Mechanical properties of an ultrafine-grained Al-7.5 pct Mg alloy

被引:134
作者
Han, BQ [1 ]
Lee, Z
Nutt, SR
Lavernia, EJ
Mohamed, FA
机构
[1] Univ Calif Irvine, Dept Engn & Mat Sci, Irvine, CA 92697 USA
[2] Univ Calif Davis, Dept Mat Sci & Engn, Davis, CA 95616 USA
[3] Univ Calif Davis, Dept Chem Engn & Mat Sci, Davis, CA 95616 USA
来源
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE | 2003年 / 34卷 / 03期
关键词
D O I
10.1007/s11661-003-0095-z
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
In the present study, the relationships between the structure and properties of a cryomilled Al-7.5 pct Mg alloy were investigated. The microstructure of the cryomilled Al-7.5 pct Mg alloy consisted of equiaxed grains with an approximate size of 300 nm. Thermal treatment had only a minor effect on microstructure, as evidenced by X-ray diffraction (XRD) and transmission electron microscopy (TEM) results. The tensile behavior was characterized by high strength, high ductility, and low-strain-hardening. The tensile deformation was relatively uniform, with limited necking deformation, and fracture surfaces were characterized by microdimples. The variation of strain rates from 4 (.) 10(-4) to 4 (.) 10(-2) s(-1) had an insignificant effect on tensile behavior. Comparison of compressive and tensile behavior revealed similar moduli and yield strengths, although the postyield behavior was markedly asymmetric. The present results indicate that grain-size effects, solid-solution strengthening, Orowan strengthening, and dislocation strengthening contribute significantly to the properties of a cryomilled Al-7.5 pct Mg alloy.
引用
收藏
页码:603 / 613
页数:11
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