CoCrFeNi ni ubushakashatsi bwizewe bushingiye kumaso bushingiye kuri cubic (fcc) cyane-entropy alloy (HEA) ifite ihindagurika ryiza ariko imbaraga nke.Ibyibandwaho muri ubu bushakashatsi ni ukunoza impirimbanyi zingufu no guhindagurika kwa HEAs wongeyeho umubare utandukanye wa SiC ukoresheje uburyo bwo gushonga arc.Bimaze kugaragara ko kuba chromium iba muri base HEA itera kubora kwa SiC mugihe cyo gushonga.Rero, imikoranire ya karubone yubusa hamwe na chromium iganisha muburyo bwo gukora karubide ya chromium, mugihe silicon yubusa ikomeza kuba igisubizo muri base HEA kandi / cyangwa igahuza nibintu bigize HEA shingiro kugirango ikore siliside.Mugihe ibirimo bya SiC byiyongera, icyiciro cya microstructure gihinduka muburyo bukurikira: fcc → fcc + eutectic → fcc + chromium carbide flake → fcc + chromium carbide flake + siliside → fcc + chromium karbide flake + silisite + imipira ya grafite.Ibicuruzwa bivamo byerekana ibintu byinshi cyane byubukanishi (imbaraga zitanga umusaruro kuva kuri 277 MPa kuri 60% kuramba kugeza kuri 2522 MPa kuri 6%) ugereranije nibisanzwe bisanzwe hamwe na entropiya nyinshi.Bimwe mubintu bihanitse bya entropiya byateguwe byerekana uburyo bwiza bwimiterere yubukanishi (gutanga umusaruro 1200 MPa, kuramba 37%) kandi bigatwara uturere tutagerwaho kubishushanyo mbonera byerekana umusaruro.Usibye kurambura bidasanzwe, ubukana nimbaraga zitanga umusaruro wa HEA biri murwego rumwe nikirahure cyinshi.Kubwibyo, byizerwa ko iterambere ryibintu byinshi-entropiya bishobora gufasha kugera kubintu byiza byimiterere yubukanishi kubikorwa byiterambere.
Iterambere rya entropie alloys ni igitekerezo gishya gitanga icyizere muri metallurgie1,2.Amavuta menshi ya entropiya (HEA) yerekanye mubihe byinshi ihuza ryiza ryimiterere yumubiri nubukanishi, harimo nubushyuhe bukabije bwumuriro3,4 kuramba birenze urugero 5,6 kurwanya umunaniro7,8 kwangirika kwangirika 9,10,11, kwihanganira kwambara neza 12,13,14 , 15 nibintu bya tribologiya15, 16,17 ndetse no mubushyuhe bwo hejuru 18,19,20,21,22 hamwe nubukanishi mubushyuhe buke 23,24,25.Ihuriro ryiza ryimiterere yubukanishi muri HEA mubusanzwe biterwa ningaruka enye zingenzi, arizo entropy nini cyane, 26, kugoreka lattice 27, gukwirakwira buhoro 28 ningaruka za cocktail29.HEAs isanzwe ishyirwa mubwoko bwa FCC, BCC na HCP.FCC HEA mubisanzwe ikubiyemo ibintu byinzibacyuho nka Co, Cr, Fe, Ni na Mn kandi ikagaragaza ihindagurika ryiza (ndetse no mubushyuhe buke25) ariko imbaraga nke.BCC HEA mubusanzwe igizwe nibintu byinshi cyane nka W, Mo, Nb, Ta, Ti na V kandi ifite imbaraga nyinshi cyane ariko ihindagurika rito nimbaraga zidasanzwe30.
