文献类型：期刊文献

英文题名：Laser-clad CoCrNi-WC/Nb medium-entropy alloy coatings: A study on microstructure and wear behavior

作者：Jin, Hongtao[1,2];Luo, Yuanzheng[1];Dou, Xiaoxin[1];Huang, Jiang[1,2]

机构：[1]Guangdong Ocean Univ, Coll Elect & Informat Engn, Zhanjiang 524088, Guangdong, Peoples R China;[2]Guangdong Ocean Univ, Guangdong Prov Key Lab Intelligent Equipment South, Zhanjiang 524088, Peoples R China

年份：2027

卷号：751

外文期刊名：APPLIED SURFACE SCIENCE

收录：SCI-EXPANDED(收录号：WOS:001864391000001)、、WOS

基金：This work was supported by the Guangdong Provincial Key Labora-tory of Intelligent Equipment for South China Sea Marine Ranching (Grant No. 2023B1212030003) and the Postgraduate Education Inno-vation Project of Guangdong Ocean University (Grant No. 040502112601) , and we gratefully acknowledge eceshi ( www.eceshi.com ) for the XPS measurements.

语种：英文

外文关键词：Wear resistance; Medium-entropy alloys; Laser cladding; Oxide film

外文摘要：The wear resistance of CoCrNi medium-entropy alloys (MEAs) is often insufficient for demanding applications. To mitigate this limitation, laser cladding (LC) was employed to fabricate CoCrNi-(WC/Nb)x composite coatings (with WC/Nb added in equal proportions, x = 0, 10, 20, 30 wt%). The results indicate that the in-situ formation of NbC, WC, and Cr3Nb3C phases is promoted by the addition of WC/Nb, thereby enhancing the coating's mechanical properties through synergistic mechanisms. The S3 coating, when x = 30, displays optimal mechanical performance, yielding a room-temperature (RT) wear rate of just 0.27 & times; 10-4 mm3/(N & sdot;m). Moreover, under high-temperature (HT) conditions at 600 degrees C, the wear rate is further reduced to 0.12 & times; 10-4 mm3/(N & sdot;m). The improved HT wear resistance arises from the synergy between enhanced oxidation and the self-healing properties of Nb, which together promote the formation of a continuous, dense oxide film. This study systematically analyzes the synergistic strengthening mechanisms of WC/Nb, establishing both an experimental foundation for ultra-high-wear-resistant MEA coatings and new perspectives on multi-component synergistic strengthening strategies.