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Pt effect on early stage oxidation behaviour of Pt-diffused γ-Ni/γ’-Ni3Al coatings
Acta Materialia ( IF 9.4 ) Pub Date : 2020-05-01 , DOI: 10.1016/j.actamat.2020.03.013
Chen Liu , Ying Chen , Alexander S. Eggeman , G. Brewster , Ping Xiao

Abstract The early stage oxidation behaviours of γ/γ’-based NiAl coatings with different Pt additions are investigated. It is found that Pt addition can slow down the θ-Al2O3 to α-Al2O3 transformation. High resolution phase mapping by scanning diffraction analysis shows that α-Al2O3 nucleation in the θ-Al2O3 scale is inhomogeneous along the coating/scale interface. Spatially resolved PLPS results show a clear correlation between the θ-Al2O3 to α-Al2O3 transition and the γ or γ’ microstructure in the underlying alloy: where Pt stabilises the γ’ structure, the suppression of θ-Al2O3 to α-Al2O3 transition is observed. The slower θ-Al2O3 to α-Al2O3 transition rate due to Pt addition leads to a lower compressive stress of the stable oxide scale, which contributes to the long term stability of the scale as a result of Pt addition.

中文翻译:

Pt对Pt扩散γ-Ni/γ'-Ni3Al涂层早期氧化行为的影响

摘要 研究了不同Pt添加量的γ/γ'基NiAl涂层的早期氧化行为。发现 Pt 的添加可以减缓 θ-Al2O3 到 α-Al2O3 的转变。通过扫描衍射分析的高分辨率相位映射表明 θ-Al2O3 尺度中的 α-Al2O3 成核沿涂层/尺度界面是不均匀的。空间分辨 PLPS 结果显示 θ-Al2O3 到 α-Al2O3 的转变与底层合金中的 γ 或 γ' 显微组织之间存在明显的相关性:在 Pt 稳定 γ' 结构的情况下,θ-Al2O3 到 α-Al2O3 转变的抑制是观察到的。由于 Pt 的加入,θ-Al2O3 到 α-Al2O3 的转变速率较慢,导致稳定氧化皮的压应力较低,这有助于氧化皮的长期稳定性。
更新日期:2020-05-01
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