Guhindura microstructural ya HEA ishingiye ku gutunganya, gutunganya imashini no kongeramo ibintu byakozweho ubushakashatsi kugirango haboneke uburyo bwiza bwimiterere yubukanishi.CoCrFeMnNi FCC HEA ikorerwa ihindagurika rikomeye rya plastike hamwe na torsion yumuvuduko ukabije, ibyo bigatuma habaho kwiyongera gukomeye (520 HV) nimbaraga (1950 MPa), ariko iterambere rya microstructure ya nanocrystalline (~ 50 nm) ituma amavuta avunika31 .Byagaragaye ko kwinjiza impanga (TWIP) no guhinduka byatewe na plastike (TRIP) muri CoCrFeMnNi HEAs bitanga akazi gakomeye bikavamo guhindagurika gukabije, nubwo bitwaye agaciro gakomeye.Hasi (1124 MPa) 32. Ishirwaho rya microstructure itondekanye (igizwe nigice cyoroshye kandi kidafite imikorere) muri CoCrFeMnNi HEA ukoresheje amashanyarazi yarashwe bituma imbaraga ziyongera, ariko iri terambere ryagarukiye kuri MPa33.Mugushakisha ibikoresho bifite imbaraga nziza zihuza imbaraga no guhindagurika, iterambere rya HEAs nyinshi hamwe na HEAs eutectic HEAs hiyongereyeho ibintu bitari isoatomic nabyo byakorewe iperereza 34,35,36,37,38,39,40,41.Mubyukuri, byagaragaye ko gukwirakwiza neza ibyiciro bikomeye kandi byoroshye muri eutectic high-entropy alloys bishobora kuganisha ku guhuza imbaraga hamwe no guhindagurika 35,38,42,43.
Sisitemu ya CoCrFeNi niyigishijwe cyane icyiciro kimwe FCC-entropy alloy.Sisitemu yerekana imirimo yihuta yo gukomera 44 hamwe nubwiza buhebuje 45,46 kubushyuhe buke kandi bwinshi.Hageragejwe uburyo butandukanye bwo kunoza imbaraga zayo nkeya (~ 300 MPa) 47,48 harimo gutunganya ingano25, microstructure ya heterogeneous 49, imvura 50,51,52 hamwe na plastike iterwa no guhinduka (TRIP) 53.Kunonosora ibinyampeke byibanze kuri cubic HEA CoCrFeNi mugushushanya ubukonje mubihe bikomeye byongera imbaraga kuva kuri 300 MPa47.48 kugeza kuri 1.2 GPa25, ariko bikagabanya igihombo cyo kuva kuri 60% kugeza kuri 12,6%.Kwiyongera kwa Al muri HEA ya CoCrFeNi byatumye hashyirwaho microstructure itandukanye, ituma umusaruro wacyo ugera kuri MPa 786 naho uburebure bwawo bugera kuri 22% 49.CoCrFeNi HEA yongerewe hamwe na Ti na Al kugirango habeho imvura, bityo bituma imvura igabanuka, yongera umusaruro wacyo kuri 645 MPa no kuramba kugera kuri 39% 51.Uburyo bwa TRIP (bushingiye ku isura cubic → hexahedral martensitike ihinduka) hamwe no kubyara byongereye imbaraga za CoCrFeNi HEA kugera kuri MPa 841 no kurambura kuruhuka kugera kuri 76% 53.
Harageragejwe kandi kongeramo imbaraga za ceramic muri HEA isura ya cubic matrix yo guteza imbere ibice byinshi bya entropiya bishobora kwerekana imbaraga nziza hamwe no guhindagurika.Ibigize hamwe na entropie ndende byatunganijwe na vacuum arc gushonga44, gukanika imashini 45,46,47,48,52,53, spark plasma sintering 46,51,52, vacuum ishyushye 45, gukanda isostatike ishyushye 47,48 no guteza imbere uburyo bwo gukora inyongeramusaruro43, 50.Carbide, oxyde na nitride nka WC44, 45, 46, Al2O347, SiC48, TiC43, 49, TiN50 na Y2O351 byakoreshejwe mu gushimangira ceramic mugutezimbere ibice bya HEA.Guhitamo neza matrike ya HEA na ceramic nibyingenzi cyane mugushushanya no guteza imbere imbaraga zikomeye kandi ziramba HEA.Muri iki gikorwa, CoCrFeNi yatoranijwe nkibikoresho bya matrix.Umubare utandukanye wa SiC wongeyeho muri CoCrFeNi HEA kandi ingaruka zazo kuri microstructure, ibice bigize icyiciro, hamwe nubukanishi byizwe.
