挤压态AZ31镁合金热变形过程中的孪生和织构演变

中国有色金属学报, 2016, 26(2): 288-295.

挤压态AZ31镁合金热变形过程中的孪生和织构演变

1.湖南大学汽车车身先进设计制造国家重点实验室,长沙410082;湖南科技大学高温耐磨材料及制备技术湖南省国防科技重点实验室,湘潭411201

2.湖南科技大学高温耐磨材料及制备技术湖南省国防科技重点实验室,湘潭,411201

3.湖南大学汽车车身先进设计制造国家重点实验室,长沙,410082

4.湖南科技大学高温耐磨材料及制备技术湖南省国防科技重点实验室,湘潭,411201

基金项目: 国家自然科学基金资助项目(51475156) 湖南省自然科学基金资助项目(2015JJ56040) Project(2015JJ5604) supported by the Hunan Provincial Natural Science Foundation of China 湖南省教育厅科研资助项目(15C0527) 湖南大学汽车车身先进设计制造国家重点实验室开放基金资助项目(31415004) Project(15C0527) supported by the Research Foundation of Education Bureau of Hunan Province,China Project(51475156) supported by the National Science Foundation of China Project(31415004) supported by the Science Fund of State Key Laboratory of Advance Design and Manufacturing for Vehicle Body,China

关键词： AZ31镁合金 , 织构 , 拉伸孪生 , 斯密特因子

Twinning and texture evolution in extruded AZ31 magnesium alloy during hot deformation

Keywords： AZ31 magnesium alloy , texture , extension twinning , schmid factor

采用100 kN servo-hydraulic MTS型试验机对挤压态AZ31镁合金进行温度为350℃、应变速率为0.3s-1和不同应变量下的热压缩;利用X射线衍射(XRD)测量不同应变量下的织构,并利用取向分布函数计算其织构类型,分析织构转变;通过电子背散射衍射技术(EBSD)分析孪生的形成情况.同时,计算不同滑移系和孪生的斯密特因子,分析不同滑移系和孪生开启的先后次序.结果表明:变形初期,由于拉伸孪生的出现导致(0001) [10(1)0]和(0001) [2(1)(1)0]织构的形成,并随应变量的增加,发生动态再结晶,(01(1)0) [0001]和((1)2(1)0)[0001]纤维织构完全由(0001)[10(1)0]和(000l)[2(1)(1)0]织构代替;在变形初期,大部分晶粒先产生拉伸孪生,接着发生二阶锥面滑移.

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