Activation energy for plastic flow in nanocrystalline CoCrFeMnNi high-entropy alloy: A high temperature nanoindentation study

被引：52

作者：

Lee, Dong-Hyun ^{[1
]}

Choi, In-Chul ^{[2
]}

Yang, Guanghui ^{[1
]}

Lu, Zhaoping ^{[3
]}

Kawasaki, Megumi ^{[4
]}

Ramamurty, Upadrasta ^{[5
]}

Schwaiger, Ruth ^{[2
]}

Jang, Jae-il ^{[1
]}

机构：

[1] Hanyang Univ, Div Mat Sci & Engn, Seoul 04763, South Korea

[2] Karlsruhe Inst Technol, Inst Appl Mat, D-76344 Karlsruhe, Germany

[3] Univ Sci & Technol Beijing, State Key Lab Advance Met & Mat, Beijing 10083, Peoples R China

[4] Oregon State Univ, Sch Mech Ind & Mfg Engn, Corvallis, OR 97331 USA

[5] Nanyang Technol Univ, Sch Mech & Aerosp Engn, Singapore 639798, Singapore

来源：

SCRIPTA MATERIALIA | 2018年 / 156卷

基金：

新加坡国家研究基金会;

关键词：

High-entropy alloy; Nanoindentation; Activation energy barrier; Nanocrystalline metal; MECHANICAL-PROPERTIES; RATE SENSITIVITY; BEHAVIOR; DEFORMATION; STABILITY; DEPENDENCE; HARDNESS; VOLUME; CREEP; LOAD;

D O I：

10.1016/j.scriptamat.2018.07.014

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Nanoindentation experiments in the temperature (7) range of 298 and 573 K were performed to determine the activation energy (Q) for the plastic flow in a nanocrystalline CoCrFeMnNi high-entropy alloy, which was synthesized using high-pressure torsion. A marked increase in Q from similar to 0.5 to similar to 1.8 eV was observed when T is increased from 473 to 523 K, which correspond to similar to 0.3 and similar to 0.34 T-m (T-m: melting temperature), respectively. Detailed analysis reveals that this transition is associated with the additional activation of the grain boundary diffusion mechanism in enhancing plasticity. (C) 2018 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：129 / 133

页数：5

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