Ibyuma byera cyane Co, Cr, Fe, na Ni (99,95 wt%) hamwe nifu ya SiC (ubuziranenge 99%, ubunini -400 mesh) muburyo bwibice byibanze byakoreshwaga nkibikoresho fatizo byo gukora ibihimbano bya HEA.Isoatomic igizwe na CoCrFeNi HEA yabanje gushyirwa mubutaka bwumuringa ukonjesha amazi yumuringa, hanyuma urugereko rwimurirwa kuri 3 · 10-5 mbar.Umwuka mwinshi wa argon watangijwe kugirango ugere ku cyuho gikenewe kugirango arc gushonga hamwe na tungsten electrode idakoreshwa.Ingoti zavuyemo zirahindurwa kandi zisubirwamo inshuro eshanu kugirango habeho ubutinganyi bwiza.Ibikoresho byinshi-entropiya yibihimbano bitandukanye byateguwe hongerwaho umubare runaka wa SiC kuri buto ya Coiatr ya CoCrFeNi yavuyemo, yongeye guhuzwa hamwe ninshuro eshanu ihinduranya kandi ikongera ikavugururwa muri buri kibazo.Akabuto kabumbwe kuva ibivuyemo byaciwe hakoreshejwe EDM kugirango irusheho kwipimisha no kuranga.Ingero zubushakashatsi bwa microstructural zateguwe ukurikije uburyo bwa metallografiya.Ubwa mbere, ingero zasuzumwe hifashishijwe microscope yoroheje (Leica Microscope DM6M) hamwe na software Leica Image Analysis (LAS Phase Impuguke) kugirango isesengure ryicyiciro.Amashusho atatu yafatiwe mubice bitandukanye hamwe nubuso bwa 27.000 µm2 byatoranijwe kugirango bisesengurwe.Ubundi bushakashatsi burambuye bwa microstructural, harimo isesengura ryibigize imiti nisesengura ryibintu byakorewe, byakorewe kuri microscope ya elegitoronike (JEOL JSM-6490LA) ifite sisitemu yo gusesengura ingufu zikwirakwiza ingufu (EDS).Ibiranga imiterere ya kristu yububiko bwa HEA byakozwe hakoreshejwe sisitemu yo gutandukanya X-ray (Bruker D2 icyiciro cyimura) ikoresheje isoko ya CuKα ifite intambwe ingana na 0.04 °.Ingaruka zimpinduka za microstructural kumiterere yubukanishi bwa HEA yibumbiye hamwe hakoreshejwe ibizamini bya microhardness ya Vickers hamwe na compression.Kubizamini byo gukomera, umutwaro wa 500 N ushyirwa kuri 15 s ukoresheje byibuze indentations 10 kuri buri cyitegererezo.Ibizamini byo guhunika ibice bya HEA mubushyuhe bwicyumba byakorewe ku ngero zurukiramende (7 mm × 3 mm × 3 mm) kuri Shimadzu 50KN imashini isuzuma isi yose (UTM) ku gipimo cyambere cya 0.001 / s.
