Isothermal oxidation behavior of micro-regions in multiphase Ni3Al-based superalloys

Isothermal oxidation behavior of micro-regions in multiphase Ni3Al-based superalloys
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多相Ni3Al基高温合金微区等温氧化行为

DOI:
10.1016/j.matchar.2020.110748
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发表时间:
2020-11
影响因子:
4.7
通讯作者:
Liu Yongchang
Liu Yongchang
中科院分区:
材料科学1区
文献类型:
--
作者:
Guo Jingyuan;Li Yefan;Li Chong;Yu Liming;Li Huijun;Wang Zumin;Liu Yongchang

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研究了多相Ni3Al基高温合金(高Fe和Cr含量)微区在600 °C空气中的等温氧化行为。氧化膜主要由外层NiO、NiFe2O4和Al2O3的混合氧化层和内层Al2O3单层组成。特别是在γ' + γ枝晶的外层氧化膜中生成了Cr_2O_3,Cr元素富集。在枝晶间区域(高Al含量的β相)形成了相对致密的连续Al2O3层。此外,γ'包层(连接γ' + γ枝晶和枝晶间β相)表现出明显的胞状突起(NiO和NiFe2O4混合氧化物)的优先氧化。
The isothermal oxidation behavior of micro-regions in multiphase Ni3Al-based superalloys (high Fe and Cr contents) was investigated at 600 °C in air. The oxide scale is mainly composed of the outer mixed oxide layer (NiO, NiFe2O4and Al2O3) and the inner single Al2O3layer. In particular, Cr2O3is formed in the outer oxide scale of γ' + γ dendrite with enrichment in Cr element. The relative dense continuous Al2O3layer is formed in the interdendritic region (β phase with high Al content). In addition, γ' envelope (connecting the γ' + γ dendrite and interdendritic β phase) shows preferential oxidation featuring significant cellular bulge (NiO and NiFe2O4mixed oxides).
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