Al65Bi28Cu7偏晶合金的液-液相分离及凝固行为  

Liquid-liquid phase separation and solidification behavior of Al65Bi28Cu7 monotectic alloy

作　　者：张娜[1] 于延军[1] 王玉青[1] 赵德刚[2] ZHANG Na;YU Yanjun;WANG Yuqing;ZHAO Degang(Shandong Polytechnic,Jinan 250104,Shandong,China;School of Materials Science and Engineering,University of Jinan,Jinan 250022,Shandong,China)

机构地区：[1]山东职业学院,山东济南250104 [2]济南大学材料科学与工程学院,山东济南250022

出　　处：《山东大学学报（工学版）》2020年第1期123-128,共6页Journal of Shandong University（Engineering Science）

基　　金：山东职业学院科研基金资助项目(KY-XY-201717)。

摘　　要：利用电阻率法研究铜模冷却条件下Al65Bi28Cu7偏晶合金的液-液相分离过程,并分析Al65Bi28Cu7偏晶合金核壳结构的形成机理。研究结果表明,电阻率与温度关系曲线(ρ-T曲线)的异常变化证实了Al65Bi28Cu7偏晶合金熔体的凝固先后经历了液-液相分离、偏晶反应和共晶反应,在偏晶反应温度以上ρ-T曲线出现的非线性变化主要来源于熔体内的浓度起伏。Al65Bi28Cu7偏晶合金能够形成富Bi相包裹富Al相的核壳结构。The liquid-liquid phase separation of Al65Bi28Cu7 monotectic alloy melt cast in copper mould was investigated by resistivity method.The formation mechanism of core-shell structure of Al65Bi28Cu7 monotectic alloy was discussed.The results showed that the anomalous changes inρ-T curve confirmed the occurrence of liquid phase separation,monotectic reaction and eutectic reaction in the solidification of Al65Bi28Cu7 monotectic alloy melt.The anomalous change above monotectic temperature inρ-T curve should be attributed to the concentration fluctuation of melt.The core-shell structure of Al-rich core covered by Bi-rich could form in the Al65Bi28Cu7 monotectic alloy.

关 键 词：偏晶合金 液相分离 电阻率法 凝固 

分 类 号：TG146.2[一般工业技术—材料科学与工程]