稀土La对半固态A356铝合金凝固组织的影响  

Research on effect of RE grain-refiner on structure in semi-solid A356 Al alloy

作　　者：刘小梅[1] 刘岚 

机构地区：[1]江西理工大学机电工程学院,江西赣州341000 [2]赣州第四中学,江西赣州341000

出　　处：《轻金属》2010年第10期59-63,共5页Light Metals

基　　金：江西省自然科学基金项目(0650047)

摘　　要：利用Al-La稀土中间合金对液态A356铝合金进行了细化处理,并用低温浇注技术制备了半固态A356铝合金浆料,研究了细化处理对所制备半固态A356铝合金的初生α-Al相形貌和尺寸的影响。结果表明,细化处理的A356铝合金经低温浇注可制备具有颗粒状和蔷薇状初生α-Al相的半固态浆料,稀土La可显著改善半固态A356铝合金中初生α-Al相的晶粒尺寸和颗粒形貌。探讨了稀土La对半固态A356铝合金的初生α-Al相细化机理。The semi-solid slurry of A356 Al alloy,which is grain-refined by Al-La master alloy,is manufactured by low temperature pouring.The effects of grain-refine on the morphology and the grain size of the primary α phase in semi-solid A356 Al alloy manufactured are researched.The results indicate that semi-solid A356 Al alloy with particle-like and rosette-like primary α phases can be prepared by low temperature pouring from liquid A356 alloy grain-refined.The grain size and particle morphology of primary α phase in the ingot in semi-solid A356 are markedly improved by La.The refining mechanism of La on the morphology and the grain size of the primary α phase in semi-solid A356 Al alloy is delved.

关 键 词：半固态 稀土La A356铝合金 低温浇注 

分 类 号：TG292[金属学及工艺—铸造]