High-Temperature Oxidation Behaviors and γ' Phase Stability of a New Fourth-Generation Single Crystal Superalloy with Rare Earth
Received date: 2024-07-19
Revised date: 2024-12-04
Online published: 2025-02-25
Supported by
National Natural Science Foundation of China(51601091);Jiangsu Province Leading Edge Technology Basic Research Major Project(BK20222014);Key Research and Development Plan of Jiangsu Province(BE2020085)
To improve the oxidation resistance, which is compromised by high concentrations of W and Mo in control alloys, developing a new fourth-generation Ni-based single crystal superalloy is essential. In this study, we investigated the oxidation behavior and γ' phase degradation of a new fourth-generation single crystal superalloy containing rare earth (RE) elements at 1100 oC. After an initial 3 h of oxidation, a NiO layer and a discontinuous, needle-like Al2O3 layer rapidly formed on the sample surface, accompanied by the formation of a RE oxide film beneath the NiO layer. The RE oxide film effectively inhibited the internal diffusion of O element and its reaction with refractory metal elements, preventing the formation of spinel oxides and reducing the thickening rate of the spinel oxide layer. As a result, the discontinuous needle-like Al2O3 layer transforms into a partially continuous Al2O3 layer during the second stage (3-25 h) and delayed oxidation-induced mass loss in the third stage (25-60 h). After 100 h of oxidation, continuous Al2O3 and NiAl2O4 spinel layers were formed on the alloy surface, effectively hindering both the outward diffusion of alloy elements and the inward diffusion of O element. Moreover, the γ'-free layer exhibited a notable increase in thickness with the oxidation time. No topologically close-packed phase was detected in the γ'-free layer or in the interior of the sample, indicating the superior high-temperature stability of the alloy.
GUO Shijia , LI Jianyue , YUAN Shengyun , LI Zhigang , YU Lianxu , ZHANG Yong . High-Temperature Oxidation Behaviors and γ' Phase Stability of a New Fourth-Generation Single Crystal Superalloy with Rare Earth[J]. Acta Metall Sin, 2026 , 62(2) : 351 -362 . DOI: 10.11900/0412.1961.2024.00243
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