张聪正,廖慧敏,曾明,杨刚,刘杨

• 1:西华大学材料与工程学院

摘要(Abstract)：

采用自制装置对AZ81镁合金进行压入蠕变实验,通过建立稳态压入蠕变本构模型分析合金的蠕变机制,利用扫描电镜(SEM)和X射线衍射(XRD)等方法研究合金蠕变前后的组织和成分。结果表明:压铸AZ81合金在稳态蠕变阶段的应力指数n为2.08,蠕变激活能QC为87.26 kJ/mol;蠕变诱导β相首先由非连续方式析出,到达一定程度后连续析出;沿晶界析出的β相导致合金抗蠕变性能降低;蠕变温度越高,基体和析出相的晶粒尺寸越大;压铸AZ81合金的压入蠕变机制为晶界扩散主导的位错交滑移运动。

关键词(KeyWords)： 压铸AZ81合金;压入蠕变;激活能;应力指数

Abstract:

Keywords:

基金项目(Foundation): 西华大学研究生创新基金(Ycjj201155);; 四川省教育厅青年基金(10ZB079)

作者(Author): 张聪正,廖慧敏,曾明,杨刚,刘杨

DOI: 10.13289/j.issn.1009-6264.2012.05.020

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