不同冷却速率下包晶合金Al_3Ni凝固组织的变化  

Solidification of Al_3Ni Peritectic Alloy at Different Cooling Velocity

作　　者：孙建俊[1] 田卫星[1] 侯纪新[1] 郑洪亮 国宏轩[1] 陈熙琛[1] 田学雷[1] 

机构地区：[1]山东大学材料液态结构及其遗传性教育部重点试验室,山东济南250061

出　　处：《铸造》2005年第6期553-555,共3页Foundry

基　　金：国家自然科学基金项目(编号50271037)。

摘　　要：利用真空电弧炉制备了Al3Ni合金,在水冷铜坩埚中冷却和利用差示量热扫描分析仪(DSC)控制以20℃/min的速度冷却得到不同的合金试样,利用扫描电镜(SEM)和能谱分析(EDS)等手段,对这两种冷却条件下的Al3Ni合金的显微组织和微区成分进行了分析,研究表明,与强制冷却相比,以20℃/min的冷却速度凝固时凝固组织出现异常,先析出相Al3Ni2组织变粗大,相对比例增加14.72%;包晶相Al3Ni只在先析出相周围很窄的范围内存在,相对比例减少31.21%。Al3Ni key alloy was prepared with vacuum arc furnace, and two Al3Ni samples were cooled in water cooled copper crucible and in differential scanning calorimeter at different cooling velocity. Their microscopic structure and micro-area chemical constitution were analyzed using DSC, SEM and EDS. The results showed that peritectic reactions in Al3Ni alloy was prevented. Compared with microscopic structure in water cooled copper crucible, in differential scanning calorimeter at 20°C/min cooling velocity, the microscopic structure of Al3Ni2 is coarser 14.72% and the microscopic structure of Al3Ni is finer 31.21%, this phenomenon is abnormal.

关 键 词：Ni—Al合金 凝同 组织 成分 

分 类 号：TG111.4[金属学及工艺—物理冶金]