Ibikoresho byinshi bya entropiya, nyuma yiswe ingero S-1 kugeza kuri S-6, byateguwe hongerwaho 3%, 6%, 9%, 12%, 15%, na 17% SiC (byose bifite uburemere%) kuri matrike ya CoCrFeNi .bikurikiranye.Icyitegererezo cyerekanwe kuri nta SiC yongeyeho ni icyitwa S-0.Micrografi nziza ya optique ya HEA yateye imbere irerekanwa mumashusho.1, aho, kubera kongeramo inyongeramusaruro zitandukanye, microstructure yicyiciro kimwe cya CoCrFeNi HEA yahinduwe microstructure igizwe nibice byinshi bifite morfologiya zitandukanye, ingano, nogukwirakwiza.Ingano ya SiC mubigize.Ingano ya buri cyiciro yagenwe uhereye kubisesengura ryamashusho ukoresheje software ya LAS Phase Impuguke.Kwinjiza ku gishushanyo cya 1 (hejuru iburyo) byerekana urugero rw'akarere kuri iri sesengura, kimwe n'igice cy'akarere kuri buri cyiciro.
Amashusho meza ya mikorobe yateye imbere cyane-entropiya: (a) C-1, (b) C-2, (c) C-3, (d) C-4, (e) C-5 na (f) C- 6.Inet yerekana urugero rwerekana itandukaniro rishingiye ku mashusho yo gusesengura ibisubizo ukoresheje porogaramu ya LAS Icyiciro cya Impuguke.
Nkuko bigaragara ku gishushanyo.1a, microstructure ya eutectic yakozwe hagati yubunini bwa matrix ya C-1 igizwe, aho ingano ya matrix na eutectic igereranijwe ni 87.9 ± 0.47% na 12.1% ± 0.51%.Muri compte (C-2) yerekanwe ku gishushanyo cya 1b, nta kimenyetso cyerekana reaction ya eutectic mugihe cyo gukomera, kandi microstructure itandukanye rwose niyya C-1 igizwe.Microstructure ya C-2 igizwe nibyiza kandi igizwe nibisahani bito (karbide) bigabanijwe kimwe mugice cya matrix (fcc).Ibice by'ibice bya matrix na karbide byagereranijwe kuri 72 ± 1,69% na 28 ± 1,69%.Usibye matrix na karbide, icyiciro gishya (siliside) cyabonetse muri C-3, nkuko bigaragara ku gishushanyo cya 1c, aho uduce duto twinshi twa siliside, karbide, na matrix tugera kuri 26.5% ± 0.41%, 25.9 ± 0.53, na 47,6 ± 0.34.Ikindi cyiciro gishya (grafite) nacyo cyagaragaye muri microstructure ya C-4 igizwe;ibyiciro bine byose byagaragaye.Icyiciro cya grafite gifite imiterere itandukanye yisi yose hamwe nigitandukanya cyijimye mumashusho ya optique kandi irahari gusa muke (agace kangana nigice kingana na 0,6 ± 0,30%).Mubihimbano C-5 na C-6, hamenyekanye ibyiciro bitatu gusa, kandi icyiciro cyijimye gitandukanya icyiciro cya grafite muri ibyo bice kigaragara muburyo bwa flake.Ugereranije na grafite ya flake muri Composite S-5, ibishushanyo bya grafite muri Composite S-6 ni binini, bigufi, kandi bisanzwe.Ubwiyongere bujyanye nibirimo grafite nabwo bwagaragaye kuva kuri 14.9 ± 0,85% muri C-5 kugeza kuri 17.4 ± 0.55% muri C-6.
