High strain rate sensitivity of hardness in Ti-Zr-Hf-Be-(Cu/Ni) high entropy bulk metallic glasses

被引：21

作者：

Zhao, Shaofan ^{[1
]}

Wang, Haibin ^{[2
]}

Gu, Jialun ^{[3
]}

Guo, Nan ^{[1
]}

Shao, Ling ^{[4
]}

Zhang, Yingqi ^{[3
]}

Yao, Kefu ^{[3
]}

Chen, Na ^{[3
,5
]}

机构：

[1] Qian Xuesen Lab Space Technol, Beijing 100094, Peoples R China

[2] Beijing Univ Technol, Educ Minist China, Key Lab Adv Funct Mat, Coll Mat Sci & Engn, Beijing 100124, Peoples R China

[3] Tsinghua Univ, Sch Mat Sci & Engn, Beijing 100084, Peoples R China

[4] Beihang Univ, Sch Mat Sci & Engn, Beijing 100191, Peoples R China

[5] Minist Educ, Key Lab Adv Mat Proc Technol, Beijing, Peoples R China

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2018年 / 742卷

基金：

中国国家自然科学基金;

关键词：

High entropy bulk metallic glasses; Nanoindentation; Strain rate sensitivity; CREEP-BEHAVIOR; NANOINDENTATION; FLOW; DEFORMATION; ALLOYS; INDENTATION; PLASTICITY;

D O I：

10.1016/j.jallcom.2018.01.264

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Nanoindentation tests on the Ti20Zr20Hf20Be20(Cu20-xNix) (x = 0, 12.5, 20 at.%) high entropy bulk metallic glasses (HE-BMGs) indicate both their average hardness and moduli show a significant loading strain rate-dependent behaviour. In special, the strain rate sensitivity of hardness measured for the prepared TiZrHfBeNi HE-BMG is up to 0.056 which is the highest value reported for BMGs so far. Such high strain rate sensitivity of hardness is likely due to the high-entropy effect, which makes the amorphous structure more homogeneous. In addition, the high entropy coupled with amorphous structure manifests as small shear transformation zone (STZ) volumes that could make the shear bands hard to be initiated. (c) 2018 Elsevier B.V. All rights reserved.

引用

页码：312 / 317

页数：6

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