Plasticity and damage in cellular amorphous metals

被引:75
作者
Brothers, AH [1 ]
Dunand, DC [1 ]
机构
[1] Northwestern Univ, Dept Mat Sci & Engn, Evanston, IL 60208 USA
关键词
metallic glasses; foams; Vit106; mechanical properties; shear bands;
D O I
10.1016/j.actamat.2005.06.002
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Compressive mechanical properties of low-density, open-cell Zr-based bulk metallic glass foams processed by the salt replication method are investigated as a function of relative density and pore size in the ranges 14-28% and 150-355 mu m, respectively. Scaling behaviors for strength and stiffness are discussed in the context of models developed for conventional metal foams, and appropriate modifications presented where necessary. Deformation and damage features not addressed by such models are then discussed in terms of the unique conditions allowing ductility in amorphous metal foams. It is shown that despite a small number of brittle uniaxial strut failures, ductile deformation by strut bending predominates in the foams, with the result that all but the densest foam could be compressed to a nominal strain in the vicinity of 80% without macroscopic fracture. (c) 2005 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码:4427 / 4440
页数:14
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