Nanoindentation avalanches and dislocation structures in HfNbTiZr high entropy alloy

被引：15

作者：

Yin, Yu-Zhen ^{[1
]}

Lu, Yan ^{[1
]}

Zhang, Tai-Ping ^{[2
]}

Han, Wei-Zhong ^{[1
]}

机构：

[1] Xi An Jiao Tong Univ, Ctr Adv Mat Performance Nanoscale, State Key Lab Mech Behav Mat, Xian 710049, Peoples R China

[2] North China Univ Water Resources & Elect Power, Sch Mat Sci & Engn, Zhengzhou 450045, Peoples R China

来源：

SCRIPTA MATERIALIA | 2023年 / 227卷

基金：

中国国家自然科学基金;

关键词：

High entropy alloy; Nanoindentation; Avalanche; Dislocation; Mobility; CENTERED-CUBIC METALS; INCIPIENT PLASTICITY; SCREW DISLOCATIONS; DEFORMATION; NUCLEATION; DUCTILE; OXYGEN;

D O I：

10.1016/j.scriptamat.2023.115312

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

High temperature nanoindentation was performed on a refractory HfNbTiZr high-entropy alloy to probe the unique dislocation behaviors. Anomalous nanoindenation avalanche occurs once the load reaches a critical value of 10 mN and exceeds the elastic limit of the alloy. The depth of the plastic zone under indentation is much deeper in the sample with avalanches, and continues to deepen with the increase of testing temperature. A large fraction of mixed dislocations is formed after nanoindentation, instead of forming the long screw dislocations as in common refractory metals. Nanoindentation avalanche is induced by the sudden movement of a group of usually sluggish dislocations, which have a low mobility due to local chemical fluctuations and large lattice distortions. These results manifest a weak temperature-dependence of dislocation mobility in body-centered cubic high-entropy alloy.

引用

页数：5

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