Single shear-band plasticity in a bulk metallic glass at cryogenic temperatures

SCRIPTA MATERIALIA

卷:66

Article

Maass, R.¹  Klaumuenzer, D.¹  Preiss, E. I.¹  Derlet, P. M.²  Loeffler, J. F.¹ 

[1] Swiss Fed Inst Technol, Dept Mat, Lab Met Phys & Technol, CH-8093 Zurich, Switzerland

[2] Paul Scherrer Inst, CH-5232 Villigen, Switzerland

关键词: Metallic glass;    Plasticity;    Low temperature;    Shear band;   

DOI  :  10.1016/j.scriptamat.2011.10.044

来源: Elsevier

【 摘 要 】

At cryogenic temperatures bulk metallic glasses can sustain higher plastic strains than at room temperature. This is generally believed to result from an intrinsic shear-band nucleation rate that increases with decreasing temperature. Here we report on inhomogeneous flow operating via a single shear band even at cryogenic temperatures, challenging the presupposition of increased shear-band activity. The results provide a new interpretation of non-serrated flow and explain, via a simple viscosity law, the correspondingly observed strength increase with decreasing temperature. (C) 2011 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

【 授权许可】

Free