期刊
ACTA MATERIALIA
卷 56, 期 18, 页码 5091-5100出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2008.06.028
关键词
Metallic glasses; Mechanical properties; Ion beam processing; Nanoindentation; Size effects
资金
- US Army Research Laboratory
- Center for Advanced Metallic and Ceramic Systems (CAMCS) [DAAL01-96-2-0047]
- ARMAC-RTP Cooperative Agreement [DAAD19-01-2-0003, W91INF-06-2-0006]
- National Science Foundation [DMR-07505517]
We present quasi-static, room temperature compression data for Pd40Ni40P20 metallic glasses, with specimen sizes ranging from the submicron to several millimeters in diameter. We observe no change in deformation mode over this range. At all sizes, plastic flow is localized in shear bands, which are accompanied by sudden strain bursts. This metallic glass shows only a modest increase in strength in going from bulk to micrometer-sized specimens. We show that stress gradients in tapered specimens can complicate measurement of the yield strength of metallic glasses in microcompression. Estimates of yield strength based on the minimum cross-sectional area implicitly assume that yielding is controlled by a maximum effective shear stress criterion. An alternative is the shear plane yield criterion, in which the minimum shear stress on the shear band trajectory determines yield. Application of this criterion in tapered microspecimens reinforces the notion that metallic glasses possess relatively size-independent mechanical properties. Published by Elsevier Ltd on behalf of Acta Materialia Inc.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据