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采用喷射沉积技术制备Mg-9Al-3Zn-1Mn-6Ca镁合金沉积坯,并对其进行挤压预变形和二次热压缩变形,研究热变形过程中再结晶、超塑性之间的微观组织演变。结果表明,二次热压缩变形后的镁合金在350℃、0.002s-1变形速率条件下,实现了镁合金超塑性压缩变形,外缘圆周伸长率达到103.96%;超塑性变形发生时伴随着动态再结晶发生,且当加工硬化速率与软化速率达到动态平衡时会出现压缩超塑性,350℃时变形速率是影响高Ca镁合金超塑性的主要因素。
The deposition of Mg-9Al-3Zn-1Mn-6Ca magnesium alloy was performed by spray deposition technique. The pre-deformation and the secondary hot compression deformation of Mg-9Al-3Zn-1Mn-6Ca magnesium alloy were investigated. The microstructure evolution of recrystallization and superplasticity during hot deformation . The results show that the superplastic compression deformation of the magnesium alloy is achieved with the deformation rate of 0.002s-1 at 350 ℃ and the circumferential elongation of the outer circumference reaches 103.96%. The superplastic deformation is accompanied with Dynamic recrystallization occurs, and compressive superplasticity occurs when the work hardening rate and softening rate reach dynamic equilibrium. The deformation rate is the main factor that affects the superplasticity of Ca-Mg alloy at 350 ℃.