稀土La对半固态A356初生相细化机制的研究  

Research of rare earth La on refining mechanism of primary α phase in semisolid A356 alloy

作　　者：刘政[1] 黄美艳[2] 柯婷婷[2] 

机构地区：[1]江西理工大学机电工程学院,江西赣州341000 [2]江西理工大学材料科学与工程学院,江西赣州341000

出　　处：《有色金属科学与工程》2011年第5期24-28,共5页Nonferrous Metals Science and Engineering

基　　金：江西省自然科学基金项目(0650047);江西省教育厅科技项目(GJJ09229);江西理工大学科学研究基金项目(jxxjzd0003)资助

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,并用低过热度浇注技术制备了半固态A356铝合金浆料,研究了稀土La对所制备半固态A356铝合金的初生α相形貌和尺寸的影响.研究结果表明,含有适量稀土La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.稀土La对半固态A356铝合金的初生α相细化机理可能与稀土在铝合金中诱发的共晶反应有关.The semisolid slurry of A356 alloy,which is grain-refined by Al-La master alloy,is manufactured by low superheat pouring.The effects of La addition on the morphology and the size of the primary α phase in the semisolid A356 alloy are investigated.The results indicate that semisolid A356 alloy contained certain La addition with particle-like and rosette-like primary α phase can be prepared by low superheat pouring.The size and morphology of primary α phase in the semisolid A356 alloy are markedly improved by La addition.The refining mechanism of La of the primary α phase in semisolid A356 alloy is concerned with the eutectic reaction induced by La in the alloy.

关 键 词：A356铝合金 半固态 LA 共晶反应 

分 类 号：TF826.2[冶金工程—有色金属冶金] TG146.2[一般工业技术—材料科学与工程]