Kugirango ukore iperereza rirambuye kuri microstructure hamwe nubumara bwa buri cyiciro murwego rwa HEA, hasuzumwe ingero hakoreshejwe SEM, hanyuma isesengura rya point ya EMF na mape ya chimique naryo ryakozwe.Ibisubizo byo guhuza C-1 byerekanwe mugitabo.2, aho kuba hari imvange ya eutectic itandukanya uturere twicyiciro cya matrix igaragara neza.Ikarita yimiti ya C-1 igizwe nishusho ya 2c, aho dushobora kubona ko Co, Fe, Ni, na Si bigabanijwe kimwe mugice cya matrix.Nyamara, umubare muto wa Cr wabonetse mugice cya matrix ugereranije nibindi bice bigize base HEA, byerekana ko Cr yakwirakwijwe muri matrix.Ibigize icyiciro cya eutectic cyera mumashusho ya SEM ikungahaye kuri chromium na karubone, byerekana ko ari karubide ya chromium.Kubura ibice bya SiC byihariye muri microstructure, bifatanije nibintu bigaragara bya chromium muri matrix no kuba hari imvange ya eutectic irimo ibice bikungahaye kuri chromium, byerekana kubora burundu kwa SiC mugihe cyo gushonga.Nkibisubizo byangirika bya SiC, silicon irashonga mugice cya matrix, kandi karubone yubusa ikorana na chromium kugirango ikore karubide ya chromium.Nkuko bigaragara, karubone yonyine niyo yagenwe muburyo bwa EMF, kandi ibyiciro byashizweho byemejwe no kumenya impinga ya karbide iranga X-ray itandukanya.
(a) SEM ishusho yicyitegererezo S-1, (b) ishusho nini, (c) ikarita yibintu, (d) ibisubizo bya EMF ahantu hagaragaye.
Isesengura ryibintu C-2 byerekanwe mubitini.3. Bisa nkibigaragara muri microscopi optique, isuzuma rya SEM ryerekanye imiterere myiza igizwe nibice bibiri gusa, hamwe nicyiciro cyoroshye cya lamellar cyagabanijwe muburyo bwose.icyiciro cya matrix, kandi nta cyiciro cya eutectic.Ikwirakwizwa ryibintu hamwe nisesengura rya EMF ryicyiciro cya lamellar ryagaragaje ibintu byinshi biri hejuru ya Cr (umuhondo) na C (icyatsi) muriki cyiciro, byongeye kwerekana kubora kwa SiC mugihe cyo gushonga no gukorana kwa karubone yarekuwe ningaruka za chromium .Matrix ya VEA ikora lamellar carbide icyiciro.Ikwirakwizwa ryibintu hamwe nisesengura ryicyiciro cya matrix ryerekanye ko ibyinshi muri cobalt, fer, nikel na silicon biboneka mugice cya matrix.
(a) SEM ishusho yicyitegererezo S-2, (b) ishusho nini, (c) ikarita yibintu, (d) ibisubizo bya EMF ahantu hagaragaye.
SEM ubushakashatsi bwakozwe na C-3 bwerekanye ko hariho ibyiciro bishya hiyongereyeho karbide na matrix.Ikarita yibanze (Isanamu 4c) hamwe nisesengura rya EMF (Ishusho 4d) yerekana ko icyiciro gishya gikungahaye kuri nikel, cobalt, na silikoni.
(a) SEM ishusho yicyitegererezo S-3, (b) ishusho nini, (c) ikarita yibintu, (d) ibisubizo bya EMF ahantu hagaragaye.
Ibisubizo bya SEM na EMF isesengura rya C-4 igizwe byerekanwe mubishushanyo.5. Usibye ibyiciro bitatu byagaragaye muri compte C-3, habonetse na node ya grafite.Igice cyijwi cyicyiciro gikungahaye kuri silikoni nacyo kiri hejuru yicyiza C-3.
(a) SEM ishusho yicyitegererezo S-4, (b) ishusho nini, (c) ikarita yibintu, (d) ibisubizo bya EMF ahantu hagaragaye.
Ibisubizo bya SEM na EMF byerekana ibice S-5 na S-6 byerekanwe mubishushanyo 1 na 2. 6 na 7.Usibye umubare muto wimibumbe, habonetse flake ya grafite nayo yagaragaye.Byombi umubare wibishushanyo bya grafite hamwe nubunini bwigice cya silikoni irimo icyiciro cya C-6 ni kinini kuruta muri C-5.
(a) SEM ishusho yicyitegererezo C-5, (b) kureba kwagutse, (c) ikarita yibanze, (d) ibisubizo bya EMF ahantu hagaragaye.
