材料期刊网

铜单晶ECAE过程的剪切特征

吴世丁 , 李强 , 姜传斌 , 李广义 , 王中光

金属学报 doi:10.3321/j.issn:0412-1961.2000.06.009

以铜单晶为模型材料,采用扫描电镜电子通道衬度术(SEM-ECC)和透射电子显微技术,在不同尺度上研究了单次和两次等通道转角挤压(equal channel angular extrusion,ECAE)过程的剪切形变特征.结果表明:(1)一次ECAE挤压产生的剪切形变取向与理论预测相接近,但剪切形变表现出局部化特征,出现了微观尺度上的剪切带;(2)两次ECAE产生的两套剪切带间存在着交互作用,导致剪切带出现分叉现象,方向也与理论预测结果有所偏差,但仍能保持其各道次的剪切特征;(3)第2次ECAE后,剪切形变的不均匀性得到改善,组织更加细化,而且相邻亚晶取向差也有所增大.

关键词: 铜单晶 , ECAE , 剪切局部化

A Finite Element Simulation of NiTi Alloy during Equal Channel Angular Extrusion

武汉理工大学学报-材料科学版(英文版) doi:10.1007/s11595-010-0101-4

关键词:

Numerical simulation of temperature field of AZ91D magnesium alloy during equal channel angular extrusion

Xiaohua ZHANG

金属学报(英文版)

The temperature field of AZ91D magnesium alloy extruded by equal channel angular extrusion (ECAE) has been simulated using finite element method (FEM). A series of tests were designed to obtain the simulation parameters: flow stress of AZ91D, friction factor and heat transfer coefficient. The simulated temperature agrees well with the measured one. The evolution of temperature and influencing factor was discussed in details. Furthermore, the extrusion pressure of ECAE was analyzed.

关键词: Simulation , 温度场 , 等通道角挤压 , AZ91D；镁合金