Sb, Bi和Fe对Cu-8P共晶合金熔点和组织的影响

来源期刊:中国有色金属学报2004年第7期

论文作者:武玉英 刘相法 刘相俊 边秀房

文章页码:1206 - 1210

关键词:Cu-P基合金;熔点; 组织

Key words:Cu-8P base alloy; melting point; microstructure

摘    要:采用NETZSCH DSC 404型差示扫描量热仪(DSC)、 扫描电子显微镜(SEM)等手段研究了添加元素Sb, Bi和Fe对Cu-8P共晶合金熔点和组织的影响。 实验结果表明: Sb, Bi和Fe均能降低Cu-8P合金的熔点。 一定量的Sb与Cu, P形成低熔点相, 从而大幅降低了Cu-8P合金的熔点, 使其熔点降低近200℃;加入少量Bi后, Bi与Cu在共晶团晶界上形成熔点为270℃左右的低熔点化合物,且Bi的加入明显细化Cu-8P合金共晶团, 从而使Cu-8P合金的熔点降低; 加入Fe能明显细化Cu-8P合金的共晶团, 使层片间距由8μm减为2μm以下,并使共晶团由层片状向短棒状转变, 虽然Fe与Cu形成熔点为806℃的高温相,但Fe的细化作用使得Cu-8P合金的熔点降低, 但降低幅度不大。 同时得出形成低熔点的化合物(相)和细化晶粒是降低合金熔点的有效途径。

Abstract: The effect of Sb, Bi and Fe on the melting points and microstructures of Cu-8P alloys were studied by means of DSC and SEM. It is found that the addition of Sb, Bi and Fe can decrease the melting points of Cu-8P eutectic alloy. Sb can combine with Cu and P to form a low melting point compound which lowers the melting point of binary Cu-8P eutectic alloy by nearly 200℃. Bi and Cu can create compounds with low melting point(270℃) distributing at the boundaries and that is the reason why the melting point of (Cu-8P)-Bi is lower than that of binary Cu-8P eutectic alloy. The eutectic cluster can be refined with the addition of Fe, and that is the reason why the addition of Fe can decrease the melting point of Cu-8P alloy. Two means of decreasing the melting point of Cu-8P are found. One is to form compound with low melting point, the other is to refine the eutectic cluster.

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