Strengthening of a CrMnFeCoNi high-entropy alloy by carbide precipitation

被引：108
作者：
Gao, N. [1 ]
Lu, D. H. [1 ]
Zhao, Y. Y. [2 ]
Liu, X. W. [1 ,3 ]
Liu, G. H. [4 ]
Wu, Y. [3 ]
Liu, G. [5 ]
Fan, Z. T. [1 ]
Lu, Z. P. [3 ]
George, E. P. [2 ,6 ]
机构：
[1] Huazhong Univ Sci & Technol, State Key Lab Mat Proc & Die & Mould Technol, Wuhan 430074, Hubei, Peoples R China
[2] Univ Tennessee, Dept Mat Sci & Engn, Knoxville, TN 37996 USA
[3] Univ Sci & Technol Beijing, State Key Lab Adv Met & Mat, Beijing 100083, Peoples R China
[4] Northeastern Univ, State Key Lab Rolling & Automat, Shenyang 110819, Liaoning, Peoples R China
[5] Xian Univ Technol, Sch Mat Sci & Engn, Xian 710048, Shaanxi, Peoples R China
[6] Oak Ridge Natl Lab, Mat Sci & Technol Div, Oak Ridge, TN USA
来源：
JOURNAL OF ALLOYS AND COMPOUNDS | 2019年 / 792卷
基金：
中国国家自然科学基金;
关键词：
High-entropy alloy; Carbide; Precipitation; Tensile property; Strengthening; MECHANICAL-PROPERTIES; MICROSTRUCTURAL EVOLUTION; ELASTIC-MODULI; DEFORMATION MECHANISMS; TENSILE PROPERTIES; THERMAL-STABILITY; PHASE-STABILITY; CARBON CONTENT; GRAIN-GROWTH; PLASTICITY;
D O I：
10.1016/j.jallcom.2019.04.121
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：
The equiatomic CrMnFeCoNi high-entropy alloy (HEA) exhibits outstanding toughness and excellent strength-ductility combination at cryogenic temperatures. However, its strength is relatively low at room temperature. In order to strengthen this HEA, microalloying additions of 0.8 at.% Nb and C were made and its properties and microstructure evaluated. It was found that the microalloying resulted in the formation of carbide precipitates and a reduction of the grain size to similar to 2.6 mu m. As a result, the room-temperature tensile yield strength (732 MPa) of the microalloyed HEA is roughly double that of the base HEA (with a concomitant increase in the ultimate strength) while its ductility is maintained at a relatively high level (elongation to fracture of similar to 32%). The strengthening is due to precipitation hardening from the nanoscale carbide particles and grain refinement. Crown Copyright (C) 2019 Published by Elsevier B.V. All rights reserved.
引用
收藏
页码：1028 / 1035
页数：8
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