双相合金Mg-8Li-1Al的等通道转角挤压 Ⅰ.挤压过程中的变形方式  

EQUAL CHANNEL ANGULAR PRESSING OF A TWO-PHASE ALLOY Mg-8Li-1Al

作　　者：刘腾[1] 张伟[1] 吴世丁[1] 姜传斌[1] 李守新[1] 徐永波[1] 

机构地区：[1]中国科学院金属研究所沈阳材料科学国家(联合)实验室,沈阳110016

出　　处：《金属学报》2003年第8期790-794,共5页Acta Metallurgica Sinica

基　　金：国家自然科学基金项目 50171027;国家重点基础研究发展规划项目 G19990650;沈阳市科委国际合作项目 20010167资助

摘　　要：以X射线衍射分析术为主要分析手段,探讨了双相合金Mg-8Li-1Al(质量分数, ％)在等通道转角挤压(ECAP)变形过程中的变形方式. α相在第1道次ECAP过程中主要的变形方式是{1011}〈1012〉孪生,在随后道次的ECAP过程中主要变形方式为位错滑移,变形方式的转变主要是由于ECAP造成的组织细化效应;对于β相,各道次ECAP的主要变形方式均为位错滑移.The deformation modes during the process of equal channel angular pressing (ECAP) of Mg-8Li-lAl (mass fraction, %) alloy were discussed using the results of X-ray diffraction analyses. Through the analyses of the X-ray diffraction data and the corresponding crystallography, it was found that during the first pass of ECAP, the main deformation mode of α phase is {1011}(1012} twinning, while during the following passes the main deformation mode is dislocation slip. The reason for the above change of deformation mode is attributed to the grain refinement caused by the ECAP process. On the other hand, for the β phase the dislocation slip is the main deformation mode during the whole process of ECAP.

关 键 词：双相合金Mg-8Li-1Al 等通道转角挤压 孪生 位错滑移 

分 类 号：TG146.2[一般工业技术—材料科学与工程] TG37[金属学及工艺—金属材料]