High temperature oxidation behaviour of polycrystalline and single crystal Ta stabilized γ'-strengthened Co-Ni-Al-Ta-Cr alloys
High temperature oxidation behaviour of polycrystalline and single crystal Ta stabilized γ'-strengthened Co-Ni-Al-Ta-Cr alloys
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DOI：
10.1016/j.corsci.2023.111554
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发表时间：
2023-09
影响因子：
8.3
通讯作者：
Wenguo Xu;Ying-ju Li;S. Qu;Bingyu Lu;Cuiping Wang;Yuansheng Yang
中科院分区：
文献类型：
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作者：
Wenguo Xu;Ying-ju Li;S. Qu;Bingyu Lu;Cuiping Wang;Yuansheng Yang
对Co-Ni-Al-Ta-Cr系多晶和单晶γ ′强化合金在800-1000 ℃进行了等温氧化。两种合金在800 ℃、900 ℃和1000 ℃的氧化动力学分别符合对数、三次方和抛物线规律。该多晶合金在800-1000 ℃具有上级抗氧化性能，这可以用晶界效应来解释。在800-900 ℃时，晶界扩散促进了尖晶石氧化物保护层的形成.晶界对氧化物抗溅射性能的有利影响使多晶合金在1000 ℃时仍保持较好的抗氧化性能。
Isothermal oxidation was carried out on the polycrystalline and single crystal γ'-strengthened Co-Ni-Al-Ta-Cr alloys at 800–1000 ℃. The oxidation kinetic of both alloys follows logarithmic, cubic and parabolic law at 800 ℃, 900 ℃ and 1000 ℃, respectively. The polycrystalline alloy exhibits superior oxidation resistance at 800–1000 ℃, which can be explained by the effects of grain boundary. Grain boundary diffusion enhances the formation of the protective spinel oxides layer at 800–900 ℃. The beneficial effect of the grain boundary on the spallation resistance of oxides results that the polycrystalline alloy maintains better oxidation properties at 1000 ℃.