Ductile CoCrFeNiMox high entropy alloys strengthened by hard intermetallic phases

被引：826
作者：
Liu, W. H. [1 ]
Lu, Z. P. [2 ]
He, J. Y. [2 ]
Luan, J. H. [1 ]
Wang, Z. J. [3 ]
Liu, B. [4 ]
Liu, Yong [4 ]
Chen, M. W. [5 ]
Liu, C. T. [1 ]
机构：
[1] City Univ Hong Kong, Dept Mech & Biomed Engn, Ctr Adv Struct Mat, Hong Kong, Hong Kong, Peoples R China
[2] Univ Sci & Technol Beijing, State Key Lab Adv Met & Mat, Beijing 10083, Peoples R China
[3] Northwestern Polytech Univ, State Key Lab Solidificat Proc, Xian 710072, Peoples R China
[4] Cent South Univ, State Key Lab Powder Met, Changsha 410083, Hunan, Peoples R China
[5] Tohoku Univ, WPI Adv Inst Mat Res, Sendai, Miyagi 9808577, Japan
来源：
ACTA MATERIALIA | 2016年 / 116卷
关键词：
High entropy alloys; Precipitation hardening; Crack propagation; Intermetallic phase; Strain hardening; STRAIN-HARDENING REGIMES; STACKING-FAULT ENERGY; MECHANICAL-PROPERTIES; DEFORMATION-BEHAVIOR; DIFFRACTION; MICROSTRUCTURE; PRECIPITATION; COMPRESSION; EVOLUTION; STEEL;
D O I：
10.1016/j.actamat.2016.06.063
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Face-centered-cubic (fcc) type high entropy alloys (HEAs) exhibit outstanding ductility even at the liquid nitrogen temperature, but they are relatively weak in strength which is far from the requirements for practical structural applications. One of the general concepts employed previously in alloy design is the suppression of 'brittle' intermetallic compound formation which usually leads to a serious embrittlement. Surprisingly, we reveal in this study that the precipitation of hard a and intermetallic compounds tremendously strengthened the CoCrFeNiMo0.3 HEA but without causing a serious embrittlement It exhibits a tensile strength as high as 1.2 GPa and a good ductility of similar to 19%. A careful study of the deformation behavior reveals that the fcc matrix exhibits an extremely high work hardening exponent of 0.75, which suppresses the propagation of microcracks originated at these brittle particles. Our work presents a very successful demonstration of using complex hard intermetallic particles to manipulate the properties of fcc-type HEA systems. Furthermore, lattice distortion has been carefully measured in powder-metallurgy materials by line broadening from X-ray diffraction (XRD). It is interesting to discover that lattice planes are highly distorted in HEM and this distortion also contributes to solid solution hardening. (C) 2016 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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页码：332 / 342
页数：11
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