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激光制备高熵合金涂层对于拓展性能优异的高熵合金在表面改性中的应用具有重要意义。采用激光熔覆的方法,在45~#钢基体上制备了成形良好的AlCoCrNiMo涂层,证实了激光制备AlCoCrNiMo高熵合金涂层的可行性,并研究了激光熔覆工艺参数和Al含量对A1CoCrNiMo高熵合金涂层的成形质量、微观组织结构、硬度的影响规律。结果表明,在无保护气体、涂覆厚度较薄、能量密度适宜时,可以得到成形质量良好的AlCoCrNiMo高熵合金涂层;涂层组织由共晶体和网状联接物组成,平均硬度在950～1250HV_(0.2)之间,在800℃下仍能保持700HV_5的硬度,随着工艺参数的不同,涂层的组织、硬度会有一定的差异;随着Al含量的增加,Al_xCoCrNiMo涂层的相结构变得简单,网状联接物的耐腐蚀相减少,硬度降低,但涂层的硬度始终在950HV_(0.2)以上。
Laser preparation of high-entropy alloy coating is of great significance for the application of high-entropy alloys with excellent properties in surface modification. The laser cladding method was used to fabricate a well-formed AlCoCrNiMo coating on 45 ~ # steel substrate. The feasibility of laser cladding AlCoCrNiMo high-entropy alloy coating was verified. The effect of laser cladding process parameters and Al content on AlCoCrNiMo High entropy alloy coating forming quality, microstructure and hardness of the law. The results show that the high-quality AlCoCrNiMo high entropy alloy coating can be obtained when the shielding gas is not applied, the coating thickness is thin and the energy density is suitable. The coating consists of eutectic and reticular linker with the average hardness of 950 ~ 1250HV_ (0.2), the hardness of 700HV_5 can be maintained at 800 ℃. The microstructure and hardness of the coating will be different with the different process parameters. With the increase of Al content, the phase structure of Al_xCoCrNiMo coating It becomes simple, the corrosion resistance of the network joint decreases, the hardness decreases, but the coating hardness is always above 950HV_ (0.2).