过冷Cu-40%Pb合金熔体的相选择与偏晶胞形成机制

Phase Selection and Monotectic Cell Formation Mechanism of Undercooled Cu-40%Pb Alloy Melting

采用循环过热与玻璃熔融净化相结合,铜模快淬法制备了不同过冷度的Cu-40%Pb过偏晶合金,结合能谱分析及相关理论,对液相分离初期合金熔体形核竞争进行了研究。结果表明,富Cu的L1相作为优先相首先从合金熔体中液相形核,这是Cu-Pb过偏晶合金熔体在后续凝固过程中的偏晶胞的来源。

The Cu-40%Pb hypermonotectic alloy was prepared by rapid quenching of copper mold, using the combination of cycle overheat and glass melting and purification. Based on the analysis of energy spectrum and related theory, the nucleation competition of liquid phase separation was studied. The results show that the L1 phase of the rich Cu is the first phase from the liquid phase nucleation of the alloy melting, this is the source of the partial monotectic cell in the subsequent solidification process of Cu-Pb hypermonotectic alloy.