(a) SEM ishusho yicyitegererezo S-6, (b) ishusho nini, (c) ikarita yibintu, (d) ibisubizo bya EMF ahantu hagaragaye.
Imiterere ya Crystal iranga ibice bya HEA nayo yakozwe hakoreshejwe ibipimo bya XRD.Ibisubizo byerekanwe ku gishushanyo cya 8. Muburyo bwo gutandukanya shingiro WEA (S-0), gusa impinga ihuye nicyiciro cya fcc iragaragara.Uburyo bwo gutandukanya X-ray yibigize C-1, C-2, na C-3 byagaragaje ko hari impinga ziyongera zijyanye na karubide ya chromium (Cr7C3), kandi ubukana bwazo bwari hasi kuburugero C-3 na C-4, bwerekanaga ibyo kandi hamwe namakuru EMF kuri izi ngero.Impinga ihuye na silicide ya Co / Ni yagaragaye ku ngero S-3 na S-4, byongeye guhuza n'ibisubizo byo gushushanya ikarita ya EDS bigaragara ku gishushanyo cya 2 n'icya 3. Nkuko bigaragara ku gishushanyo cya 3 no ku gishushanyo cya 4. 5 na S-6 byagaragaye bihuye na grafite.
Byombi microstructural na crystallographic biranga ibice byateye imbere byerekanaga kubora kwa SiC yongeyeho.Ibi biterwa no kuba hari chromium muri matrike ya VEA.Chromium ifitanye isano cyane na karubone 54.55 kandi ikora hamwe na karubone yubusa kugirango ikore karbide, nkuko bigaragazwa no kugabanuka kwa chromium yibiri muri matrix.Si inyura mucyiciro cya fcc kubera gutandukana kwa SiC56.Kubwibyo, kwiyongera kwa SiC kuri base HEA byatumye habaho kwiyongera kwicyiciro cya karbide nubunini bwa Si kubuntu muri microstructure.Byagaragaye ko iyi Si yinyongera ishyirwa muri matrisa yibitekerezo bike (mubihimbano S-1 na S-2), mugihe murwego rwo hejuru (ibihimbano S-3 kugeza S-6) bivamo kwiyongera kwa cobalt /.nikel silicide.Ishyaka risanzwe ryo gushiraho Co na Ni silicide, byabonetse hakoreshejwe synthesis itaziguye yubushyuhe bwo hejuru, ni -37.9 ± 2.0, -49.3 ± 1.3, -34.9 ± 1.1 kJ mol -1 kuri Co2Si, CoSi na CoSi2, mugihe ibi indangagaciro ni - 50.6 ± 1.7 na - 45.1 ± 1.4 kJ mol-157 kuri Ni2Si na Ni5Si2.Indangagaciro ziri munsi yubushyuhe bwo gushinga SiC, byerekana ko gutandukana kwa SiC biganisha kumikorere ya silicide ya Co / Ni ari byiza cyane.Muri S-5 na S-6 byombi, silikoni yubusa yari ihari, yakiriwe birenze kurema siliside.Iyi silikoni yubusa yabonetse igira uruhare mugushushanya kugaragara mubyuma bisanzwe 58.
Imiterere yubukorikori bwa ceramic-yongerewe imbaraga yibikoresho bishingiye kuri HEA ikorwaho iperereza nibizamini byo kwikuramo no kugerageza gukomera.Imirongo-ihangayikishije umurongo wibintu byateye imbere byerekanwe mubishushanyo.9a, no ku gishushanyo cya 9b yerekana gutatanya hagati yimbaraga zumusaruro wihariye, imbaraga zitanga umusaruro, gukomera, no kurambura ibice byateye imbere.
.Menya ko gusa S-0 kugeza S-4 byerekanwe, nkurugero S-5 na S-6 zirimo inenge zikomeye zo gukina.
