New evidences for understanding the serrated flow and shear band behavior in nanoindentation of metallic glasses

JOURNAL OF ALLOYS AND COMPOUNDS

卷:857

Article

Huang, Hu^1,2  Jiang, Minqiang^3,4  Yan, Jiwang² 

[1] Jilin Univ, Sch Mech & Aerosp Engn, Key Lab CNC Equipment Reliabil, Minist Educ, Changchun 130022, Jilin, Peoples R China

[2] Keio Univ, Fac Sci & Technol, Dept Mech Engn, Yokohama, Kanagawa 2238522, Japan

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

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

关键词: Nanoindentation;    Bulk metallic glass;    Shear band;    Serrated flow;   

DOI  :  10.1016/j.jallcom.2020.157587

来源: Elsevier

【 摘 要 】

Nanoindentation of a Zr-based metallic glass was performed under various loading rates by using a cube-corner indenter. Experimental results showed that increasing the loading rate from 2 to 20 mN/s, the size of serrated flow was greatly weakened, but the number of serrated flow kept very stable, together with very similar shear band features around the residual indents. These results challenge the current understanding derived from the results obtained by using the Berkovich indenter, and can be well explained by the shear-band propagation dynamics model, i.e., loading rate impeded the propagation of shear band rather than its nucleation. (C) 2020 Elsevier B.V. All rights reserved.

【 授权许可】

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