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为了提高材料表面的耐磨性和高温抗氧化性,在Q235钢表面激光熔覆制备了Mo Fe Cr Ti WSixAly(x=0或1且y=0或1)高熵合金(HEA)涂层,采用X射线衍射仪(XRD)、扫描电镜(SEM)和磨损试验机研究了Si、Al对涂层的组织、相结构、耐磨性及高温抗氧化性能的影响。结果表明,激光熔覆Mo Fe Cr Ti WSixAly高熵合金涂层的主体相均为BCC相,Si、Al的添加均使BCC相的晶格常数减小。当x=0,y=1时,涂层由单一的BCC相组成,组织为细小的树枝晶,但耐磨性较低;当x=1且y=0或1时,涂层中出现少量的金属间化合物,提高了涂层的耐磨性。Mo Fe Cr Ti WSixAly系高熵合金涂层在800℃时的高温抗氧化性能较高,添加Si、Al可进一步提高涂层的高温抗氧化性。
In order to improve the wear resistance and high temperature oxidation resistance of the material surface, a high entropy alloy (HEA) coating with Mo Fe Cr Ti WSixAly (x = 0 or 1 and y = 0 or 1) was prepared by laser cladding on Q235 steel. The effects of Si and Al on the microstructure, phase structure, wear resistance and high temperature oxidation resistance of the coatings were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM) and wear tester. The results show that the main phases of the laser cladding Mo Fe Cr Ti WSixAly high-entropy alloy coating are all BCC phases. The addition of Si and Al both decrease the lattice constant of the BCC phase. When x = 0, y = 1, the coating consisted of a single BCC phase with fine dendrites but lower wear resistance. When x = 1 and y = 0 or 1, a small amount of coating appeared Of the intermetallic compounds, improve the wear resistance of the coating. The high-temperature oxidation resistance of Mo Fe Cr Ti WSixAly high-entropy alloy coating at 800 ℃ is higher. The addition of Si and Al can further improve the high-temperature oxidation resistance of the coating.