含B量对激光熔覆FeCoCrNiB_x(x=0.5,0.75,1.0,1.25)高熵合金涂层组织结构与耐磨性的影响

采用激光熔覆技术制备FeCoCrNiBx高熵合金涂层,用X射线衍射(XRD)、扫描电镜(SEM)、硬度和耐磨测试等方法,研究了B含量对激光熔覆FeCoCrNiBx高熵合金涂层的组织结构、硬度和耐磨性能的影响。结果表明,随B含量的增加,合金相结构逐渐由fcc固溶体结构转变为fcc固溶体和M3B相共存,M3B相主要为Cr、Fe硼化物。随B含量的增加,枝晶组织中析出颗粒状和短棒状的M3B相,且M3B相逐渐长大成长条状。B的增加显著提高合金涂层的硬度,由4470 MPa增加到8480 MPa,且磨损量随着B的增加而减少。

Effect of Boron Addition on the Microstructure and Wear Resistance of FeCoCrNiBx (x=0.5, 0.75, 1.0, 1.25) High-Entropy alloy Coating Prepared by Laser Cladding

The FeCoCrNiBx high-entropy alloy coatings were prepared by laser cladding. The effect of boron addition on microstructure, hardness and wear resistance of FeCoCrNiBx high-entropy alloy coating were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), hardness and wear testers. The results show that with the boron addition increasing, the structure of alloys change from fcc structure to fcc structure with M3B phase precipitation, and M3B phase are mainly borides of Cr and Fe. Meanwhile, the granular and short rod-like M3B phase is precipitated in the coatings. And a blocky M3B phase forms with boron addition. Microhardness and wear resistance are significantly enhanced by the formation M3B phase. The microhardness increases from 4470 to 8480 MPa, and the wear-loss of FeCoCrNiBx high-entropy alloy coating decrease with boron addition