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通过预置法实现在921A钢上激光熔覆制备高熵合金Al1.3FeCoNiCuCr涂层,研究了以Mn为杂质元素时,不同添加量对高熵合金组织、相结构和性能的影响。结果表明,单纯Al1.3FeCoNiCuCr微观组织为简单的枝晶组织,涂层仅由bcc相和fcc相组成,没有金属间化合物。随着Mn的增加,Al、Ni和Cu的含量相应提高,Fe和Cr的含量则逐渐降低,总体趋向于更加接近设计的成分;和所有其它元素不同之处是,Al明显偏析于枝晶内。XRD分析发现,bcc相的相对强度随Mn的增加而下降,当Mn添加量达到w(Mn)=3%时,bcc相基本消失。此外,Al1.3FeCoNiCuCr涂层显微硬度随着Mn含量的增加小幅降低,当Mn添加量由0增加到w(Mn)=4%时,其平均显微硬度由HV0.2 581逐渐降低到HV0.2 547。
The high entropy alloy Al1.3FeCoNiCuCr coating was prepared by laser cladding on 921A steel and the effect of different addition amount on the microstructure, phase structure and properties of high-entropy alloy was studied when Mn was used as the impurity element. The results show that the simple Al1.3FeCoNiCuCr microstructure is a simple dendritic structure, the coating consists of only bcc phase and fcc phase, there is no intermetallic compound. With the increase of Mn, the content of Al, Ni and Cu increased accordingly, while the content of Fe and Cr decreased gradually, and tended to be closer to the designed composition as a whole. The difference with all the other elements was that Al obviously segregated within the dendrite . XRD analysis showed that the relative strength of bcc phase decreased with the increase of Mn, and the bcc phase disappeared when the Mn addition reached 3%. In addition, the microhardness of Al1.3FeCoNiCuCr coatings decreased slightly with the increase of Mn content. The average microhardness of Al1.3FeCoNiCuCr coatings decreased gradually from HV0.2581 to HV0 when the content of Mn increased from 0 to w (Mn) = 4% .2 547.