Activation energy for plastic flow in nanocrystalline CoCrFeMnNi high-entropy alloy: A high temperature nanoindentation study
Activation energy for plastic flow in nanocrystalline CoCrFeMnNi high-entropy alloy: A high temperature nanoindentation study
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DOI：
10.1016/j.scriptamat.2018.07.014
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发表时间：
2018-11-01
影响因子：
6
通讯作者：
Jang, Jae-il
中科院分区：
文献类型：
--
作者：
Lee, Dong-Hyun;Choi, In-Chul;Jang, Jae-il
在 298 和 573 K 的温度 (7) 范围内进行纳米压痕实验，以确定使用高压扭转合成的纳米晶 CoCrFeMnNi 高熵合金中塑性流动的活化能 (Q)。当 T 从 473 K 增加到 523 K 时，观察到 Q 从大约 0.5 eV 显着增加到大约 1.8 eV，分别对应于大约 0.3 和大约 0.34 T-m（T-m：熔化温度）。详细分析表明，这种转变与晶界扩散机制在增强塑性方面的额外激活有关。 (C) 2018 Acta Materialia Inc. 由 Elsevier Ltd 出版。保留所有权利。
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.