熔体混合金锡共晶合金非规则共晶组织的形成  

Formation of Anomalous Eutectic Microstructure in Au-Sn Eutectic Alloy Prepared by Melt Mixing

作　　者：郭德燕[1] 宋佳佳[1] 蔡亮[1] 程军[1] 毛勇[1] 

机构地区：[1]云南大学物理科学技术学院材料科学与工程系,云南昆明650091

出　　处：《稀有金属》2013年第2期224-229,共6页Chinese Journal of Rare Metals

基　　金：国家自然科学基金项目(50964014;51161024)资助

摘　　要：采用高低温熔体混合凝固处理,研究了不同高温液相温度380,390和400℃(低温液相温度均为274℃)条件下,金锡共晶合金凝固组织演变规律及非规则共晶组织的形成。研究表明:熔体混合可有效地改变金锡共晶合金的凝固组织结构,随着高温液相温度的提高,合金的凝固组织可以从常规层片状组织转变为块球状的非规则共晶组织,熔体混合金锡共晶合金中非规则共晶组织的形成机制为枝晶熔断机制。The melt treatment by mixing high temperature melt with low temperature melt was adopted to study the solidification mi- crostructure evolution and the formation mechanism of anomalous eutectic microstructures in Au-Sn eutectie alloy. The effect of different temperatures of the high temperature melt, which were 380, 390 and 400 ℃ respectively（ the temperature of the low temperature melt was all 274 ℃ ）, on solidification microstructure was investigated. The results showed that through melt mixing, the morphology of so- lidification microstructure of Au-Sn eutectic alloy could be changed effectively. The conventional lamellar eutectic microstructure trans- formed into the anomalous eutectic microstructure under suitable melt mixing condition. The anomalous eutectic formation by melt mix- ing in the Au-Sn eutectie alloy was explained by dendrite fusing and remehing mechanism.

关 键 词：熔体混合 非规则共晶 凝固组织 共晶合金 

分 类 号：TG146.3[一般工业技术—材料科学与工程]