Microstructural characterization and corrosion behaviour of AlCoCrFeNiTix high-entropy alloy coatings fabricated by laser cladding
Microstructural characterization and corrosion behaviour of AlCoCrFeNiTix high-entropy alloy coatings fabricated by laser cladding
复制标题
DOI：
10.1016/j.surfcoat.2019.01.044
复制
发表时间：
2019-03-15
影响因子：
5.4
通讯作者：
Hao, Jingbin
中科院分区：
文献类型：
--
作者：
Liu, Jian;Liu, Hao;Hao, Jingbin
采用激光熔覆技术在AISI 1045钢表面制备了AlCoCrFeNiTix（x = 0，0.2，0.4，0.6，0.8，1.0）高熵合金涂层。采用X射线衍射（XRD）分析了涂层的相组成。利用扫描电镜（SEM）和透射电镜（TEM）分析了涂层的微观结构。采用X射线衍射（XRD）分析了涂层的相组成。研究了涂层和基体的动电位极化行为。用X射线光电子能谱（XPS）分析了涂层腐蚀表面钝化膜的组成。相组成分析表明，涂层主要由无序体心立方（BCC）固溶体相（Fe-Cr）和有序体心立方相（Al-Ni）组成。涂层组织主要由等轴多边形晶粒、微纳米TiC颗粒和纳米Al 2 O3颗粒组成。晶粒中存在Fe-Cr富集和Al-Ni-Ti富集的调幅分解结构。Ti的引入导致了涂层在腐蚀过程中的钝化行为。钝化膜的成分为Al_2O_3、TiO_2、Ti_2O_3、Cr_2O_3和Cr（OH）_3。AlCoCrFeNiTi HEA涂层的耐蚀性最好。
High-entropy alloy (HEA) coatings of AlCoCrFeNiTix (x = 0, 0.2, 0.4, 0.6, 0.8, 1.0) were fabricated on AISI1045 steel by laser cladding. X-Ray diffraction (XRD) was used to investigate the phase composition of the coatings. The microstructure of coatings was analyzed using a scanning electron microscopy (SEM) and transmission electron microscopy (TEM). X-Ray diffraction (XRD) was used to investigate the phase composition of the coatings. The potentiodynamic polarization behaviour of coatings and substrate was studied. The composition of passive film on the corroded surface of the coating was identified by X-Ray photoelectron spectroscopy (XPS). The phase composition analysis showed that the coating was mainly composed of disordered body-centered cubic (BCC) solid solution phase (Fe-Cr) and ordered BCC phase (Al-Ni). The microstructure of the coatings was mainly composed of equiaxed polygonal grains, micro-nano particles of TiC and nanoparticles of Al2O3. The spinodal decomposition structure of Fe-Cr enrichment and Al-Ni-Ti enrichment was found in grains. The introduction of Ti led to passivation behavior of the coating during corrosion process. The components of the passive film were Al2O3, TiO2, Ti2O3, Cr2O3 and Cr(OH)(3). The AlCoCrFeNiTi HEA coating showed the best corrosion resistance.