Effect of Y_(2)O_(3) on microstructure and properties of CoCrFeNiTiNb high entropy alloy coating on Ti-6Al-4V surface by laser cladding  

作　　者：Zhen Li Wei Zhao Kedong Yu Ning Guo Guangchun Xiao Zhiming Wang Hui Zhang 

机构地区：[1]College of Mechanical Engineering,Qilu University of Technology(Shandong Academy of Sciences),Jinan,250353,China [2]Shandong Institute of Mechanical Design and Research,Jinan,250031,China

出　　处：《Journal of Rare Earths》2024年第3期586-599,I0006,共15页稀土学报（英文版）

基　　金：Project supported by the National Natural Science Foundation of China(51805285,51605237);the projects of Shandong Province"Youth Innovation Science and Technology Support Plan"(2021KJ026);the Key Research and Development Project of Shandong Province(2018GGX103031);the Natural Science Foundation of Shandong Province(ZR2021ME023)。

摘　　要：The effects of Y_(2)O_(3) on the microstructure, microhardness, wear resistance, high-temperature oxidation resistance, hot corrosion resistance, and electrochemical corrosion behaviour of CoCrFeNiTiNb high entropy alloy coatings formed on Ti-6Al-4V alloy surfaces were studied. The results show that the addition of Y_(2)O_(3) changes the proportion of the phase but does not change its type. The average grain size is only 1/4.7 of that of the high entropy alloy(HEA) coating, and the fine-grained strengthening leads to increases in the microhardness and wear resistance of 21.8% and 26.9%, respectively. The addition of Y_(2)O_(3) enhances the denseness and bonding properties of the oxide and corrosion product layers, reducing the oxidation and hot corrosion rates by 60.3% and 40.3%, respectively. The addition of Y_(2)O_(3) doubles the corrosion resistance which is attributed to the refinement of the grains, the increased proportion of HCP and TiN, and the weakening of galvanic coupling corrosion.

关 键 词：Laser cladding High entropy alloy coatings Rare earths Wear properties High temperature properties Electrochemical corrosion 

分 类 号：TG174.4[金属学及工艺—金属表面处理] TG665[金属学及工艺—金属学]