AlCoCrFeNiCu0.5高熵合金在800℃和900℃下的氧化行为

IF 4 3区 材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY
Xu Chen, Qihan Li, Ye Liu, Lin Zhang, Shuang He, Oleg I. Gorbatov, Xuanhui Qu
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引用次数: 0

摘要

分析了AlCoCrFeNiCu0.5高熵合金(HEA)在800℃和900℃空气中的氧化行为,并研究了氧化后相应的组织演变。实验研究表明,铸态AlCoCrFeNiCu0.5合金主要由BCC相和FCC相组成,并存在由NiAl-B2相和FeCr-BCC相组成的独立结构。900℃退火6 h后,晶界处存在σ相,但spinodal组织消失。氧化引起了合金基体的显著变化。氧化基体的主要相为NiAl-B2相和FeCoCr-FCC1相。大量Al在基体中被消耗,在基体表面形成Al2O3,形成贫Al层。氧化时间越长,贫al层越厚,富cu的FCC2相在该区域集中分布。合金在800℃和900℃的等温氧化动力学遵循抛物线定律。800℃和900℃氧化的kp值分别为7.367 × 10−14 (g2·cm−4·s−1)和2.105 × 10−13 (g2·cm−4·s−1),表明900℃时的kp值是800℃时的2.86倍。在两种温度下,表面连续的Al2O3层是HEA具有优异抗氧化性能的关键。图形抽象
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Oxidation Behavior of the AlCoCrFeNiCu0.5 High-Entropy Alloy at 800 °C and 900 °C

Oxidation Behavior of the AlCoCrFeNiCu0.5 High-Entropy Alloy at 800 °C and 900 °C

The oxidation behavior of AlCoCrFeNiCu0.5 high-entropy alloy (HEA) in air at both 800 °C and 900 °C has been analyzed and corresponding microstructural evolution after oxidation has also been studied. The experimental studies revealed that the as-cast AlCoCrFeNiCu0.5 alloy is mainly composed of BCC and FCC phases, moreover, there is a spinodal structure with the constituent phases being NiAl-B2 and FeCr-BCC. After annealing at 900 °C for 6 h, the spinodal structure disappeared, but there was σ phase at grain boundary. Oxidation caused significant changes in the matrix of the alloy. The primary phases of the oxidized matrix are the NiAl-B2 phase and FeCoCr-FCC1 phase. A substantial amount of Al was consumed in matrix to form Al2O3 on the surface, resulting in the formation of Al-depleted layer. The longer the oxidation time, the thicker the Al-depleted layer, and a concentrated distribution of Cu-rich FCC2 phase was observed in this region. The isothermal oxidation kinetics of the alloy at both 800 °C and 900 °C followed the parabolic law. The kp values for oxidation at 800 °C and 900 °C were 7.367 × 10− 14 (g2·cm− 4·s− 1) and 2.105 × 10− 13 (g2·cm− 4·s− 1) respectively, indicating that the kp value at 900 °C was 2.86 times that at 800 °C. A continuous Al2O3 layer on the surface being the key to its superior oxidation resistance of the HEA at both temperatures.

Graphical Abstract

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来源期刊
Metals and Materials International
Metals and Materials International 工程技术-材料科学:综合
CiteScore
7.10
自引率
8.60%
发文量
197
审稿时长
3.7 months
期刊介绍: Metals and Materials International publishes original papers and occasional critical reviews on all aspects of research and technology in materials engineering: physical metallurgy, materials science, and processing of metals and other materials. Emphasis is placed on those aspects of the science of materials that are concerned with the relationships among the processing, structure and properties (mechanical, chemical, electrical, electrochemical, magnetic and optical) of materials. Aspects of processing include the melting, casting, and fabrication with the thermodynamics, kinetics and modeling.
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