Nkuko bigaragara ku mutini.9, imbaraga z'umusaruro ziyongereye kuva kuri MPa 136 kuri base VES (C-0) igera kuri 2522 MPa kuri C-4.Ugereranije na WPP shingiro, S-2 igizwe yerekanye uburyo bwiza cyane bwo kunanirwa kunanirwa kwa 37%, kandi inerekana agaciro keza cyane k'umusaruro (1200 MPa).Ihuriro ryiza ryimbaraga nuguhindagurika kwibi bikoresho biterwa no kunoza microstructure muri rusange, harimo gukwirakwiza kimwe kwa karbide nziza ya lamellae muri microstructure yose, biteganijwe ko izabuza kwimuka.Imbaraga z'umusaruro wa C-3 na C-4 ni MPa 1925 na MP22 2522.Izi mbaraga zitanga umusaruro mwinshi zishobora gusobanurwa nigice kinini cyigice cya sima ya karbide na siliside.Ariko, kuba ibi byiciro nabyo byaviriyemo kurambura kuruhuka 7% gusa.Imirongo ihangayikishije umurongo wibice bigize CoCrFeNi HEA (S-0) na S-1 ni convex, byerekana ibikorwa byimpanga cyangwa TRIP59,60.Ugereranije nicyitegererezo S-1, umurongo-uhangayikishije umurongo wa S-2 ufite imiterere ihinnye kumurongo wa 10,20%, bivuze ko urupapuro rusanzwe rwa dislokisiyo aribwo buryo nyamukuru bwo guhindura ibintu muri iyi leta yahinduwe 60,61 .Nyamara, igipimo cyo gukomera muri iki kigereranyo gikomeza kuba hejuru hejuru y’urwego runini, kandi ku ntera yo hejuru ihinduka ryinjira mu bwumvikane naryo riragaragara (nubwo bidashobora guhakana ko ibyo biterwa no kunanirwa kwikorera imitwaro yo kwisiga).).Ibigize C-3 na C-4 bifite plastike nkeya gusa kuberako hari uduce twinshi twinshi twa karbide na siliside muri microstructure.Ibizamini byo guhunika byintangarugero C-5 na C-6 ntibyakozwe kubera inenge zikomeye zatewe kuri ziriya ngero (reba Ishusho 10).
Stereomicrographs yo guta inenge (yerekanwa n imyambi itukura) murugero rwibintu C-5 na C-6.
Ibisubizo byo gupima ubukana bwibigize VEA byerekanwe mubishushanyo.9b.Shingiro WEA ifite ubukana bwa 130 ± 5 HV, kandi ingero S-1, S-2, S-3 na S-4 zifite agaciro gakomeye ka 250 ± 10 HV, 275 ± 10 HV, 570 ± 20 HV na 755 ± 20 HV.Ubwiyongere bw'ubukomezi bwari bwumvikanye neza no guhindura imbaraga z'umusaruro zabonetse mu bizamini byo kwikuramo kandi byajyanye no kwiyongera k'ibikomeye muri compte.Ibiharuro byihariye byimbaraga zishingiye kubigenewe intego ya buri sample nayo irerekanwa mugitabo.9b.Muri rusange, uburyo bwiza bwo guhuza imbaraga (1200 MPa), gukomera (275 ± 10 HV), hamwe no kurambura ugereranije no gutsindwa (~ 37%) biragaragara kuri C-2.
