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.
Effect of Sb, Bi and Fe on melting points and microstructures of eutectic Cu-8P alloys
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.