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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 18    No. 1    January 2008

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Uniformity and continuity of effective strain in AZ91D processed by multi-pass equal channel angular extrusion
ZHANG Xiao-hua(张晓华), LUO Shou-jing(罗守靖), DU Zhi-ming(杜之明)

School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China

Abstract:AZ91D magnesium alloy was processed by equal channel angular extrusion(ECAE). The influence of extrusion temperature, extrusion pass and extrusion route on the ultimate strength of the extruded billet was analyzed. The process of multi-pass extrusion was simulated with the method of finite element analysis, and the continuity and uniformity of effective strain in multi-pass extrusion were investigated. The results show that extrusion pass plays the most important role in improving the ultimate strength of AZ91D magnesium alloy, the extrusion route is the second, and the extrusion temperature is the last. From the numerical simulation, there exists the continuity of the accumulated deformation in multi-pass extrusion and the effective strain increases linearly. The tendency of the strain uniformity is different in multi-pass extrusion with extrusion routes. The results of experiment agree with those of numerical simulation.

 

Key words: AZ91D alloy; equal channel angular extrusion; multi-pass; simulation

ISSN 1672-7029
CN 43-1423/U

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