Microstructure and wear behavior of FeCoNiCrMn high entropy alloy coating deposited by plasma spraying
Microstructure and wear behavior of FeCoNiCrMn high entropy alloy coating deposited by plasma spraying
复制标题
等离子喷涂FeCoNiCrMn高熵合金涂层的显微组织与磨损行为
DOI：
10.1016/j.surfcoat.2020.125430
复制
发表时间：
2020-03-15
影响因子：
5.4
通讯作者：
Zhang, Chao
中科院分区：
文献类型：
--
作者：
Xiao, Jin-Kun;Tan, Hong;Zhang, Chao
采用大气等离子喷涂技术，在不同氢气流量下在钢表面制备了FeCoNiCrMn高熵合金涂层，并对涂层进行了退火处理。研究了所制备涂层的组织和相组成，并测定了涂层的硬度。在干滑动条件下，研究了喷涂态和退火态FeCoNiCrMn涂层与WC-Co球的摩擦磨损行为。结果表明，由于锰元素的挥发和氧化，涂层表面形成了蓬松的结构。涂层为单一的面心立方相，并伴有少量氧化物。当氢气流量从3 L/min增加到6 L/min时，涂层的磨损率降低了一半。热处理可显著提高喷涂层的耐磨性和抗划痕性。磨损轨迹分析表明，溅射剥落是涂层的主要磨损机制。提高氢气流量和退火处理可以提高涂层的耐磨性，这主要是由于涂层结合强度的提高所致。
FeCoNiCrMn high entropy alloy coatings were deposited on steel substrate by atmospheric plasma spraying at different H-2 flow rates and subsequently annealed. The microstructure and the phase composition of the prepared coatings were investigated, and the hardness of the coating was determined. The wear behavior of the as-sprayed and annealed FeCoNiCrMn coatings against WC-Co ball was evaluated under dry sliding condition. The results show that the fluffy structures characterized on the surfaces of as-sprayed coatings were formed due to the volatilization and oxidation of Mn element. The coatings were single FCC phase along with some oxides. The wear rate of the as-sprayed coatings was reduced by half as the H-2 flow rate increasing from 3 to 6 L/min. Annealing can greatly improve the wear resistance and scratch resistance of the as-sprayed coatings. The characterization of wear tracks demonstrates that splat spalling was the dominating wear mechanism for the assprayed coatings. The improvement of wear resistance by increasing H-2 flow rate and annealing was attributed to the enhancement of cohesive strength among splats.