Microstructure and oxidation behavior of the Y/Ta/Hf co-doped AlCoCrFeNi high-entropy alloys in air at 1100 °C

被引：34

作者：

Hu, Junhao ^{[1
,2
]}

Gu, Cang ^{[1
,2
]}

Li, Jianyu ^{[1
,2
]}

Li, Chao ^{[1
,2
]}

Feng, Jing ^{[1
,2
]}

Jiang, Yehua ^{[1
,2
]}

机构：

[1] Kunming Univ Sci & Technol, Fac Mat Sci & Engn, Kunming 650093, Peoples R China

[2] Kunming Univ Sci & Technol, Natl Local Joint Engn Lab Technol Adv Met Solidifi, Kunming 650093, Peoples R China

来源：

CORROSION SCIENCE | 2023年 / 212卷

基金：

中国国家自然科学基金;

关键词：

A; High-entropy alloy; B; EPMA; TEM; C; Oxidation; High temperature; HIGH-TEMPERATURE OXIDATION; THERMAL BARRIER COATINGS; CORROSION BEHAVIOR; CYCLIC OXIDATION; MCRALY COATINGS; ALPHA-AL2O3; DIFFUSION; YTTRIUM; GROWTH; PHASE;

D O I：

10.1016/j.corsci.2022.110930

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The grain morphology and oxidation behavior of the Y/Ta/Hf co-doped AlCoCrFeNi high-entropy alloy (HEA) were investigated in air at 1100 degrees C. The Y/Ta/Hf co-doped significantly improves the high-temperature oxidation resistance of the alloy. Hf doped AlCoCrFeNiYTa HEA presents the larger grain sizes of Al2O3, which effectively reduces the inward diffusion of O along the grain boundaries. In addition, Y/Ta/Hf co-doped AlCoCrFeNi HEA accelerates the transformation metastable Al2O3 to alpha-Al2O3. The oxide pegs formed at the oxide/substrate interface have a positive effect on improving the adhesion of the oxide scale, and Ta increased the probability of oxide peg formation.

引用

页数：14

共 59 条

[1] Evaluating the influence of microstructural attributes: Fraction, composition, size and spatial distribution of phases on the oxidation behaviour of high-entropy alloys [J].