Microstructure and mechanical behavior of AZ91 Mg alloy processed by equal channel angular pressing
Microstructure and mechanical behavior of AZ91 Mg alloy processed by equal channel angular pressing
复制标题
DOI：
10.1016/j.jallcom.2004.10.050
复制
发表时间：
2005-05
影响因子：
6.2
通讯作者：
K. Máthis;J. Gubicza;N. H. Nam
中科院分区：
文献类型：
--
作者：
K. Máthis;J. Gubicza;N. H. Nam
采用等通道转角挤压（ECAP）工艺制备了细晶AZ91镁合金。研究了ECAP变形道次对组织和变形行为的影响。在室温下，由于ECAP过程中晶粒的细化和位错密度的增加，ECA压缩试样的抗拉强度高于初始状态。在200°C以上，由于c+a位错相对分数的增加以及棒状Al12Mg17析出相在ECAP过程中的破碎，塑性提高。
A fine-grained AZ91 alloy was prepared by equal channel angular pressing (ECAP). The evolution of the microstructure and the deformation behavior were investigated as a function of the number of ECAP passes. At room temperature the tensile strength of the ECA pressed specimens is higher than that of the initial state due to the grain refinement and the increase of the dislocation density during ECAP. Above 200°C the ductility increases due to the increase of the relative fraction of c+a dislocations and also owing to the breakage of the rod-like Al12Mg17precipitates during ECAP processing.