日本金属学会誌

J. Japan Inst. Metals, Vol. 57, No. 1 (1993),
pp. 36-44

Method for Predicting Flow Stress of Solution- and Dispersion Hardened Alloys at High Temperatures

Hideaki Miyagawa1, Hideharu Nakashima2 and Hideo Yoshinaga2

1Ariake National College of Technology, Omuta 836
2Department of Materials Science and Technology, Graduate School of Engineering Sciences, Kyushu University 39, Kasuga 816

Abstract:

For clarification of the path dependence of flow stress in a solution- and dispersion hardened alloy at high temperatures, stress-strain curves were measured at 673 and 573 K for several different deformation paths using Al--3.1 at%Mg--1.3 vol%Be and Al--2.8 at%Mg--0.97 at%Mn alloys. A method for the theoretical prediction of flow stress along an arbitrary deformation path was proposed based on the deformation mechanism in a solution- and dispersion hardened alloy at high temperatures. The theoretical stress-strain and creep curves were compared with the experimental ones.
The results are summarized as follows.

(1) The flow stress strongly depends on the deformation path in the same manner as solution hardened alloys without dispersoid.

(2) The dispersion hardening component øverline{σip} depends on the flow stress σ as
\begin{equation*


(Received July 24, 1992)

Keywords:

aluminum--magnesium--beryllium alloy, aluminum--magnesium--manganese alloy, solution hardening, dispersion hardening, high temperature deformation, deformation path, internal stress, attractive interaction, solute atmosphere, drag stress, dislocation density


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