoCrFeNiSi-2.5%TiB2. He mea pono e hoʻomaopopo i ka ʻoi aku ka maikaʻi o ke kūpaʻa ʻana o nā ʻāpana CoCrFeNiSi-xTiB2 a pau ma mua o ka 40Cr, e hōʻike ana ua hoʻomaikaʻi ʻo CoCrFeNiSi-xTiB2 coatings i ka hiki ke kū i ka Cl- intrusion a loaʻa i ka pale corrosion maikaʻi. Hoʻonohonoho ʻia ke kūpaʻa ʻino o ka substrate a me kēlā me kēia uhi e like me CoCrFeNiSi-7.5%TiB2 > CoCrFeNiSi-10.0%. 0%TiB2>CoCrFeNiSi-2. 5%TiB2>CoCrFeNiSi-5. 0%TiB2>40Cr.

2.5.2 Electrochemical impedance kālailai

ʻO ka Electrochemical impedance spectroscopy (EIS) kahi mea hana kūpono no ke aʻo ʻana i ka hana corrosion a me ka mīkini corrosion. Hōʻike ia i nā hiʻohiʻona hoʻonohonoho hoʻonohonoho o ka interface electrode ma ka hoʻohālikelike ʻana i kāna ʻike kinetic a me ka pihi polarization. ʻO nā kiʻi 12a a me 12b nā kiʻi Nyquist a me ka Papa o ka substrate a me ka CoCrFeNiSi-xTiB2 HEAs composite coating. E like me ka mea i ʻike ʻia mai ka Kiʻi 12a, ʻo ka ʻaoʻao ʻo Nyquist o ka hāpana he semicircular, ʻo ia ka mea ma muli o ka hoʻoili ʻana ma ka ʻili heterogeneous. Ua hōʻike nā haʻawina ʻoi aku ka nui o ke anawaena semicircle, ʻoi aku ka maikaʻi o ka pale ʻana i ka corrosion. ʻO nā anawaena hapalua o ke kiʻikuhi Nyquist he x = 7.5%, x = 10.0%, x = 2.5%, x = 5. 0%, 40Cr, e hōʻike ana i ka nui kūpono o nā ʻāpana TiB2 hiki ke hoʻomaikaʻi maikaʻi i ka pale ʻana i ka corrosion o ka uhi ma 3.5% NaCl solution. Ma ke kiʻikuhi Bode, hiki i ka modulus impedance Z ke kuhikuhi i ke kiʻekiʻe o ka Cl- invasion. ʻO ka nui o ka waiwai Z, ʻoi aku ka liʻiliʻi o ke degere o Cl- invasion. Ma ka waena waena (1-103 Hz) o ke Kiʻi 12, ʻo ka logarithm o ka modulus impedance a me ke alapine e hōʻike i kahi pilina laina me kahi slope ma lalo o -1. Ma kahi alapine paʻa o 0.1 Hz, ua like ka waiwai o Z me ka waiwai o ke kū'ē polarization (RP). ʻO ka ʻoi aku ka nui o ka RP, ʻoi aku ka paʻakikī o ka hoʻohālikelike ʻia ʻana [51]. E like me ka mea i hōʻike ʻia ma ke Kiʻi 12b, ma f = 10-2 Hz, ʻo ka waiwai Z o ka uhi ʻana me x = 7.5% ka mea nui loa, e hōʻike ana i ke kūpaʻa ʻino o ka kiʻiʻoniʻoni passive ma ka ʻili o ka uhi ʻana ke kiʻekiʻe loa ke x = 7.5%. Ma ka ʻāpana alapine kiʻekiʻe o 104-105 Hz, kokoke ke kihi o ka pae i ka ʻole, e hōʻike ana he haʻahaʻa ka pale ʻana. Ma ke alapine alapine, ʻaʻole hiki i ka huina o nā uhi āpau i ka 90 °, e hōʻike ana he hiʻohiʻona "semi-adaptive" ka uhi ʻana, e hōʻike ana i ka hoʻololi ʻana o ke kiʻi passivation ma ka ʻili o ka uhi ʻana i kahi papa capacitance maʻemaʻe me ka hana insulation maikaʻi. I mea e loiloi ai i ke kaʻina hana corrosion o ka uhi ʻana, ʻike ʻia ka spectrum EIS me ka hoʻohana ʻana i kahi kaapuni like. E like me ka mea i hōʻike ʻia ma ka Figure 12c, ʻo Rs ke kūpaʻa hoʻonā, ʻo Rf ke kūpaʻa kiʻiʻoniʻoni huahana corrosion, ʻo Rct ke kūʻē o ka hoʻoili ʻana o ka electrode, a ua hoʻohana ʻia kahi mea hana mau (CPE) e hoʻopaʻi i ka like ʻole o ka ʻōnaehana (ka ʻili a me nā hemahema o ka ʻili), ʻo ia ka CPE1 a me CPE2. Hiki ke ʻike maopopo ʻia mai ka Papa 4 i ka wā o x = 7.5%, ʻo Rct a me Rf ka nui loa, e hōʻike ana hoʻi ʻo ka uhi ʻana me ka x = 7.5% ʻoi aku ka maikaʻi o ka pale ʻana. I ka hōʻuluʻulu ʻana, ʻo ka substrate a me kēlā me kēia uhi ʻana i ka pale corrosion maikaʻi ma 3.5%. Ka corrosion kū'ē i loko o 5% NaCl solution ua heluʻia e like me CoCrFeNiSi-7.5% TiB2 > CoCrFeNiSi-10.0% TiB2 > CoCrFeNiSi-2.5% TiB2 > CoCrFeNiSi-5.0% TiB2 > 40Cr, i kūlike me nā hopena o ka polarization potentiodynamic.

