(安徽工业大学 材料科学与工程学院，马鞍山 243002)
摘 要: 利用背散射电子衍射技术分析了Z1(Mg-1.0Zn(质量分数，%))和ZX115(Mg-1.0Zn-1.5Ca(质量分数，%))镁合金热压缩变形后的显微组织、织构特征及再结晶晶粒的Schmid因子。结果表明：Ca的添加可以有效地细化动态再结晶晶粒，固溶至基体的Ca降低镁晶格轴比值，而未完全固溶的富Ca相在变形过程中破碎成粒子后促进了再结晶形核，这些因素均有利于弱化合金形变织构。随着变形温度的升高或应变速率的降低，织构强度随之增加。再结晶晶粒的Schmid因子对变形温度的变化较对应变速率的变化更为敏感。
关键字: 镁合金；热压缩；织构；动态再结晶；Schmid因子
（School of Materials Science and Engineering, Anhui University of Technology, Ma’anshan 243002, China）
Abstract:The microstructure, texture characteristics and Schmid factor of recrystallized grains of hot compressed Z1 (Mg-1.0Zn (mass fraction, %)) and ZX115 (Mg-1.0Zn-1.5Ca (mass fraction, %)) alloys were investigated by electron back-scattered diffraction. The results show that Ca addition contributes to the grain refinement due to the occurrence of dynamic recrystallization during the hot compression. Ca element is solution-treated into magnesium matrix, resulting in a relatively lower c/a axial ratio of crystal lattice than pure magnesium, and those undissovled Ca-rich phases are fractured to particles and then stimulate the recrystallization nucleation. Both of them promote the weakening of texture. The intensity of texture usually increases with increasing the temperature or decreasing the strain rate. The deformation temperature tends to have a stronger effect on the Schmid factor of recrystallized grains than strain rate.
Key words: magnesium alloy; hot compression; texture; dynamic recrystallization; Schmid factor
