Study of Cu-base coating on aluminum alloy by laser cladding
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摘要: 为了提高铝合金的表面强度,根据铜合金的液相分离性质,采用CO2激光熔覆方法,在铝合金表面成功制备了铜基合金涂层。结果表明,涂层的基体相为铜基固溶体,强化相主要为呈弥散分布的laves相。涂层中的强化相表现出了"富Mo核心"+"包围相"的复合结构特征,这主要是由于富Mo核心的析出为液相分离提供了异质形核条件所造成的。硬度测试表明,所获涂层的硬度约为270HV0.05,比ZL104铝合金提高了约2倍。Abstract: According to the liquid separation property of Cu-base alloy,the Cu-base coating is obtained on the aluminum alloy by CO2 laser cladding for improving the surface strength of aluminum alloy.The results show that the matrix of the coating is Cu-base solid solution,and the main reinforcing phase is laves phase,which shows a dispersion distribution character.The reinforcing phase shows a composite structure of "Mo-rich core"+"surrounding phase".This is mainly caused by the separation of Mo-rich cores,which furnish the liquid separation with heterogeneity nucleation surface.The microhardness test shows that the microhardness of the coating is about 270HV0.05,two times higher than that of the substrate ZL104 aluminum alloy.
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Keywords:
- laser technique /
- Cu-base alloy /
- laser cladding aluminum alloy /
- microstructure /
- microhardness
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