2.5.3 ʻO ke kino o ka ʻili kino

Hōʻike ka Figure 13 i ka morphology corrosion electrochemical o 40Cr substrate a me ka uhi ʻana. Hiki ke ʻike maopopo ʻia ka ʻili o 40Cr, ʻoi aku ka koʻikoʻi o ke degere corrosion, a ʻike ʻia nā lua lua. ʻO kēia no ka mea he nui nā mea Cr ma ka ʻili o 40Cr, ʻaʻole kūlike ke kiʻi passivation i hana ʻia, hoʻopā ʻo Cl- i ka ʻāpana nāwaliwali o ke kiʻi passivation, a hana i nā chlorides hiki ke hoʻoheheʻe ʻia ma o ka ʻili kiʻiʻoniʻoni, e hopena i ke ʻano o nā lua lua. x = 2.5%, 5.0%. Inā ʻo x = 0.0% a me 10.0%, ʻoi aku ka maʻalahi o ka ʻili o ka uhi ʻia ma mua o ka substrate 40Cr, a ʻike ʻia kahi lua liʻiliʻi o nā degere like ʻole ma nā ʻaoʻao ʻelua. Ke x = 7.5%, maʻalahi ka ʻili o ka uhi ʻana a ʻaʻohe puka ʻino, e hōʻike ana he kūpaʻa maikaʻi ka pale ʻana o ka CoCrFeNiSi-7.5%TiB2. He mea pono e hoʻomaopopo i ka piʻi ʻana o ka ʻike TiB2 i 10.0%, e emi ana ka pale o ka corrosion o ka uhi. ʻO kēia ke kumu o ka hoʻohui nui ʻana o TiB2 e alakaʻi i nā mea B hou aʻe i ka uhi. Mai ka hōʻike XRD ma ke Kiʻi 1, hiki ke ʻike ʻia ua hoʻokumu ʻia ka hui intermetallic CrB i loko o ka uhi me x = 10.0%, e hoʻonui ai i ka like ʻole o ke kiʻi passivation a hoʻemi i ka pale ʻana i ka corrosion o ka passivation film i ka hopena NaCl; ʻO ka hui intermetallic CrB e hoʻokumu i kahi microbattery i loko o ka uhi, e hoʻoneʻe ai i ka galvanic corrosion. No laila, ʻoi aku ka maikaʻi o ka pale ʻana i ka corrosion o ka uhi ʻana me x = 10.0% ma mua o ka pale ʻana me x = 7.5%. Hoʻemi ʻia ka 5% uhi.

Nā Kūlana 3

(1) ʻO ka hoʻohui ʻana i nā ʻāpana nano-TiB2 i ka CoCrFeNiSi HEA coating hiki ke hoʻohaʻahaʻa maikaʻi i ka nui o ka palaoa awelika o ka uhi a hoʻomaʻemaʻe i ke ʻano o ka palaoa o ka uhi ʻana. ʻO ka papa hana o ka CoCrFeNiSi-xTiB2 HEA uhi ʻia ʻo ia ka pae FCC, ka pae BCC a me ka CrB boride. Hoʻoheheʻe ʻia nā ʻātoma Ti a me B i ka hopena paʻa, a ʻo ka hana hui ʻana o nā mea ʻelua ke alakaʻi i ka distortion lattice koʻikoʻi. Mai ka microstructure, hiki ke ʻike ʻia me ka piʻi ʻana o ka ʻike TiB2, ke hoʻololi nei ka ʻōnaehana uhi mai nā kristal equiaxed i nā dendrites columnar. I ka manawa like, ʻo ka hoʻohui ʻana o TiB2 e kāohi i ka hoʻokaʻawale ʻana o nā mea Si ma nā palena ʻai.

(2) Hoʻopili maikaʻi ʻia ka microhardness o ka uhi me ka ʻike TiB2. Ke x = 10. 0%, hiki i ka awelika microhardness o ka uhi i ka waiwai nui o HV547. 11, he 2. 72 manawa. ʻO ka hoʻomaikaʻi ʻana o ka microhardness ka hopena o ka hopena hui o ka hoʻoikaika ʻana i ka hopena paʻa, ka hoʻopuehu ʻana a me ka hoʻoikaika ʻana i ka palaoa. Hoʻonui ka pale ʻana o ka uhi me ka piʻi ʻana o ka ʻike TiB2. Ke x = 10.0%, ʻo ke kaumaha o ke kaumaha ka mea liʻiliʻi loa, hiki i ka 0.13 mg, ʻo ia ka 88% emi ma mua o ka substrate. E emi iho ana ka nui o ke kapa komo me ka piʻi ʻana o TiB2. Hoʻololi ka hoʻonui ʻana o TiB2 i ka ʻaʻahu nui o ka uhi ʻana mai ka ʻaʻahu abrasive koʻikoʻi a me ka lole oxidation i ka lole abrasive liʻiliʻi a me ka lole oxidation.

(3) E like me ka polarization curve a me ka EIS kūpono nā hopena, hiki i ka hoʻonui ʻana o ka ʻāpana ʻāpana TiB2 hiki ke hoʻomaikaʻi maikaʻi i ka pale ʻana i ka corrosion o ka uhi. ʻO ka hoʻomaikaʻi ʻana i ke kūpaʻa corrosion o ka uhi ʻana ma muli o ka passivation lua o ka uhi i ka wā o ke kaʻina hana corrosion, kahi e hana ai i kahi kiʻi passivation denser a hoʻomaikaʻi i ka hiki ke kū i ka Cl- invasion. I waena o lākou, ʻo ka CoCrFeNiSi-7.5% TiB2 ka uhi ʻana i ka pale corrosion maikaʻi loa.