贾玉鑫,黄金亮,冯剑

• 1:河南科技大学材料科学与工程学院

摘要(Abstract)：

采用Gleeble-1500D热模拟机对Mg-8Li-2Al-1Zn合金进行热压缩实验,研究了变形温度为523~723 K、应变速率为0.01~10 s-1条件下的合金热变形行为,并建立了合金的流变应力本构方程及热加工图。结果表明:Mg-8Li-2Al-1Zn合金的流变曲线均属于动态再结晶型,流变应力随着温度升高(应变速率降低)而减小。显微组织的变化验证了动态回复和动态再结晶的发生。Mg-8Li-2Al-1Zn合金流变应力本构关系可以用双曲正弦函数和Z参数准确的描述,平均应力指数为4.62,平均热激活能为139.35 J/mol。根据建立的加工图,预测合金热变形的最佳工艺参数为:523~573 K,0.1~1 s-1。

关键词(KeyWords)： 镁锂合金;热变形;动态再结晶;本构方程;微观组织

Abstract:

Keywords:

基金项目(Foundation): 河南省有色金属重点实验室基金资助项目(2011YSKF12)

作者(Author): 贾玉鑫,黄金亮,冯剑

DOI: 10.13289/j.issn.1009-6264.2014.09.041

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