Design of novel AlCoFeNiV high-entropy alloys with high-strength and high-ductility - 文章详情页

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摘要：

Eutectic　high-entropy　alloys　(EHEAs)　are　gaining　interest　due　to　their　excellent　mechanical　properties,　superior　liquidity　and　castability,　and　reduced　compositional　segregation.　Here,　we　developed　and　successfully　prepared　Al19Co23Fe21Ni37　EHEA　using　vacuum　arc　melting.　By　adjusting　the　Co　content　and　introducing　V,　we　also　obtained　near-eutectic　high　entropy　alloys　(Al18Co27Fe20Ni35　and　Al18Co22Fe20Ni35V5).　The　Al19Co23Fe21Ni37　and　Al18Co27Fe20Ni35　alloys　consist　of　alternating　face-centered　cubic　(FCC)　and　ordered　body-centered　cubic　(B2)　phases,　whereas　the　Al18Co22Fe20Ni35V5　alloy　consists　of　FCC,　ordered　face-centered　cubic　(L12)　and　B2　phases.　The　heterostructure　not　only　restricts　dislocation　motion　but　also　induces　significant　hetero-deformation-induced　hardening,　resulting　in　a　high-strain　hardening　effect.　Furthermore,　the　high　volume　fraction　of　the　hard　B2　phase　contributes　to　the　increased　strength　of　the　alloy　due　to　its　high-stress　partition　relative　to　the　other　phases.　As　such,　Al18Co22Fe20Ni35V5　alloy　exhibits　an　excellent　tensile　ductility　of　16.1%,　yield　strength　of　571　MPa,　and　ultimate　tensile　strength　of　1157　MPa.

关键词：

Mechanical properties Heterostructure Hetero-deformation-induced (HDI) hardening Eutectic high-entropy alloys

作者机构：

[ 1 ] [Wang, Xin]Beijing Univ Technol, Fac Mat & Mfg, Beijing Key Lab Microstruct & Property Adv Mat, Beijing 100124, Peoples R China
[ 2 ] [An, Zibing]Beijing Univ Technol, Fac Mat & Mfg, Beijing Key Lab Microstruct & Property Adv Mat, Beijing 100124, Peoples R China
[ 3 ] [Cai, Jixiang]Beijing Univ Technol, Fac Mat & Mfg, Beijing Key Lab Microstruct & Property Adv Mat, Beijing 100124, Peoples R China
[ 4 ] [Jiang, Cheng]Beijing Univ Technol, Fac Mat & Mfg, Beijing Key Lab Microstruct & Property Adv Mat, Beijing 100124, Peoples R China
[ 5 ] [Su, Honghong]Beijing Univ Technol, Fac Mat & Mfg, Beijing Key Lab Microstruct & Property Adv Mat, Beijing 100124, Peoples R China
[ 6 ] [Luo, Xianmin]Beijing Univ Technol, Fac Mat & Mfg, Beijing Key Lab Microstruct & Property Adv Mat, Beijing 100124, Peoples R China
[ 7 ] [Li, Ziyao]Beijing Univ Technol, Fac Mat & Mfg, Beijing Key Lab Microstruct & Property Adv Mat, Beijing 100124, Peoples R China
[ 8 ] [Wu, Shichang]Beijing Univ Technol, Fac Mat & Mfg, Beijing Key Lab Microstruct & Property Adv Mat, Beijing 100124, Peoples R China
[ 9 ] [Yang, Luyan]Beijing Univ Technol, Fac Mat & Mfg, Beijing Key Lab Microstruct & Property Adv Mat, Beijing 100124, Peoples R China
[ 10 ] [Long, Haibo]Beijing Univ Technol, Fac Mat & Mfg, Beijing Key Lab Microstruct & Property Adv Mat, Beijing 100124, Peoples R China
[ 11 ] [Mao, Shengcheng]Beijing Univ Technol, Fac Mat & Mfg, Beijing Key Lab Microstruct & Property Adv Mat, Beijing 100124, Peoples R China
[ 12 ] [Zhang, Ze]Beijing Univ Technol, Fac Mat & Mfg, Beijing Key Lab Microstruct & Property Adv Mat, Beijing 100124, Peoples R China
[ 13 ] [Han, Xiaodong]Beijing Univ Technol, Fac Mat & Mfg, Beijing Key Lab Microstruct & Property Adv Mat, Beijing 100124, Peoples R China
[ 14 ] [Zhang, Jianfei]Beijing Univ Technol, Fac Informat Technol, Beijing 100124, Peoples R China
[ 15 ] [Zhang, Ze]Zhejiang Univ, Ctr Electron Microscopy, Sch Mat Sci & Engn, State Key Lab Silicon Mat, Hangzhou 310058, Peoples R China

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zban@bjut.edu.cn |
scmao@bjut.edu.cn |
xdhan@bjut.edu.cn

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