Microstructure and tensile behaviors of FCC Al0.3CoCrFeNi high entropy alloy

被引：310
作者：
Shun, Tao-Tsung [1 ]
Du, Yu-Chin [1 ]
机构：
[1] Feng Chia Univ, Dept Mat Sci & Engn, Taichung 407, Taiwan
来源：
JOURNAL OF ALLOYS AND COMPOUNDS | 2009年 / 479卷 / 1-2期
关键词：
Casting; Precipitation; Scanning and transmission electron microscopy; Strain; CO; SYSTEM;
D O I：
10.1016/j.jallcom.2008.12.088
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：
Homogeneously spherical nanoprecipitates with a L1(2) ordered structure are observed in as-cast FCC Al0.3CoCrFeNi high entropy alloy, while their morphology changes to platelets after aging at 700 degrees C. The appearance of a yield drop and low work-hardening during tension reveals that these nanoprecipitates are coherent and have the characteristics of the Guinier-Preston zone. The 900 degrees C aged alloy displays micro-sized rod-shaped precipitates rich in Ni and Al instead of nanoprecipitates. There is no yield drop but high work-hardening occurs during tension. This rod-shaped phase has a B2 ordered structure and has the Kurdiumov-Sachs relationship with the FCC matrix. (c) 2008 Elsevier B.V. All rights reserved,
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页码：157 / 160
页数：4
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