Effect of Y on the high-temperature oxidation behavior of CrMoTaTi refractory high entropy alloy

被引：28

作者：

Du, Yuhang ^{[1
]}

Ding, Deyu ^{[1
]}

Lai, Limin ^{[1
]}

Xiao, Siming ^{[1
]}

Guo, Ning ^{[1
]}

Song, Bo ^{[1
]}

Guo, Shengfeng ^{[1
]}

机构：

[1] Southwest Univ, Sch Mat & Energy, Chongqing 400715, Peoples R China

来源：

INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS | 2022年 / 103卷

基金：

中国国家自然科学基金;

关键词：

Refractory high-entropy alloys; High-temperature oxidation resistance; Reactive elements; Selective oxidation; SUPERALLOY; MECHANISM; TA;

D O I：

10.1016/j.ijrmhm.2021.105755

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Refractory high-entropy alloys (RHEAs) usually exhibited good mechanical properties at high temperatures. Unfortunately, the very poor high-temperature oxidation resistance was still greatly limited their practical application space. In this work, the effect of the reactive element (RE) Y on the high temperature oxidation resistance of CrMoTaTi RHEA was systematically investigated. It was found that the addition of Y could significantly improve the high-temperature oxidation resistance of CrMoTaTi RHEA. For the Y-bearing RHEAs, they greatly reduced the critical concentration of Cr required for the formation of Cr2O3 on the alloy surface, which was conducive to the rapid formation of Cr2O3 reacting with Ta2O5, resulting the generation of CrTaO4 with a relatively dense and continuous protective layer. The Y-bearing RHEAs exhibited good oxidation resistance even when the alloys were oxidized at 1000 degrees C for 100 h. This work proposed a positive role of the reactive elements and new insights to improve the high-temperature oxidation resistance of RHEAs.

引用

页数：11

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