热变形条件对Mg-8Li-5Zn-2Re合金织构演变的影响(英文)

Influence of the Hot Deformation Conditions on the Texture Evolution in Mg-8Li-5Zn-2Re Alloy

通过光学显微镜、扫描电镜和X射线衍射研究了Mg-8Li-5Zn-2Re合金热变形过程中组织和织构的演变。Mg-8Li-5Zn-2Re合金热挤压后,α相平行挤压方向伸长呈变形结构。在热压缩过程中随着温度的升高,α相转变为β相。在热挤压过程中,β相产生了{001}<110>和{110}<110>织构,而α相由于基面滑移出现了{0001}<10ī0>织构。由于压缩条件的变化,晶粒的取向分布发生了很显著的变化。利用XRD结果分析了热压缩实验中不同变形温度和应变速率下织构的演变规律。

The microstructure and texture evolution in the hot-deformed Mg-8Li-5Zn-2Re alloy were investigated by optical micrography, SEM and X-ray diffraction. In the hot-extruded Mg-8Li-5Zn-2Re alloy, α phase is elongated approximately parallel to the extruding direction and exhibits a deformed structure. During hot compression, α phase is transformed to β phase with increasing of temperature. At the stage of hot extrusion, {001} 110 and {110} 110 textures of β phase are exhibited, while {0001} 100 texture in α phase is detected due to basal slip. As a result of the frequent changes of compression condition, grain orientation distribution changes obviously. The evolution of deformation texture was analyzed using the XRD analysis in the hot compression test under different deformation temperatures and strain rates.