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利用Al70Bi11Sn19难混溶合金,基于相分离制备了Al/Sn-Bi核壳型颗粒.利用SEM,EDS和DSC研究了颗粒的组织形貌、成分和相变行为,并结合温度场模拟,探讨了核壳形貌的形成机理.结果表明,合金颗粒以具有良好导电导热性的铝合金为内核,以Sn-Bi亚共晶无铅合金为壳层,表现出两阶段熔化特征;随粒径从0.5 mm增大到0.9 mm,核壳形貌从多核月偏食型向单核同心型及月偏食型转变,这是由于表面偏析、Marangoni和Stokes运动、Ostwald熟化以及冷速等多种因素相互竞争的综合作用.

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