喷射沉积高Ca镁合金热变形行为研究  

Hot Deformation Behavior of High-Ca Magnesium Alloy Produced by Spraying Deposition

作　　者：赵娜娜[1] 李振亮[1] 刘飞[1] 袁爱萍[1] 贾国栋[1] 杨苏冰 

机构地区：[1]内蒙古科技大学材料与冶金学院 [2]北京科技大学冶金与生态工程学院

出　　处：《特种铸造及有色合金》2015年第7期754-758,共5页Special Casting & Nonferrous Alloys

基　　金：国家自然科学基金资助项目(51364032)

摘　　要：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 Mg-9Al-3Zn-1Mn-6Ca alloy billets were produced by spraying deposition method（the Osprey process）.The microstructure evolution between recrystallization and superplasticity of the deposed billets prepared was observed during pre-deformation and compression deformation.The results show that the superplastic compression deformation can be observed at 350 ℃ and 0.002s-1,and the elongation of outer edge of circumferential reaches up to 103.96%.Superplastic behavior,in which the hardening rate and the dynamic softening rate realize dynamical equilibrium,is accompanied with the occurrence of dynamic recrystallization at 350 ℃,and the strain rate is the key to the superplastic compression deformation in hot-extruded magnesium alloys modified by high-Ca alloying.

关 键 词：喷射沉积 镁合金 再结晶 超塑性 

分 类 号：TG146.22[一般工业技术—材料科学与工程]