Kugereranya imbaraga zumusaruro hamwe no kurambura ugereranije nibintu byateye imbere hamwe nibikoresho byibyiciro bitandukanye bigaragara kumashusho 11a.Ibigize bishingiye kuri CoCrFeNi muri ubu bushakashatsi byagaragaje kuramba cyane kurwego urwo arirwo rwose.Birashobora kandi kugaragara ko imitungo yibigize HEA yatejwe imbere muri ubu bushakashatsi iri mu karere katarimo abantu benshi mu kibanza cy’imbaraga zitanga umusaruro no kuramba.Mubyongeyeho, ibice byateye imbere bifite intera nini yo guhuza imbaraga (277 MPa, 1200 MPa, 1925 MPa na 2522 MPa) no kuramba (> 60%, 37%, 7.3% na 6.19%).Imbaraga zitanga umusaruro ningingo yingenzi muguhitamo ibikoresho byubuhanga buhanitse 63,64.Ni muri urwo rwego, HEA igizwe nubuvumbuzi bwa none irerekana uburyo bwiza bwo guhuza imbaraga no kuramba.Ibi ni ukubera ko kongeramo ubucucike buke SiC itanga ibisubizo hamwe nimbaraga zidasanzwe zumusaruro.Imbaraga zihariye zo gutanga umusaruro no kurambura ibice bya HEA biri murwego rumwe na HEA FCC hamwe na HEA yanga, nkuko bigaragara ku gishushanyo cya 11b.Ubukomezi nimbaraga zitanga imbaraga zateye imbere ziri murwego rumwe nikirahure kinini cyuma 65 (Ishusho 11c).Ibirahuri binini cyane (BMS) birangwa no gukomera no gutanga umusaruro, ariko kurambura kwayo ni 66,67.Nyamara, gukomera nimbaraga zitanga imbaraga za bimwe mubigize HEA byateye imbere murubu bushakashatsi nabyo byagaragaje kurambura gukomeye.Niyo mpamvu, hanzuwe ko ibihimbano byakozwe na VEA bifite umwihariko kandi ushakishwa nyuma yo guhuza imashini zikoreshwa muburyo butandukanye.Ihuriro ridasanzwe ryimiterere yubukanishi rishobora gusobanurwa no gukwirakwiza karbide zikomeye zakozwe mumwanya wa matrike ya FCC HEA.Ariko, nkigice cyintego yo kugera kuntego nziza yimbaraga, impinduka za microstructural zituruka ku kongeramo ibyiciro bya ceramic zigomba kwigwa neza no kugenzurwa kugirango wirinde guta inenge, nkibiboneka muri S-5 na S-6, na guhindagurika.uburinganire.
Ibyavuye muri ubu bushakashatsi byagereranijwe nibikoresho bitandukanye byubatswe hamwe na HEAs: (a) kurambura nimbaraga zitanga umusaruro62, (b) guhangayikishwa numusaruro wihariye no guhindagurika63 na (c) gutanga umusaruro nubukomezi65.
Microstructure hamwe nubukanishi bwurukurikirane rwibintu bya HEA-ceramic bishingiye kuri sisitemu ya HEA CoCrFeNi hiyongereyeho SiC byizwe kandi hafashwe imyanzuro ikurikira:
Ibikoresho byinshi bya entropie alloy birashobora gutezwa imbere wongeyeho SiC muri CoCrFeNi HEA ukoresheje uburyo bwo gushonga arc.
SiC ibora mugihe cyo gushonga kwa arc, biganisha kumiterere ya karbide, siliside na grafite ya fite, kuba hamwe nubunini bwabyo biva kumubare wa SiC wongeyeho kuri base HEA.
HEA igizwe nibintu byinshi byiza byubukanishi, hamwe nibintu bigwa mubice bitarimo abantu ku mbaraga zumusaruro hamwe no kurambura.Imbaraga zitanga umusaruro wa HEA yakozwe ikoresheje 6 wt% SiC yikubye inshuro zirenga umunani iy'ibanze HEA mugihe ikomeza guhindagurika 37%.
Gukomera no gutanga umusaruro wibigize HEA biri murwego rwibirahuri byinshi byuma (BMG).
Ibyavuye mu bushakashatsi byerekana ko ibinyabuzima byinshi-entropiya bivanze byerekana uburyo butanga ikizere cyo kugera ku buryo bwiza bwo guhuza ibyuma-imashini zikoreshwa mu buryo bunoze.
Igihe cyo kohereza: Nyakanga-12-2023