Negative strain-rate sensitivity in a nanostructured aluminum alloy

被引：19

作者：

Han, Bing Q. ^{[1
]}

Huang, Jianyu

Zhu, Yuntian T.

Lavernia, Enrique J.

机构：

[1] Univ Calif Davis, Dept Chem Engn & Mat Sci, Davis, CA 95616 USA

[2] Boston Coll, Dept Phys, Chestnut Hill, MA 02467 USA

[3] Los Alamos Natl Lab, Div Mat Sci & Technol, Los Alamos, NM 87545 USA

来源：

ADVANCED ENGINEERING MATERIALS | 2006年 / 8卷 / 10期

关键词：

D O I：

10.1002/adem.200600164

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The strain rate sensitivity of several nanometer and ultrafine-grain (UFG) materials had been studied at room temperature to understand the deformation mechanisms. The purpose of the study was to investigate the influence of strain rate on the deformation behavior of a nanostructured 5083 Al alloy processed by cryomilling and hot extrusion and to provide insight into the underlying deformation mechanisms of UFG Al alloys. A positive strain rate sensitivity of flow stress at room temperature was observed in the compression deformation of nanocomposite Al-Ti-Cu alloy, and a small negative strain rate sensitivity was noticed in the tensile deformation of UFG Al-Mg alloy. The negative strain rate sensitivity is attributed to the effect of dynamic strain aging which is caused by the interactions of dislocations with solute atoms. The near-perfect plastic flow was caused by dynamic recovery and dislocation emission and annihilation at grain boundaries.

引用

页码：945 / 947

页数：3

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