变形态Mg-Nd合金的组织转变和拉伸性能特征.pdfVIP

第 34 卷第6 期 稀有金鹏材料与工程 Vo 1.34, NO.6 2005 年 6 月 民ARE METAL MATERIALS AND ENGIN巴巴民lNG June 2005 离licrostructural Evolution and Tensile Properties Features ofWrought Mg-Nd Alloy I I I I 2 2 Yan Yunqi , Zhang Tingjie , Deng JU , Zhou Lian , Chen Changqi , Liu Peiying (1. Northwest Institute for Nonferrous Metal Research , Xian 710016 , China) (2. School ofMaterials Science and Engineering , Beihang University, Beijing 100083, China) Abstract: Effects of various deformed conditions on microstructures and tensile properties of Mg-2.5Nd-0.5Zr卜0.5Zr wt% (Mg-Nd) alloy were investigated. Mg-Nd alloy as-extruded exhibit higher strength and better ductility compared to that of as-T6 condition , while its ratio of yield strength to ultimate strength is enhanced 命om 0.58 to 0.87. With increasing of the extrusion strain rate , both yield strength and ultimate strength increase at the constant extrusion temperature. Nevertheless , the ductility obeys the opposite regulation. At the same extrusion strain rate , both yield strength and ultimate strength decrease with increasing of the extrusion temperature. Fine Mg9Nd compound particles precipitated in the grain boundaries refine the grains resulting in improving the mechanical properties of as-extruded Mg-Nd alloy. The alloy superplasticity behavíor was also exploited in the tensile tests at high temperatures. The resu Its depict that 375C is the optimal deformation temperature , whil