摘要
倾斜式冷却剪切流变制备半固态Al Mg合金过程中,合金在冷却板表面非均匀形核,并受到重力的剪切作用,合金组织逐渐从粗大等轴晶网络演化为细小的球形晶;在660～690℃浇注得到了细小球形的Al 1%Mg合金组织。倾斜式冷却剪切流变技术很好的改善了常规铸造高Mg铝合金中出现的羽毛晶组织,合金组织由粗大的羽毛晶向细小的球形晶转化。
During manufacturing semisolid Al-Mg based alloy by rheocasting of incline cooling and shearing,melt alloy heterogeneously nucleated on the incline-cooling plate surface and was sheared under the gravity force,and alloy microstructure gradually evolves from big net-work composed of equiaxed dendrites to small spherical grain.By controlling casting temperature in the range of 660～690 ℃,fine spherical microstructures of Al-1%Mg alloy were obtained.Feather dendrites in the conventional casting slab of high Mg component alloy were completely modified.Microstructures of high Mg component alloy evolve from coarse feather dendrites to fine spherical grains.
出处
《轻合金加工技术》
CAS
2004年第11期15-18,36,共5页
Light Alloy Fabrication Technology
基金
国家自然科学基金资助项目(50274020)
