Effect of low temperature on tensile properties of AlCoCrFeNi2.1 eutectic high entropy alloy

被引：123

作者：

Bhattacharjee, Tilak ^{[1
,2
]}

Zheng, Ruixiao ^{[1
]}

Chong, Yan ^{[1
]}

Sheikh, Saad ^{[3
]}

Guo, Sheng ^{[3
]}

Clark, Ian Thomas ^{[4
]}

Okawa, Toshiro ^{[4
]}

Wani, Irfan Samad ^{[5
]}

Bhattacharjee, Pinaki Prasad ^{[5
]}

Shibata, Akinobu ^{[1
,2
]}

Tsuji, Nobuhiro ^{[1
,2
]}

机构：

[1] Kyoto Univ, Dept Mat Sci & Engn, Sakyo Ku, Yoshida Honmachi, Kyoto 6068501, Japan

[2] Kyoto Univ, ESISM, Sakyo Ku, Yoshida Honmachi, Kyoto 6068501, Japan

[3] Chalmers Univ Technol, Mat & Mfg Technol, SE-41296 Gothenburg, Sweden

[4] Scienta Omicron Inc, Shinagawa Ku, 6-16-4 Minami Oi, Tokyo 1400013, Japan

[5] IIT Hyderabad, Dept Mat Sci & Met Engn, Hyderabad, Andhra Prades, India

来源：

MATERIALS CHEMISTRY AND PHYSICS | 2018年 / 210卷

基金：

瑞典研究理事会;

关键词：

Eutectic high entropy alloy; Low temperature tensile test; Nanoindentation; TEM; MECHANICAL-PROPERTIES; STRENGTH; FCC;

D O I：

10.1016/j.matchemphys.2017.06.023

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The effect of low temperature on tensile properties of a AlCoCrFeNi2.1 eutectic high entropy alloy (EHEA) was investigated in the present work. Transmission electron microscopy (TEM) showed that the initial as-cast microstructure consisted of B2 (ordered body centered cubic structure) and L1(2) (ordered face centered cubic structure) phases. Upon tensile testing at temperatures ranging from room temperature (RT) to -196 degrees C (77 K), the L1(2) phase became disordered, changing to a simple FCC (face centered cubic) crystal structure whereas the B2 phase maintained an ordered structure. An increase over 300 MPa was observed in the ultimate tensile strength (ours) of the -196 degrees C tensile tested sample compared to the room temperature tensile tested sample, while keeping almost similar amount of total elongation. TEM results indicated an increase in the dislocation activity in the FCC phase as well as B2 phase in the -196 degrees C tensile tested sample compared to the sample deformed at room temperature. (C) 2017 Elsevier B.V. All rights reserved.

引用

页码：207 / 212

页数：6

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