稀土La对半固态A356铝合金凝固组织的影响  

Effect of RE on Solidification Microstructure in Semi-Solid A356 Aluminum Alloy

作　　者：刘小梅[1] 刘岚 刘政[1] 

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：《铸造》2010年第7期708-711,共4页Foundry

基　　金：江西省自然科学基金项目资助(0650047);江西省教育厅科技项目资助(GJJ10470)

摘　　要：利用Al-La中间合金对A356铝合金进行了细化处理,并用低过热度浇注技术制备了半固态A356铝合金浆料,研究了细化处理对半固态A356铝合金初生α相形貌和尺寸的影响。研究结果表明,细化处理的A356铝合金经低过热度浇注可制备具有颗粒状和蔷薇状初生α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铝合金初生α相的细化机理。The semi-solid slurry of A356 aluminum alloy,which was grain-refined by Al-La master alloy,was manufactured by low superheat pouring. The effects of grain-refinement on the morphology and the grain size of the primary α phase in semi-solid A356 Al alloy were researched. The results indicate that semi-solid A356 Al alloy with particle-like and rosette-like primary α phases can be prepared by low superheat pouring of liquid A356 alloy after grain-refined. The grain size and morphology of primary α phase in the semi-solid A356 are markedly improved by La. The refining mechanism of La on the grain size of the primary α phase in semi-solid A356 Al alloy was discussed.

关 键 词：半固态 稀土La A356铝合金 低过热度浇注 

分 类 号：TG249.9[金属学及工艺—铸造]