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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 13    No. 3    June 2003

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Forgeability of AZ31B magnesium 
alloy in warm forging
ZHANG Xian-hong(张先宏)1, RUAN Xue-yu(阮雪榆)1, K. Osakada2

1. National Die and Mold CAD Engineering Research Center, 
Shanghai Jiaotong University, Shanghai 200030, China;
2. Division of Mechanical Science, School of Engineering Science, 
Osaka University, Machikaneyama, Toyonaka, Osaka 560-8531, Japan

Abstract:To understand the forming behaviour of magnesium alloys, the upsetting test of Mg alloys at evaluated temperature was conducted. It is found that Mg alloys are brittle at temperatures below 200℃. When temperature is higher than 400℃, Mg alloy is not suitable for forging because of heavy oxidation. Mg alloy shows an excellent workability at temperatures from 250 to 400℃. Because in warm forging the flow stress decreases with increasing strain, which is so-called work softening, no appropriate material formulation is available for Mg alloys. For the evaluation of flow stress of Mg alloys in warm forging processes, a formula is derived by analyzing the stress data measured at various temperatures in upsetting test. It is demonstrated that the formula fits the flow stress obtained from experiment.

 

Key words:  magnesium alloy; flow stress; warm forging; work softening; dynamic recrystallization

ISSN 1672-7029
CN 43-1423/U

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