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.
出处
《特种铸造及有色合金》
CAS
CSCD
北大核心
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)
关键词
喷射沉积
镁合金
再结晶
超塑性
Spraying Deposition
Magnesium Alloy
Recrystallization
Superplasticity
