高晓兵,何创民,姚婷,王新凯,肖代红,黄兰萍,刘文胜

• 1:陕西有色榆林新材料集团有限责任公司
• 2:中南大学粉末冶金研究院

摘要(Abstract)：

采用Gleeble-3500热压缩模拟试验机对Al-5Mg-2Li-0.1Zr-0.1Sc铝锂合金在变形温度为623～753 K及应变速率为0.01～10 s~(-1)的热变形条件下进行热压缩试验，利用光学显微镜和电子背散射衍射研究了合金在不同变形条件下的组织演化，构建了合金的热加工图。建立了基于双曲正弦函数的合金热变形特征本构方程。结果表明：合金的变形激活能Q为136.159 kJ/mol,合金的流变应力随着变形温度的升高和应变速率的降低而减小；随着应变速率的增大，流变应力达到峰值应力后，动态软化和加工硬化的影响相互交替，流变应力曲线呈周期性波动。随着变形温度的升高和应变速率的降低，小角度晶界合并为大角度晶界，位错密度逐渐降低，析出相数量减少，变形织构减少，再结晶晶粒长大，动态软化机制转变为动态再结晶。

关键词(KeyWords)： 铝锂合金;动态软化;本构方程;组织演变

Abstract:

Keywords:

基金项目(Foundation): 预研基金(6142912180105)

作者(Author): 高晓兵,何创民,姚婷,王新凯,肖代红,黄兰萍,刘文胜

DOI: 10.13289/j.issn.1009-6264.2022-0190

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