High-temperature oxidation behavior of a cast Ti-47.5Al-2.5V-1.0Cr-0.2Zr alloy

作     者：Xue-jian Lin Hong-jun Huang Xiao-guang Yuan Yin-xiao Wang Bo-wen Zheng Xiao-jiao Zuo Ge Zhou Xue-jian Lin;Hong-jun Huang;Xiao-guang Yuan;Yin-xiao Wang;Bo-wen Zheng;Xiao-jiao Zuo;Ge Zhou

作者机构：School of Materials Science and EngineeringShenyang University of TechnologyShenyang 110870China 

出 版 物：《China Foundry》 (中国铸造（英文版）)

年 卷 期：2022年第19卷第5期

页      面：443-454页

核心收录：

学科分类：08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

基　　金：financially supported by the National Natural Science Foundation of China (51805335) 

主　　题：cast TiAl alloy high temperature oxidation oxidation film oxidation behavior 

摘      要：The oxidation behavior of the Ti-47.5Al-2.5V-1.0Cr-0.2Zr alloy at 900℃ was investigated at different oxidation times(5,20,60 and 100 h).The results show that the total weight gain of the alloy after 100 h at 900℃ oxidation is 9.1 g·m^(-2),and the oxidation rate decreases with oxidation *** oxides on the alloy surface are mainly TiO_(2) and Al_(2)O_(3).At the beginning of oxidation(5 h),the oxide film is relatively complete,thin,and the interface between the oxide layer and the matrix is virtually *** the end of oxidation(100 h),the thickness of the oxide film is expanded,cracking and spalling occur,and the spalling form is intra-film *** the same time,oxygen is mainly distributed in the oxide film and the oxygen content in the alloy substrate is reduced,confirming that the TiAl alloy has a certain oxidation stability at 900℃.From the outer surface of the oxide layer to the matrix,the TiO_(2) content increases and the Al_(2)O_(3) content *** proceeds to completion in this system via the dissolution and diffusion of O atom.