Serrated flow in AZ91 magnesium alloy in tension and compression

被引：0

作者：

Trojanova, Z. ^{[1
]}

Caceres, C. H. ^{[2
]}

Lukac, P. ^{[1
]}

Cizek, L. ^{[3
]}

机构：

[1] Charles Univ Prague, Fac Math & Phys, Dept Phys Mat, CZ-12116 Prague 2, Czech Republic

[2] Univ Queensland, Sch Engn, ARC Ctr Excellence Design Light Met, Brisbane, Qld 4072, Australia

[3] VSB Tech Univ Ostrava, CZ-70800 Ostrava, Czech Republic

来源：

KOVOVE MATERIALY-METALLIC MATERIALS | 2008年 / 46卷 / 05期

关键词：

serrated yielding; dislocations; solid solution; diffusion; collective motion of dislocations; acoustic emission;

D O I：

暂无

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

AZ91 magnesium alloy exhibits jerky flow when deformed a short time after solution heat treatment and quenching. The occurrence of stress drops and discontinuous plastic deformation has been observed at temperatures in the vicinity of ambient temperature in tension as well as compression. The alloy exhibits some degree of negative strain rate sensitivity. Acoustic emission accompanies the stress drops. It is concluded that successive deformation bands propagate along the gauge length as soon as the material develops gross plastic deformation, regardless of the applied strain rate. The results are discussed in terms of current theories for the Portevin-LeChatelier effect.

引用

页码：249 / 256

页数：8

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