Structure and properties of HEA-based coating reinforced with CrB particles

IF 0.4 Q4 METALLURGY & METALLURGICAL ENGINEERING Obrabotka Metallov-Metal Working and Material Science Pub Date : 2023-09-15 DOI:10.17212/1994-6309-2023-25.3-87-103
Alexey Ruktuev, Aleksandr Yurgin, Vladislav Shikalov, Arina Ukhina, Ivan Chakin, Evgeny Domarov, Gleb Dovzhenko
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Abstract

Introduction. Currently, a new class of materials, namely high-entropy alloys, is an active area of research. One of the areas of its application is the fabrication of protective coatings with high performance properties. The high-entropy alloy of CoCrFeNiMn composition is characterized by high ductility, which is retained both at elevated and cryogenic temperatures, as well as high thermal stability and, thus, can be considered as promising materials for protective coatings formation. At the same time, its disadvantages are low hardness and strength. It is known that the reinforcement of the CoCrFeNiMn high-entropy alloy with hardening particles is an effective way to improve the mechanical properties of coatings. It is assumed that the addition of hardening boride particles affects positively on the mechanical characteristics of the alloy. The aim of this work is to study the structural and phase states and wear resistance of coatings based on a CoCrFeNiMn high-entropy alloy reinforced with CrB particles. Coatings obtained by the method of non-vacuum electron-beam surfacing of powder mixtures with different mass ratios of CoCrNiMn metal powders to the CrB powder (100:0, 95:5, 90:10, 80:20, 70:30) are studied in this work. To investigate the structure and phase composition of the coatings, such methods as optical microscopy, scanning electron microscopy and X-ray diffraction analysis were applied. To study the elemental composition, energy-dispersive X-ray analysis was used. The mechanical properties were evaluated based on the microhardness measuring results. The wear resistance of the coatings was determined under conditions of dry sliding friction during reciprocating motion. Results and discussion. The addition of CrB powder to the surfacing mixture led to the formation of eutectic structures. When 5 wt. % CrB was added, a hypoeutectic structure is formed in the coating. An increase in the amount of CrB leads to the formation of coatings with a hypereutectic structure containing primary borides. The main phases found in the coatings are the fcc solid solution, and (Cr,Mn,Fe)2B, (Ni,Co,Mn)2B, CrB borides. All the studied coatings are characterized by an adhesive wear mechanism. The addition of 20 % and 30 % CrB to the surfacing mixture composition results in the wear resistance increase of the high-entropy alloy-based coatings by 3.6 and 6.1 times, respectively.
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CrB颗粒增强hea基涂层的结构与性能
介绍。目前,一类新的材料,即高熵合金,是一个活跃的研究领域。其应用领域之一是制造具有高性能的保护涂层。CoCrFeNiMn组成的高熵合金具有高延展性,在高温和低温下都能保持高的延展性,以及高的热稳定性,因此可以被认为是有前途的保护涂层材料。同时,它的缺点是硬度和强度低。研究表明,用硬化颗粒增强CoCrFeNiMn高熵合金是提高涂层力学性能的有效途径。认为硬化硼化物颗粒的加入对合金的力学性能有积极的影响。研究了CrB颗粒增强CoCrFeNiMn高熵合金涂层的组织、相态和耐磨性。研究了不同质量比的CoCrNiMn金属粉末与CrB粉末(100:0,95:5,90:10,80:20,70:30)的粉末混合物采用非真空电子束堆焊方法制备的涂层。采用光学显微镜、扫描电镜和x射线衍射分析等方法对涂层的结构和相组成进行了研究。为了研究元素组成,采用了能量色散x射线分析。根据显微硬度测试结果评价了材料的力学性能。在往复运动干滑动摩擦条件下测定了涂层的耐磨性。结果和讨论。在堆焊混合物中加入CrB粉末可形成共晶结构。当加入5 wt. % CrB时,涂层中形成亚共晶结构。随着CrB含量的增加,形成了含有初生硼化物的过共晶涂层。涂层中的主要相为fcc固溶体和(Cr,Mn,Fe)2B、(Ni,Co,Mn)2B、CrB硼化物。所研究的涂层均具有粘附磨损机理。在堆焊混合物中添加20%和30%的CrB,可使高熵合金基涂层的耐磨性分别提高3.6倍和6.1倍。
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Obrabotka Metallov-Metal Working and Material Science
Obrabotka Metallov-Metal Working and Material Science METALLURGY & METALLURGICAL ENGINEERING-
CiteScore
1.10
自引率
50.00%
发文量
26
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