Insight into the high-temperature tribological mechanism of VAlTiCrW high entropy alloy film:AlV_(3)O_(9)from tribochemistry  

作　　者：Xuesong LIU Jun FAN Jibin PU Zhaoxia LU 

机构地区：[1]College of Chemistry and Chemical Engineering,Guangxi University,Nanning 530004,China [2]Key Laboratory of Marine Materials and Related Technologies,Key Laboratory of Marine Materials and Protective Technologies of Zhejiang Province,Ningbo Institute of Materials Technology and Engineering,Chinese Academy of Sciences,Ningbo 315201,China

出　　处：《Friction》2023年第7期1165-1176,共12页摩擦（英文版）

基　　金：supported by the National Key R&D Program of China(No.2018YFB2000300);the Zhejiang Provincial Natural Science Foundation(No.LR20E050001);the National Science and the Technology Major Project(No.2017-VII-0013-0110);National Natural Science Foundation of China(No.51775539).

摘　　要：High-entropy alloys have made significant progress in high mechanical properties,wear resistance,and corrosion resistance properties.Excellent tribological properties,especially high-temperature lubrication,have become another sought performance.In this work,VAlTiCrW high-entropy alloy film with body-centered cubic(BCC)structure was prepared on superalloy substrate by magnetron sputtering.It is found that the VAlTiCrW film shows very low friction coefficient of 0.15 and a low wear rate of 10^(-5) orders of magnitude at 800℃.After 800℃oxidation,the film can still obtain a friction coefficient of no more than 0.2 at 700℃.XRD and TEM revealed the formation of ternary oxide AlV_(3)O_(9)with preferred orientation of(002)crystal plane with large spacing of 0.71 nm on the wear surface of the film,a high-temperature lubricating phase that has not been reported,realizes the low friction coefficient.This AlV_(3)O_(9)can be formed by tribochemical reaction under the thermal-mechanical action at 700℃,but pre-oxidation at 800℃is the prerequisite in order to form the precursors of V-rich and Al-rich oxide layer.

关 键 词：high entropy alloy high temperature friction AlV_(3)O_(9) OXIDE 

分 类 号：TG139[一般工业技术—材料科学与工程]