(1. 中南大学 材料科学与工程学院，长沙 410083；
2. 苏州大学 沙钢钢铁学院，苏州 215006)
摘 要: 采用光学显微镜(OM)、扫描电子显微镜(SEM)、电子背散射衍射技术(EBSD)、透射电子显微镜(TEM)等分析预置粒子对ZM6镁合金热压缩过程中显微结构的影响，并在室温下进行室温力学性能测试。结果表明：预置粒子能够有效促进热变形过程中的动态再结晶行为，热压缩后合金组织细化、织构弱化，抗拉强度和伸长率都显著提升。和固溶态样品相比，预置粒子样品在510 ℃下再结晶体积分数由85%提升至100%，在不损害强度的前提下，伸长率提升至18.2%，提升了30%。
关键字: ZM6镁合金；预置粒子；热压缩；动态再结晶；力学性能
（1. School of Materials Science and Engineering, Central South University, Changsha 410083, China;
2. School of Iron and Steel, Soochow University, Suzhou 215100, China）
Abstract:The effects of pre-existing particles on the microstructure of a ZM6 magnesium alloy during hot deformation were investigated by optical microscopy (OM), scanning electron microscopy (SEM), back-scattering diffractometry (EBSD), and transmission electron microscopy (TEM). The mechanical properties were detected through tensile tests at room temperature. The results show that dynamic recrystallization (DRX) is remarkably promoted during compression by the pre-existing particles. Accordingly, obvious grain refinement and basal texture weakening are observed after compression, resulting in improvement of ultimate tensile strength and elongation. Compared with the sample without pre-existing particles, the volume fraction of dynamic recrystallization increases from 85% to almost 100%, and the elongation of compressed sample with pre-existing particle treatment increases by 30%, reaching a maximum of 18.2%, without any drop in strength.
Key words: ZM6 Mg alloy; pre-exiting particle; hot compression; dynamic recrystallization; mechanical properties
