强冷条件下Sn-30Sb合金熔体结构改变对凝固的影响  

Effects of the Melt Structure Transition on the Microstructure of Sn-30Sb Alloy by Forced Cooling

作　　者：陈轶平[1] 刘兰俊[1] 祖方遒[1] 益汛[1] 周兵[1] 

机构地区：[1]合肥工业大学材料科学与工程学院

出　　处：《特种铸造及有色合金》2007年第6期485-487,共3页Special Casting & Nonferrous Alloys

基　　金：国家自然科学基金资助项目(50571033);教育部科学技术研究重点项目(104106);合肥工业大学科研发展基金资助项目(040302F)

摘　　要：结合强制冷却方法研究了Sn-30Sb合金在温度诱导液相结构转变前后熔体的凝固行为及其组织的变化。结果表明,在液相结构转变后保温处理的熔体,相对于在液相结构转变前保温时,其凝固时所需过冷度增大,SnSb化合物明显细化,分布弥散化。分析认为,由于在升温至876～1135℃范围时熔体液相结构发生转变,导致熔体中类固型原子团簇被大量打破,熔体结构趋于均匀和无序,抑制了初生相的形核、生长,进而有利于包晶转变的进行,使得凝固组织变化明显。The solidification behavior and microstructure of Sn-30Sb alloy which had been melted below and above the temperature-induced liquid structure transition were observed by forced cooling.The results show that compared with melt at holding temperature before liquid structure transition,the alloy melted above liquid structure transition temperature needs higher supercooling degree during solidification,and SnSb compound phase becomes finer and more dispersive,which is attributed to the debonding of atomic cluster in the melt structure at the liquid structure transition temperature range of 876~1 135 ℃,resulting in the uniform distribution of the melt to inhibit the nucleation and growth of primary,further to promote peritectic reaction and to finally refine the solidification structure.

关 键 词：SN-SB合金 液-液结构转变 凝固组织 

分 类 号：TG111.4[金属学及工艺—物理冶金]