Indentation size effect in metallic glasses: Mean pressure at the initiation of plastic flow

JOURNAL OF ALLOYS AND COMPOUNDS

卷:615

Article; Proceedings Paper

Nachum, S.¹  Greer, A. L.^1,2 

[1] Univ Cambridge, Dept Mat Sci & Met, Cambridge CB3 0FS, England

[2] Tohoku Univ, WPI Adv Inst Mat Res, Sendai, Miyagi 9808577, Japan

关键词: Metallic glasses;    Mechanical properties;    Nanoindentation;    Plastic yielding;    Shear band;   

DOI  :  10.1016/j.jallcom.2013.12.058

来源: Elsevier

【 摘 要 】

Nanoindentation tests using a spherical indenter of tip radius 10 mu m have been performed on Zr- and Pd-based metallic glasses, focusing on the cumulative distribution of the first yield load. When normalized using the macroscopic yield stress, the distribution of mean pressure at yield is nearly independent of the glass composition. Collecting literature data, there is a clear indentation size effect in metallic glasses: the smaller the indenter tip radius, the larger the indentation pressure at yield. The magnitude of the size effect in metallic glasses is compared with, and found to lie between, the cases of crystalline metals and ceramics. (C) 2014 The Authors. Published by Elsevier B.V. All rights reserved.

【 授权许可】

Free