Sn-70Bi合金熔体结构转变的可逆性及其凝固行为  

Reversibility of the Liquid-liquid Structure Transition in Sn-70Bi Alloy and its Solidification Behavior

作　　者：周兵[1] 祖方遒[1] 杨树斌 邵春文 刘小毛 那庆阳 

机构地区：[1]合肥工业大学材料科学与工程学院 [2]广东省特种设备检测院顺德分院

出　　处：《特种铸造及有色合金》2008年第2期160-162,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基金资助项目(104106)

摘　　要：利用直流四电极法研究了Sn-70Bi合金在液相线以上数百度温度范围内发生的熔体结构转变;在此基础上,进一步探讨了熔体结构转变的可逆性及其对凝固的影响。试验结果表明,Sn-70Bi合金所发生的熔体结构转变部分可逆,分析认为主要与Sn的熔体结构有关,且熔体结构转变对其凝固行为及组织有较大的影响。发现结构变化后的熔体凝固过冷度显著增大,初生相和共晶相组织明显细化。The liquid-liquid structure transition of the Sn-70Bi alloy at more than liquidus in range of hundreds temperature has been investigated by direct current four-probe method.The reversibility of liquid-liquid structure transition and its influence on the solidification of Sn-70Bi alloy have been analyzed based on above mentioned result.It was found that the liquid-liquid structure transition of Sn-70Bi alloy exhibits partial reversibility,which is mainly related to the Sn molten structure,and the structure transition has obviously affect the solidification behavior and microstructure of the Sn-70Bi alloy.The under-cooling degree of the liquid-liquid structure transition melt can be greatly increased,which obviously refine the primary phase and eutectic phase.

关 键 词：液-液结构转变 过冷度 凝固行为 Sn-70Bi合金 

分 类 号：TG111.4[金属学及工艺—物理冶金]