Effect of Ti content on structure and properties of Al2CrFeNiCoCuTix high-entropy alloy coatings
Effect of Ti content on structure and properties of Al2CrFeNiCoCuTix high-entropy alloy coatings
复制标题
DOI：
10.1016/j.jallcom.2013.09.083
复制
发表时间：
2014-02
影响因子：
6.2
通讯作者：
Xingwu Qiu;Yun-peng Zhang;Chun-ge Liu
中科院分区：
文献类型：
--
作者：
Xingwu Qiu;Yun-peng Zhang;Chun-ge Liu
采用激光熔覆技术制备了Al2CrFeNiCoCuTix高熵合金涂层。利用金相显微镜、扫描电子显微镜及能谱(SEM/EDS)、X射线衍射仪、显微/维氏硬度计、电化学工作站摩擦磨损试验机和多物理量测试仪对其组织、硬度、耐蚀性、耐磨性和磁性能进行了研究。结果表明，Al2CrFeNiCoCuTix高熵合金样品由熔覆区、边界区、热影响区和基体区组成。熔覆层与基体之间的结合良好；熔覆区主要由等轴晶和柱状晶组成；由于高熵的影响，Al2CrFeNiCoCuTix高熵合金涂层的相结构简单为FCC相、BCC相和Laves相。 Ti元素在一定程度上促进了BCC结构的形成。与Q235钢相比，Al2CrFeNiCoCuTix高熵合金涂层的自由腐蚀电流密度降低了1~2个数量级，自由腐蚀电位更加“正”。随着Ti含量的增加，Al2CrFeCoCuNiTix高熵合金涂层在0.5 mol/L HNO3溶液中的耐腐蚀性能增强。与Q235钢相比，Al2CrFeCoCuNiTix高熵合金涂层的相对耐磨性有较大提高；硬度和塑性都会影响耐磨性。磁化曲线表明，Ti0.0高熵合金是一种软磁材料。
The Al2CrFeNiCoCuTixhigh-entropy alloy coatings were prepared by laser cladding. The structure, hardness, corrosion resistance, wear resistance and magnetic property were studied by metallurgical microscope, scanning electron microscopy with spectroscopy (SEM/EDS), X-ray diffraction, micro/Vickers hardness tester, electrochemical workstation tribometer and multi-physical tester. The result shows that, Al2CrFeNiCoCuTixhigh-entropy alloy samples consist of the cladding zone, bounding zone, heat affected zone and substrate zone. The bonding between the cladding layer and the substrate of a good combination; the cladding zone is composed mainly of equiaxed grains and columnar crystal; the phase structure of Al2CrFeNiCoCuTixhigh-entropy alloy coatings simple for FCC, BCC and Laves phase due to high-entropy affect. Ti element promotes the formation of a BCC structure in a certain extent. Compared with Q235 steel, the free-corrosion current density of Al2CrFeNiCoCuTixhigh-entropy alloy coatings is reduced by 1–2 orders of magnitude, the free-corrosion potential is more “positive”. With the increasing of Ti content, the corrosion resistance of Al2CrFeCoCuNiTixhigh-entropy alloy coatings enhanced in 0.5 mol/L HNO3solution. Compared with Q235 steel, the relative wear resistance of Al2CrFeCoCuNiTixhigh-entropy alloy coatings has improved greatly; both the hardness and plasticity are affecting wear resistance. Magnetization loop shows that, Ti0.0high-entropy alloy is a kind of soft magnetic materials.