高熵合金涂层的研究进展

高熵合金涂层在工程实际应用中较传统合金具有良好的前景,对近年来高熵合金涂层的研究进展进行了概述。首先对制备高熵合金涂层的表面熔覆技术进行详细的介绍,其中包括激光熔覆技术、等离子熔覆技术、氩弧熔覆技术,分析了各表面熔覆技术的优缺点;然后总结了高熵合金涂层的组织及性能特征,涂层中相的组成包括:固溶体相、金属间化合物、纳米析出相、非晶相;性能上,高熵合金涂层由于各种效应的作用,具有高强度及硬度、优异的耐磨性、良好的耐腐蚀性及高温抗氧化性等一系列优异的性能;而后进一步分析了表面熔覆技术工艺参数对高熵合金涂层质量的影响规律、合金元素对高熵合金涂层性能的影响及热处理对高熵合金涂层相组织演变的影响;最后对高熵合金涂层的应用前景及其未来的研究方向进行展望。

Research progress of high-entropy alloy coating

The high-entropy alloy coating has a better prospect than traditional alloys in practical engineering applications. The research progress of high-entropy alloy coatings in recent years was summarized. First, the surface cladding technology for preparing high-entropy alloy coatings is introduced in detail, including laser cladding technology, plasma cladding technology, and argon arc cladding technology, and the advantages and disadvantages of each surface cladding technology were analyzed. Then the structure and performance characteristics of the high-entropy alloy coating were summarized. The composition of the phase in the coating includes: solid solution phase, intermetallic compound, nano-precipitated phase, and amorphous phase. High-entropy alloy coating has a series of excellent properties such as high strength and hardness, excellent wear resistance, good corrosion resistance and high temperature oxidation resistance due to various effects. Further, the effect of surface cladding process parameters on quality, the effect of alloying elements on properties and the effect of heat treatment on phase structure evolution were analyzed. Finally, the application prospects and future research directions of high-entropy alloy coatings were prospected.