Thermal oxidation characteristics of Fex(CoCrMnNi)100-x medium and high-entropy alloys

被引：46
作者：
Agustianingrum, Maya Putri [1 ]
Latief, Fahamsyah Hamdan [2 ]
Park, Nokeun [1 ,3 ]
Lee, Unhae [4 ]
机构：
[1] Yeungnam Univ, Sch Mat Sci & Engn, 280 Daehak Ro, Gyeongbuk 38541, South Korea
[2] IMSIU, Coll Engn, Dept Mech Engn, Riyadh 11432, Saudi Arabia
[3] Yeungnam Univ, Inst Mat Technol, 280 Daehak Ro, Gyongsan 38541, Gyeongbuk, South Korea
[4] POSCO Tech Res Labs, Gwangyang 57807, South Korea
来源：
INTERMETALLICS | 2020年 / 120卷
基金：
新加坡国家研究基金会;
关键词：
High-entropy alloys; Diffusion; Oxidation; Microstructure; Scanning electron microscopy; Activation energy; HIGH-TEMPERATURE OXIDATION; SINGLE-CRYSTAL SUPERALLOY; MECHANICAL-PROPERTIES; VACANCY CONCENTRATION; SLUGGISH DIFFUSION; PHASE-STABILITY; BEHAVIOR; CR; MICROSTRUCTURE; SYSTEM;
D O I：
10.1016/j.intermet.2020.106757
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
The thermal oxidation behavior of Fe-x(CoCrMnNi)(100-x) high-entropy alloys (x = 20 and 40 at.%) and medium-entropy alloy (x = 60 at.%) at temperatures ranging from 900 degrees C to 1100 degrees C under air atmosphere was investigated. The oxidation kinetics of the alloys followed the parabolic law, indicated by the increase of oxidation rate constants with increasing Fe content and temperature. The addition of Fe content lowered the configurational entropy and activation energy of the alloys, supporting the acceleration of metal atoms diffusion. Furthermore, the oxide scales formed on the surface were strongly dependent on the alloy composition. In general, a Cr2O3 inner layer, spinels (NiCr2O4 and CoMn2O4) as intermediate layers, and the outer layers of Fe3O4 and Mn3O4 were formed after oxidation at 900 degrees C in all alloys. On the other hand, severe internal oxidation and pores were observed in the alloy containing 60 at.% of Fe after oxidation at 1100 degrees C. In addition, the pores were formed due to the Kirkendall effect, acting as diffusion path and reaction place which may facilitate the oxidation process.
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页数：11
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