High-temperature oxidation properties of economical and lightweight Fe-Cr-Ni-Al medium-entropy alloy

被引：23

作者：

Hwang, Yu-Jin ^{[1
]}

Kim, Kyu-Sik ^{[1
,2
]}

Na, Young Sang ^{[3
]}

Lim, Ka Ram ^{[3
]}

Lee, Kee-Ahn ^{[1
]}

机构：

[1] Inha Univ, Dept Mat Sci & Engn, Incheon 22212, South Korea

[2] Agcy Def Dev, Def Mat & Energy Technol Ctr Team 2, Daejeon 34186, South Korea

[3] Korea Inst Mat Sci, Dept Special Alloy, Chang Won 51508, South Korea

来源：

CORROSION SCIENCE | 2023年 / 219卷

基金：

新加坡国家研究基金会;

关键词：

Lightweight; Medium entropy alloy; High-temperature Oxidation property; Microstructure; Oxidation mechanism; MECHANICAL-PROPERTIES; ISOTHERMAL OXIDATION; ALUMINUM-ALLOYS; BEHAVIOR; SUPERALLOY; CHROMIUM; SCALES; MICROSTRUCTURE; DIFFUSION; KINETICS;

D O I：

10.1016/j.corsci.2023.111231

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

This study investigated the microstructure, high-temperature oxidation properties and mechanism of non-equiatomic Fe-Cr-Ni-Al medium entropy alloy (MEA). Microstructural observation of MEA identified coarse grains of mm scale, and cuboidal precipitates with an average size of 125 nm were evenly distributed within grains. Phase analysis confirmed that the alloy consisted of a Fe-Cr matrix (BCC structure) and B2 Ni-Al pre-cipitate. High temperature isothermal oxidation tests measured oxidation weight of 0.08 mg/cm2 at 800 degrees C, 0.17 mg/cm2 at 900 degrees C, 0.22 mg/cm2 at 1000 degrees C, and 0.47 mg/cm2 at 1100 degrees C. Compared to other alloys tested with similar conditions, Fe-Cr-Ni-Al MEA presented by this study achieves economic benefits with relatively excellent high-temperature oxidation resistance. The outstanding high-temperature oxidation resistance of the MEA pre-sented by this study is due to the evenly distributed dense stable Al2O3 layer formed regardless of temperature conditions. In addition, the alloy did not have breakaway oxidation, which can occur as oxidation progresses.

引用

页数：12

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