Liquid-phase separation in undercooled CoCrCuFeNi high entropy alloy

被引：36
作者：
Guo, Tong [1 ]
Li, Jinshan [1 ]
Wang, Jun [1 ]
Wang, Yi [1 ]
Kou, Hongchao [1 ]
Niu, Sizhe [1 ]
机构：
[1] Northwestern Polytech Univ, State Key Lab Solidificat Proc, Xian 710072, Shaanxi, Peoples R China
来源：
INTERMETALLICS | 2017年 / 86卷
关键词：
High entropy alloy; Liquid-phase separation; Microstructure evolution; Critical undercooling; CU-CO-FE; MECHANICAL-PROPERTIES; RAPID SOLIDIFICATION; MISCIBILITY GAP; BEHAVIOR; MICROSTRUCTURE; IMMISCIBILITY; SYSTEMS; MELTS;
D O I：
10.1016/j.intermet.2017.03.021
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Liquid-phase separation in a CoCrCuFeNi high entropy alloy is evidenced by supercooling method. The CoCrCuFeNi high entropy alloy is supercooled by glass fluxing method with a sample mass about 100 g which allows tensile test at different undercoolings. The microstructure evolution of CoCrCuFeNi high entropy alloy solidified at different undercoolings are investigated. The variation of interdendritic Cu-rich phase and the hardness of the dendrites are described in detail and liquid-phase separation is confirmed to have taken place when undercooling is equal or greater than 100 K. The plasticity and elastic modulus during tensile tests are strongly affected by compositional change upon liquid-phase separation. The samples solidified after liquid-phase separation exhibit much higher plasticity and lower elastic modulus. (C) 2017 Elsevier Ltd. All rights reserved.
引用
收藏
页码：110 / 115
页数：6
相关论文
共 36 条
[1]   Microstructural development in equiatomic multicomponent alloys [J].
Cantor, B ;
Chang, ITH ;
Knight, P ;
Vincent, AJB .
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 2004, 375 :213-218
[2]   Rapid solidification of bulk undercooled hypoperitectic Fe-Cu alloy [J].
Chen, Y. Z. ;
Liu, F. ;
Yang, G. C. ;
Xu, X. Q. ;
Zhou, Y. H. .
JOURNAL OF ALLOYS AND COMPOUNDS, 2007, 427 (1-2) :L1-L5
[3]   Microstructure and wear behavior of AlxCo1.5CrFeNi1.5Tiy high-entropy alloys [J].
Chuang, Ming-Hao ;
Tsai, Ming-Hung ;
Wang, Woei-Ren ;
Lin, Su-Jien ;
Yeh, Jien-Wei .
ACTA MATERIALIA, 2011, 59 (16) :6308-6317
[4]   The liquid metastable miscibility gap in Cu-based systems [J].
Curiotto, S. ;
Greco, R. ;
Pryds, N. H. ;
Johnson, E. ;
Battezzati, L. .
FLUID PHASE EQUILIBRIA, 2007, 256 (1-2) :132-136
[5]   Liquid phase separation in immiscible Ag-Ni-Nb alloy and formation of crystalline/amorphous composite [J].
He, Jie ;
Jiang, Hongxiang ;
Chen, Shu ;
Zhao, Jiuzhou ;
Zhao, Lei .
JOURNAL OF NON-CRYSTALLINE SOLIDS, 2011, 357 (21) :3561-3564
[6]   Preparation of phase-separated textures and crystalline phases from two-liquid immiscible melts in the TiO2-SiO2 system [J].
Katsumata, KI ;
Kameshima, Y ;
Okada, K ;
Yasumori, A .
MATERIALS RESEARCH BULLETIN, 2004, 39 (7-8) :1131-1139
[7]   The metastable liquid miscibility gap in Cu-Co-Fe alloys [J].
Kim, DI ;
Abbaschian, R .
JOURNAL OF PHASE EQUILIBRIA, 2000, 21 (01) :25-31
[8]   Enhanced mechanical properties of a CoCrFeNi high entropy alloy by supercooling method [J].
Li, Jinshan ;
Jia, Wenjuan ;
Wang, Jun ;
Kou, Hongchao ;
Zhang, Dong ;
Beaugnon, Eric .
MATERIALS & DESIGN, 2016, 95 :183-187
[9]   Metastable high-entropy dual-phase alloys overcome the strength-ductility trade-off [J].
Li, Zhiming ;
Pradeep, Konda Gokuldoss ;
Deng, Yun ;
Raabe, Dierk ;
Tasan, Cemal Cem .
NATURE, 2016, 534 (7606) :227-+
[10]  
Lim XZ, 2016, NATURE, V533, P306, DOI 10.1038/533306a
1234