【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%。更多还原

【Abstract】 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 /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.更多还原