挤压镁铋合金的热压缩变形行为及本构分析

G. Xiong, Lihua Liu, Shuping Hou, Weimin Zhao, Hui Yu, Zhifeng Wang
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引用次数: 0

摘要

利用Gleeble3500D热模拟试验机对Mg-2Bi合金在不同温度和应变速率下进行了等温压缩试验。分析了Mg-2Bi合金在200-350℃和0.001-1.0s-1下的流变应力变化规律。结果表明,Mg-2Bi合金在等温压缩过程中,随着变形温度的降低和应变速率的提高,峰值应力增大,动态再结晶晶粒尺寸减小。此外,合金变形的活化能为130.03kJ/mol。Mg-2Bi合金在低温(200℃)条件下的软化机制主要是孪晶和动态再结晶。在350℃的高温下,软化机制转变为单次动态再结晶。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
HOT COMPRESSION DEFORMATION BEHAVIOR AND CONSTITUTIVE ANALYSIS OF EXTRUDED MAGNESIUM-BISMUTH ALLOYS
The isothermal compression experiments of Mg-2Bi alloys were carried out under different temperature and strain rate by Gleeble 3500D thermal simulation test machine. The rheological stress variation law of the Mg-2Bi alloy was analysed under 200-350oC and 0.001-1.0 s-1. The results present that the peak stress enhances and the dynamic recrystallization grain size reduces with the decline of deformation temperature and the improvement of strain rate during isothermal compression of the Mg-2Bi alloy. In addition, the activation energy for alloy deformation is 130.03 kJ/mol. The softening mechanism of the Mg-2Bi alloy is mainly twin and dynamic recrystallization under a low temperature (200oC) condition. While at a higher temperature of 350oC, the softening mechanism changes to single dynamic recrystallization.
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