Indentation of bulk metallic glasses: Relationships between shear bands observed around the prints and hardness

被引：80
作者：
Keryvin, V. [1 ]
机构：
[1] Univ Rennes 1, CNRS, LARMAUR, FRE 2717, F-35042 Rennes, France
来源：
ACTA MATERIALIA | 2007年 / 55卷 / 08期
关键词：
metallic glasses; microindentation; hardness; shear bands; pressure sensitivity; constraint factor; finite element analysis;
D O I：
10.1016/j.actamat.2006.12.005
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Indentation studies are conducted on two different bulk metallic glasses and for a variety of indenters: spherical, conical and pyramidal. Shear bands are observed around the prints for only some types of indenters and reasons for this are sought. Analytical models of hardness accounting or not for the pressure dependence of amorphous alloys and finite element analyses are used. It is shown that these bands are observed only when we leave the elastoplastic regime of indentation in favour of a fully plastic one. Important conclusions are drawn about hardness values. In metallic glasses, compared with, for example, crystalline alloys, because of their tremendous yield strains, determining the true hardness of a particular amorphous alloy is not straightforward; it depends on the correct choice of indenter. (C) 2007 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码：2565 / 2578
页数：14
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