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采用一种新型形变热处理方法制备细晶Al-Mg-Li合金板材,研究静态再结晶退火对合金板材晶粒组织及超塑变形行为的影响。结果表明,晶粒尺寸、形状和织构的分布沿板材法向方向存在明显不同;表面层的晶粒组织细小、等轴,含有旋转cubeND{001}<310>取向;中心层具有粗大、长条状晶粒,含有α取向线的织构组分。随着再结晶温度的升高,整个板材的晶粒尺寸长大,中心层晶粒纵横比减小,表面层织构强化而中心层织构弱化,超塑性伸长率下降。升高再结晶温度导致整个板材内的旋转cubeND{001}<310>织构组分强化而α取向线的织构弱化。分析了不同温度下再结晶织构的形成机制。
A new type of deformation heat treatment method was used to prepare fine-grained Al-Mg-Li alloy plate to study the effect of static recrystallization annealing on the grain structure and superplastic deformation behavior of the alloy plate. The results show that the distribution of grain size, shape and texture are obviously different along the normal direction of the sheet. The grain structure of the surface layer is small and equiaxed and contains the orientation of rotating cubeND {001} <310>. The center layer has coarse and long Striped grains, textured components containing alpha-oriented lines. With the increase of recrystallization temperature, the grain size of the whole plate grows, the aspect ratio of the central layer decreases, the texture of the surface layer strengthens and the texture of the central layer weakens, and the elongation of the superplastic decreases. Increasing the recrystallization temperature results in the strengthening of the textured cubeND {001} <310> texture throughout the panel and the weakened texture of the alpha-oriented line. The formation mechanism of recrystallized texture at different temperatures was analyzed.