High-temperature oxidation behaviour of CoCrNi medium-entropy alloy

被引：86

作者：

Agustianingrum, Maya Putri ^{[1
]}

Lee, Unhae ^{[2
]}

Park, Nokeun ^{[1
,3
]}

机构：

[1] Yeungnam Univ, Sch Mat Sci & Engn, 280 Daehak Ro, Gyeongbuk 38541, South Korea

[2] POSCO Tech Res Labs, Gwangyang 57807, South Korea

[3] Yeungnam Univ, Inst Mat Technol, 280 Daehak Ro, Gyongsan 38541, Gyeongbuk, South Korea

来源：

CORROSION SCIENCE | 2020年 / 173卷 / 173期

基金：

新加坡国家研究基金会;

关键词：

Alloy; Oxidation; Chromium-based oxide; Diffusion; Transmission electron microscope; PHASE-STABILITY; DIFFUSION; PRECIPITATION; EVOLUTION; ELEMENTS; LAYER;

D O I：

10.1016/j.corsci.2020.108755

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The high-temperature oxidation behaviour of CoCrNi was investigated over different exposure times (6, 12, 24, and 48 h) at 900-1100 degrees C. The initial phase identification indicated that the tendency of oxide formation at 1100 degrees C was different after each exposure time. Microstructure observation demonstrated that Cr2O3 was mainly present at the interface of the oxide layer/base alloy, whereas CoCr2O4 and NiCr2O4 were identified near the outer oxide layer. The oxidation mechanism and the corresponding activation energy of CoCrNi were explained based on the slow diffusion of the Co, Cr, and Ni elements and the vacancy accumulation near the surface.

引用

页数：10

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