C.Y. Cui, L. Feng, X.F. Liu, H.H. Xu, J. Yang, X.G. Cui
{"title":"Al2O3对轻质耐火介质熵合金涂层组织和力学性能的影响","authors":"C.Y. Cui, L. Feng, X.F. Liu, H.H. Xu, J. Yang, X.G. Cui","doi":"10.1016/j.intermet.2025.108918","DOIUrl":null,"url":null,"abstract":"<div><div>Ti<sub>1.5</sub>NbMo<sub>0.5</sub>(Al<sub>2</sub>O<sub>3</sub>)<sub>x</sub> (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. Al<sub>2</sub>O<sub>3</sub>-free coating showed high microhardness (1137.5 HV), 5.7 times that of the substrate, but exhibited increased brittleness. Adding Al<sub>2</sub>O<sub>3</sub> refined the grains, promoted interdendritic phase formation, and improved toughness and molding quality. After annealing at 900 °C, the microhardness of the Ti<sub>1.5</sub>NbMo<sub>0.5</sub>(Al<sub>2</sub>O<sub>3</sub>)<sub>0.6</sub> 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<sub>1.5</sub>NbMo<sub>0.5</sub>(Al<sub>2</sub>O<sub>3</sub>)<sub>0.6</sub> 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.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"185 ","pages":"Article 108918"},"PeriodicalIF":4.8000,"publicationDate":"2025-07-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Effects of Al2O3 on the microstructure and mechanical properties of the lightweight refractory medium entropy alloy coatings\",\"authors\":\"C.Y. Cui, L. Feng, X.F. Liu, H.H. Xu, J. Yang, X.G. Cui\",\"doi\":\"10.1016/j.intermet.2025.108918\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><div>Ti<sub>1.5</sub>NbMo<sub>0.5</sub>(Al<sub>2</sub>O<sub>3</sub>)<sub>x</sub> (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. Al<sub>2</sub>O<sub>3</sub>-free coating showed high microhardness (1137.5 HV), 5.7 times that of the substrate, but exhibited increased brittleness. Adding Al<sub>2</sub>O<sub>3</sub> refined the grains, promoted interdendritic phase formation, and improved toughness and molding quality. After annealing at 900 °C, the microhardness of the Ti<sub>1.5</sub>NbMo<sub>0.5</sub>(Al<sub>2</sub>O<sub>3</sub>)<sub>0.6</sub> 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<sub>1.5</sub>NbMo<sub>0.5</sub>(Al<sub>2</sub>O<sub>3</sub>)<sub>0.6</sub> 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.</div></div>\",\"PeriodicalId\":331,\"journal\":{\"name\":\"Intermetallics\",\"volume\":\"185 \",\"pages\":\"Article 108918\"},\"PeriodicalIF\":4.8000,\"publicationDate\":\"2025-07-17\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Intermetallics\",\"FirstCategoryId\":\"88\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S0966979525002833\",\"RegionNum\":2,\"RegionCategory\":\"材料科学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q2\",\"JCRName\":\"CHEMISTRY, PHYSICAL\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Intermetallics","FirstCategoryId":"88","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0966979525002833","RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"CHEMISTRY, PHYSICAL","Score":null,"Total":0}
Effects of Al2O3 on the microstructure and mechanical properties of the lightweight refractory medium entropy alloy coatings
Ti1.5NbMo0.5(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 Ti1.5NbMo0.5(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 Ti1.5NbMo0.5(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.
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.