Negative strain rate sensitivity in bulk metallic glass and its similarities with the dynamic strain aging effect during deformation

被引：76

作者：

Dalla Torre, Florian H. ^{[1
]}

Dubach, Alban ^{[1
]}

Siegrist, Marco E. ^{[1
]}

Loeffler, Joerg F. ^{[1
]}

机构：

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

来源：

APPLIED PHYSICS LETTERS | 2006年 / 89卷 / 09期

关键词：

D O I：

10.1063/1.2234309

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Detailed investigations were carried out on the deformation behavior of Zr-based monolithic bulk metallic glass and bulk metallic glass matrix composites. The latter, due to splitting and multiplication of shear bands, exhibits larger compressive strains than the former, without significant loss of strength. Serrated flow in conjunction with a negative strain rate sensitivity was observed in both materials. This observation, together with an increase in stress drops with increasing strain and their decrease with increasing strain rate, indicates phenomenologically close similarities with the dynamic strain aging deformation mechanism known for crystalline solids. The micromechanical mechanism of a shear event is discussed in light of these results. (c) 2006 American Institute of Physics.

引用

页数：3

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