THE MICROSTRUCTURAL EVOLUTION DURING DEFORMATION UNDER SEVERAL STRAIN RATES IN A COMMERCIAL 5182 ALUMINUM-ALLOY

被引：7

作者：

HIGASHI, K ^{[1
]}

MUKAI, T ^{[1
]}

KAIZU, K ^{[1
]}

TSUCHIDA, S ^{[1
]}

TANIMURA, S ^{[1
]}

机构：

[1] SUMITOMO LIGHT MET IND LTD,TECH RES LABS,NAGOYA,AICHI,JAPAN

来源：

JOURNAL DE PHYSIQUE III | 1991年 / 1卷 / C3期

关键词：

D O I：

10.1051/jp4:1991350

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The flow stress of a commercial 5182 aluminum alloy has been investigated as a function of strain rates in the range from 1 x 10(-3) to 4 x 10(3)s-1 at room temperature. The 5182 alloy exhibited the negative strain rate sensitivity of flow stress in a strain rate range below 10(2)s-1, of which the maximum flow stress decreased with increasing strain rate. This tend in flow stress with strain rates was observed for other commercial aluminium alloys which include magnesium atoms in solute such as the 3004 and 7N01 alloys. It seems that the microstructual evolution during deformation has occurred in these alloys. The incremental strain rate tests revealed that the true strain rate sensitivity is positive under the same structure of alloys, and there appear to be the negative strain rate sensitivity corresponding to the microstructural evolution after some deformations. From the observation by transmission electron microscopy, the decreasing of dislocation densities resulting from the arrangement of the network-like deformation bands by dislocations with straining, lead to the lower stresses at the strains where the negative strain rate sensitivity is observed.

引用

页码：347 / 352

页数：6