熔体过热处理对SnAg3Te5合金凝固组织的影响  

Effect of Different Melt Overheating Treatments on Solidification Structures of SnAg3Te5 Alloy

作　　者：吕雪[1] 李先芬[2] 祖方遒[2] 赵振兴[2] 

机构地区：[1]安徽三联学院,安徽合肥230601 [2]合肥工业大学材料科学与工程学院,安徽合肥230009

出　　处：《金属功能材料》2012年第2期12-17,共6页Metallic Functional Materials

摘　　要：本文以直流四电极法、热分析法分别测量了SnAg3Te5合金熔体的电阻率-温度曲线及热分析曲线。结果表明:在连续两轮的升降温过程中,合金熔体的电阻率在远高于液相线几百度的温区内发生了不可逆转变,不同热历史下相同成分合金的热分析曲线也存在明显差异。同时,在不同冷却方式下转变前后的合金凝固组织都发生了显著变化,这些差别充分表明,SnAg3Te5合金熔体在升降温过程中的某个特定温度区间内,由于熔体内部化学短程序的打破或重组而发生了温度诱导的液态结构转变。In this paper, the resistivity and thermal analysis of the liquid SnAg3Te5 alloy as the function of temperature were simultaneously investigated. Some abnormal phenomena were observed on both p-T and T-t curves within certain temperature range. And through differential cooling treatments, it is found that different changes on melt so-lidification structures are caused in the same conditions. These all indicate that the occurrence of structure transition is in liquid SnAg3Te5 alloy. For this abnormal phenomenon, it was assumed that some chemical short-range orders breaking or rebuilding are caused in the melt.

关 键 词：液态结构转变 电阻率 热分析法 凝固组织 SnAg3Te5合金 

分 类 号：TG166[金属学及工艺—热处理]