等摩尔Cr-Mn-Fe-Co高熵合金的高温氧化行为

High Temperature Oxidation Behavior of an Equimolar Cr-Mn-Fe-Co High-Entropy Alloy.

作者信息

Wang Lin, Zeng Quanqing, Xie Zhibao, Zhang Yun, Gao Haitao

机构信息

College of Mechanical and Electrical Engineering, Central South University, Changsha 410083, China.

State Key Laboratory of High Performance Complex Manufacturing, Central South University, Changsha 410083, China.

出版信息

Materials (Basel). 2021 Jul 30;14(15):4259. doi: 10.3390/ma14154259.

DOI:10.3390/ma14154259

PMID:34361455

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC8346963/

Abstract

The oxidation behavior of an equimolar Cr-Mn-Fe-Co high-entropy alloy (HEA) processed by 3D laser printing was investigated at 700 °C and 900 °C. The oxidation kinetics of the alloy followed the parabolic rate law, and the oxidation rate constant increased with the rising of the temperature. Inward diffusion of oxygen and outward diffusion of cations took place during the high-temperature oxidation process. A spinel-type oxide was formed on the surface, and the thickness of the oxide layer increased with the rising of experimental temperature or time. The exfoliation of the oxide layer took place when the test was operated at 900 °C over 12 h. During oxidation tests, the matrix was propped open by oxides and was segmented into small pieces. The formation of loose structures had great effects on the high-temperature oxidation resistance of the HEA.

摘要

研究了通过3D激光打印制备的等摩尔Cr-Mn-Fe-Co高熵合金（HEA）在700℃和900℃下的氧化行为。该合金的氧化动力学遵循抛物线速率定律，且氧化速率常数随温度升高而增加。在高温氧化过程中发生了氧的向内扩散和阳离子的向外扩散。表面形成了尖晶石型氧化物，且氧化层厚度随实验温度或时间的升高而增加。当试验在900℃下进行超过12小时时，氧化层发生剥落。在氧化试验期间，基体被氧化物撑开并被分割成小块。疏松结构的形成对高熵合金的高温抗氧化性有很大影响。