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研究了Mg-9Gd-4Y-0.6Zr挤压合金在静态退火过程中的微结构与织构的演变。采用金相显微镜、扫描电子显微镜、透射电子显微镜、XRD织构测试仪及EBSD分析技术表征了合金的晶粒长大、析出相沉淀及织构改变。结果表明,退火初期的晶粒细化是由再结晶引起的;晶间不均匀变形诱发了晶间的局部析出,继而抑制了再结晶过程。织构分析表明,热挤压产生了常见的基面纤维织构和不常见的柱面纤维织构,即c轴平行于挤压方向;在静态再结晶过程中,新晶粒形核会弱化柱面纤维,而晶粒长大过程会强化柱面纤维。晶界与亚晶界上的大量析出相抑制了织构改变。
The microstructure and texture evolution of Mg-9Gd-4Y-0.6Zr alloy during static annealing were studied. The grain growth, precipitate precipitation and texture change of the alloy were characterized by means of metallographic microscope, scanning electron microscope, transmission electron microscope, XRD texture analyzer and EBSD analysis. The results show that the grain refinement in the initial annealing is caused by recrystallization. The non-uniform intergranular deformation induces the local precipitation between the grains and then the recrystallization. Texture analysis shows that hot extrusion produces common basal fiber texture and uncommon cylinder fiber texture, ie, the c-axis is parallel to the extrusion direction; during the static recrystallization, the new grain nucleation will be weakened Cylindrical fibers, and grain growth process will strengthen the cylinder fiber. Large amounts of precipitates on grain boundaries and subgrains inhibit texture changes.