固液混合流变铸造工艺对Al-15Zn合金组织的影响  

Influence of Solid-Liquid Mixed Rheocasting Process on Al-15Zn Alloy Microstructure

作　　者：王骥[1,2] 郭洪民[1,2] 张力文[1,2] 王乾[1,2] 桂云鹏 

机构地区：[1]南昌大学材料科学与工程学院,江西南昌330031 [2]江西省高性能精确成形重点实验室,江西南昌330031

出　　处：《热加工工艺》2016年第9期20-22,26,共4页Hot Working Technology

基　　金：高校博士点专项科研基金项目(20113601110008);江西省自然科学基金重点项目(20133ACB21003);江西省自然科学基金项目(20122BAB206021);江西省青年科学家资助计划项目(20122BCB23001);国家自然科学基金项目(11364301)

摘　　要：采用优化的固液混合流变铸造工艺,研究了不同搅拌速度和搅拌时间对Al-15Zn合金微观组织的影响。结果表明:在搅拌预制体的凝固过程中,熔体心部温降最快,距心部越远降温速度越慢,快速搅拌的熔体要比缓慢搅拌获得的半固态组织的晶粒更细。搅拌时间越长,预制体晶粒破碎越显著,晶粒细化效果越好。在相同搅拌条件下,含锌量越高的铝锌合金的晶粒细化效果越好。The effects of different stirring speeds and stirring times on microstructure of Al-15Zn alloy were studied by using optimized solid-liquid mixing rheocasting process. The results show that in the solidification process of stirring preforms, temperature drop of melt at the center is the fastest. The farther it is from the center, the slower cooling rate is.Semi-solid microstructure grains of the melt by rapid stirring are finer than those of the melt by slow stirring. The longer stirring time is, the more significant grain crushing of preforms is, and the better grain refinement is. In the same stirring condition, the higher zinc content of aluminum-zinc alloy is, the better grain refinement is.

关 键 词：半固态 Al-15Zn合金 微观组织 

分 类 号：TG249.9[金属学及工艺—铸造]