徐淑波,张小东,景财年,林晓娟,刘鹏.剧烈塑变形对AZ31镁合金微观组织演化的影响[J].稀有金属材料与工程,2018,47(5):1607~1612.[Xu Shubo,Zhang Xiaodong,Jing Cainian,Lin Xiaojuan,Liu Peng.Effect of severe plastic deformation on the microstructure evolution of bulk AZ31 Mgmgnesium alloys[J].Rare Metal Materials and Engineering,2018,47(5):1607~1612.]
剧烈塑变形对AZ31镁合金微观组织演化的影响
投稿时间:2016-04-27  修订日期:2016-06-02
中文关键词:  等截面通道角挤压  有限元数值模拟  单元点映射法  超细晶  挤压路线
基金项目:国家自然科学基金资助(项目号41305124)
中文摘要:
      等截面通道角挤压(Equal channel angular Extrusion, ECAE)是制备无疏松孔洞大块超细晶材料的重要方法之一。论文通过刚塑性有限元法对ECAE进行三维数值仿真,采用单元点映射方法,结合三维模型转换进行了A,Ba,Bc和C多次挤压路线的有限元连续仿真,得出了圆形截面挤压试样等效应变分布及其变形均匀性规律,同时,给出了多次挤压不同挤压路线等截面通道角挤压晶粒细化机理。通过变换挤压路线可以改变挤压试样内部微观组织结构。随着挤压次数的增加,不同挤压路线对应挤压试样均得到有效细化,与其它挤压路线相比,路线Bc和C能够得到大角度晶界的等轴晶粒分布的挤压试样。同时,通过实验得到的各路线挤压试样对应的微观结构演化规律与模拟分析得到的应变分布规律一致。
Effect of severe plastic deformation on the microstructure evolution of bulk AZ31 Mgmgnesium alloys
英文关键词:Equal channel angular extrusion/pressing  Finite element numerical analysis  Reflection method  Ultra-fined grain  Processing routes
英文摘要:
      Equal channel angular pressing (ECAP) processes have the capability to produce bulk nonstructural materials without loose holes. Using commercial metal forming finite element code, ECAP process is analyzed numerically in this paper. It is combining through node reflection method and three-dimensional model switching to realize multi-pressing process of Routs A, Ba, Bc and C by using finite element method, the distribution of accumulated effective strain and the influence rules of deformation uniformity in round billets are obtained, and the grain refine mechanism of equal channel angular multi-pressing for different processing Routes are obtained. The microstructure evolution of the workpiece can be changed via different processing routes. With increase of passes pressing, the grain microstructure in the workpiece is gradually refined for different processing routes. It is found that route Bc can get a high angle grain boundaries distribution in the workpiece than other routes. In addition, the experimental microstructure results are also consistent with FE analysis results. The microstructure evolutions of grain refinement mechanisms for different multi-pass ECAE processing routes are accord with the accumulated effective strain rules in the workpiece. Those results can offer better process planning and guidelines for ECAP experiments.
作者单位E-mail
徐淑波 山东建筑大学 xushubosd@163.com 
张小东 山东建筑大学 材料科学与工程学院  
景财年 山东建筑大学 材料科学与工程学院  
林晓娟 山东建筑大学 材料科学与工程学院  
刘鹏 山东建筑大学 材料科学与工程学院  
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