Testing effects on hardness of a Zr-based metallic glass under nanoindentation

SCRIPTA MATERIALIA

卷:138

Article

Li, M. C.¹  Jiang, M. Q.^2,3  Jiang, F.¹  He, L.¹  Sun, J.¹ 

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

[2] Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China

[3] Univ Chinese Acad Sci, Sch Engn Sci, Beijing 100049, Peoples R China

关键词: Metallic glass;    Nanoindentation;    Strain rate;    Indentation size effect;   

DOI  :  10.1016/j.scriptamat.2017.05.046

来源: Elsevier

【 摘 要 】

A series of nanoindentation tests were performed on a Zr-based bulk metallic glass at different peak-loads and strain rates. It is observed that the strain rate sensitivity index gradually decreases from positive to almost zero with increasing peak-load. Furthermore, at a fixed strain rate, the indentation hardness firstly shows a dramatic reduction and then becomes stable with increasing peak-load. These observations can be well understood in the framework of the activation and the accumulation of free volume via shear transformation zones. The current work may provide a practical way to tailor the hardness of the metallic glass. (C) 2017 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

【 授权许可】

Free