面心立方结构高/中熵合金中霍尔-佩奇关系与晶粒生长动力学的研究

A Study on the Hall-Petch Relationship and Grain Growth Kinetics in FCC-Structured High/Medium Entropy Alloys.

作者信息

Huang Yung-Chien, Su Che-Hsuan, Wu Shyi-Kaan, Lin Chieh

机构信息

Department of Materials Science and Engineering, National Taiwan University, Taipei 106, Taiwan.

Department of Mechanical Engineering, National Taiwan University, Taipei 106, Taiwan.

出版信息

Entropy (Basel). 2019 Mar 19;21(3):297. doi: 10.3390/e21030297.

DOI:10.3390/e21030297

PMID:33267012

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC7514778/

Abstract

The recrystallization behavior, grain growth kinetics, and corresponding hardness variation of homogenized and 80% cold-rolled FeCoNiCrPd, FeCoNiCrMn, and their quaternary/ternary FCC-structured high/medium entropy alloys (H/MEAs) annealed under different conditions were investigated. Experimental results indicate that the grain size and hardness of these H/MEAs follow the Hall-Petch equation, with the Hall-Petch coefficient value being mainly dominated by the alloy's stacking fault energy and shear modulus. The FeCoNiCrPd alloy exhibits the highest hardness of the H/MEAs at the same grain size due to the largest Young's modulus difference between Cr and Pd. The grain growth exponent , kinetic constant , and activation energy for grain growth of all H/MEAs are calculated. The can be expressed by the Arrhenius equation with , which is attributed to the diffusion rate. The results demonstrate that the values of these H/MEAs are much higher than those of conventional alloys; most notable is FeCoNiCrPd HEA, which has an unusually lattice distortion effect that hinders grain growth.

摘要

研究了在不同条件下退火的均匀化和80%冷轧的FeCoNiCrPd、FeCoNiCrMn及其四元/三元面心立方结构的高/中熵合金（H/MEA）的再结晶行为、晶粒生长动力学以及相应的硬度变化。实验结果表明，这些H/MEA的晶粒尺寸和硬度遵循霍尔-佩奇方程，霍尔-佩奇系数值主要由合金的堆垛层错能和剪切模量决定。由于Cr和Pd之间的杨氏模量差异最大，FeCoNiCrPd合金在相同晶粒尺寸下表现出H/MEA中最高的硬度。计算了所有H/MEA的晶粒生长指数、动力学常数和晶粒生长激活能。可以用阿累尼乌斯方程表示，其中归因于扩散速率。结果表明，这些H/MEA的值远高于传统合金；最显著的是FeCoNiCrPd高熵合金，其具有异常的晶格畸变效应，阻碍了晶粒生长。