Effects of ECAE temperature and billet orientation on the microstructure, texture evolution and mechanical properties of a Mg-Zn-Y-Zr alloy
Effects of ECAE temperature and billet orientation on the microstructure, texture evolution and mechanical properties of a Mg-Zn-Y-Zr alloy
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ECAE温度和坯料取向对Mg-Zn-Y-Zr合金显微组织、织构演变和力学性能的影响
DOI：
10.1016/j.msea.2008.09.048
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发表时间：
2009-01-15
期刊：
影响因子：
6.4
通讯作者：
Han, E. H.
中科院分区：
文献类型：
--
作者：
Tang, W. N.;Chen, R. S.;Han, E. H.
在473 K和623 K条件下，对一种初始基底织构较强的Mg-Zn-Y-Zr合金进行了单道等径角挤压（ECAE）实验。研究了ECAE温度和坯料取向对ECAEed合金组织、织构演变和力学性能的影响。结果表明，在Orient-I方坯取向（挤压板的法向方向与ECAE出口方向平行）中，单道ECAE的晶粒细化效果优于Orient-II方坯取向（挤压板的法向方向与ECAE出口方向垂直）。473 K时的平均晶粒尺寸明显小于623 K时的晶粒尺寸。合金ECAEed在473 K时的极点图显示，Orient-I和Orient-II样品的基面相对于ECAE挤出物的纵向分别倾斜了40和35左右。而对于623 K时的ECAEed合金，大部分基面与ECAE挤出物的纵向平行。ECAEed合金在473 K时的屈服强度明显低于623 K时的屈服强度。ECAE温度与合金力学性能之间的特殊关系归因于ECAE过程中织构的演变。(C) 2008 Elsevier B.V.版权所有
Single-pass equal channel angular extrusion (ECAE) experiments of an extruded Mg-Zn-Y-Zr alloy with an intense initial basal texture were performed in two inter-perpendicular billet orientations and at 473 and 623 K. The study was aimed to determine the effects of ECAE temperature and billet orientation on the microstructure, texture evolution and mechanical properties of the ECAEed alloy. It was found that the grain refinement achieved through the single-pass ECAE in the Orient-I billet orientation (the normal direction (ND) of the extruded plate parallel with the ECAE exit direction) was more effective than that in the Orient-II billet orientation (the ND of the extruded plate perpendicular to the ECAE exit direction). The average grain sizes after ECAE at 473 K were much smaller than those after ECAE at 623 K. The pole figures of the alloy ECAEed at 473 K showed that most of the basal planes in the Orient-I and Orient-II samples were inclined about 40 and 35, respectively, with respect to the longitudinal direction of the ECAE extrudate. However, for the alloy ECAEed at 623 K, most of the basal planes were parallel with the longitudinal direction of the ECAE extrudate. It was remarkable that the yield strengths of the alloy ECAEed at 473 K were lower than those at 623 K. The peculiar relationship between ECAE temperature and the mechanical properties of the alloy was ascribed to the texture evolution during ECAE. (C) 2008 Elsevier B.V. All rights reserved.