Effects of Al2O3 on the microstructure and mechanical properties of the lightweight refractory medium entropy alloy coatings

IF 4.8 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics Pub Date : 2025-07-17 DOI:10.1016/j.intermet.2025.108918

C.Y. Cui, L. Feng, X.F. Liu, H.H. Xu, J. Yang, X.G. Cui

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引用次数: 0

Abstract

Ti_1.5NbMo_0.5(Al₂O₃)_x (x = 0, 0.2, 0.4, 0.6, 0.8, and 1.0) lightweight refractory medium entropy alloy (RMEA) coatings were fabricated on 316 L stainless steel substrates using prefabricated powder laser cladding. The microstructure of the coatings primarily consisted of BCC and Laves phases. Al₂O₃-free coating showed high microhardness (1137.5 HV), 5.7 times that of the substrate, but exhibited increased brittleness. Adding Al₂O₃ refined the grains, promoted interdendritic phase formation, and improved toughness and molding quality. After annealing at 900 °C, the microhardness of the Ti_1.5NbMo_0.5(Al₂O₃)_0.6 coating showed only a 2.07 % reduction, indicating superior high-temperature stability. The wear resistance of the coatings improved significantly, with the lowest friction coefficient observed in the Ti_1.5NbMo_0.5(Al₂O₃)_0.6 coating (0.491) before annealing, and a further reduction of 33.71 % after annealing. The wear mechanism was attributed to the formation of oxide layers, reducing direct contact between the friction pair and the coating.

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Al2O3对轻质耐火介质熵合金涂层组织和力学性能的影响

采用预制粉末激光熔覆技术在316 L不锈钢基体上制备了Ti1.5NbMo0.5(Al2O3)x （x = 0、0.2、0.4、0.6、0.8和1.0）轻质耐火介质熵合金（RMEA）涂层。涂层组织主要由BCC相和Laves相组成。无al2o3涂层具有较高的显微硬度（1137.5 HV），是基体的5.7倍，但脆性有所增加。Al2O3的加入细化了晶粒，促进了枝晶间相的形成，提高了韧性和成型质量。900℃退火后，Ti1.5NbMo0.5(Al2O3)0.6涂层的显微硬度仅下降了2.07%，表现出优异的高温稳定性。涂层的耐磨性显著提高，退火前Ti1.5NbMo0.5(Al2O3)0.6涂层的摩擦系数最低，为0.491，退火后摩擦系数进一步降低33.71%。磨损机制归因于氧化层的形成，减少了摩擦副与涂层之间的直接接触。

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来源期刊

Intermetallics 工程技术-材料科学：综合

CiteScore

7.80

自引率

9.10%

发文量

291

审稿时长

37 days

期刊介绍： This journal is a platform for publishing innovative research and overviews for advancing our understanding of the structure, property, and functionality of complex metallic alloys, including intermetallics, metallic glasses, and high entropy alloys. The journal reports the science and engineering of metallic materials in the following aspects: Theories and experiments which address the relationship between property and structure in all length scales. Physical modeling and numerical simulations which provide a comprehensive understanding of experimental observations. Stimulated methodologies to characterize the structure and chemistry of materials that correlate the properties. Technological applications resulting from the understanding of property-structure relationship in materials. Novel and cutting-edge results warranting rapid communication. The journal also publishes special issues on selected topics and overviews by invitation only.