Al-Bi-Ce-Cu难混溶合金的凝固组织和耐磨性

The microstructure and wear resistance of Al-Bi-Ce-Cu immiscible alloys

摘要:

本文研究了Al-Bi-Ce-Cu难混溶合金的凝固组织和耐磨性能。实验结果表明,添加Ce到Al-Bi合金中,原位生成的棒状化合物Bi₂Ce作为异质形核质点,促进了Bi相的形核,所制备难混溶合金中富Bi相颗粒弥散分布。添加Cu到Al-Bi-Ce合金中生成了硬质相Al₂Cu,硬质相增强了基体的硬度,进而提高了合金的耐磨性能,降低了合金的耐磨性系数。因此Al-Bi-Ce-Cu合金,不仅具有富Bi相颗粒弥散分布的组织,同时还具有高的耐磨性能,有很强的实际应用价值。

Abstract:

Immiscible alloys have been investigated as a kind of alloys with special metallurgy characteristics. Liquid phase separation of Al-Bi immiscible alloys has been investigated for decades. In this work, the microstructure and the wear resistance of Al-Bi-Ce-Cu alloys were investigated. The intermetallic compounds Bi₂Ce form and act as heterogeneous nucleation sites of Bi-rich droplets, which promote the nucleation of Bi phase and obtain a dispersed microstructure. The intermetallic compound Al₂Cu locate in the Al-rich matrix and enhance the hardness of matrix. The wear resistance of alloys is not only dependent on the size of Bi-rich droplets but also dependent on the hardness of matrix. The refined microstructure and the strengthened hardness improve the wear resistance of Al-Bi alloys. Therefore, Al-Bi-Ce-Cu immiscible alloys is useful as a wear resistance material.