利用扫描电镜、维氏硬度计、X射线衍射和能谱分析研究了CoNiCrAlY合金及添加3％、5％Pt(质量分数)改进的CoNiCrAlY合金组织、硬度及恒温氧化行为.结果表明:Pt在合金中形成了一种-(Ni,Pt)Al相,显著改变了合金的组织；Pt的添加使得合金的硬度有了略微的提高；Pt促进了亚稳态的θ-Al2O3向稳态a-Al2O3的相转变,降低合金的氧化速率,Pt还抑制了β-相的消耗及内氧化的产生,提高了合金的抗氧化性能.
The microstructure,hardness and isothermal oxidation behavior of CoNiCrAlY alloy modified by addition of 3 wt％ and 5 wt％ Pt were investigated using scanning electron microscopy,Vickers hardness tester,X-ray diffraction and energy dispersive spectroscopy analysis.The results reveal that Pt has a significant influence on the microstructure of the experimental alloy by formation of β-(Ni,Pt)Al phase.Addition of Pt can slightly increase the hardness of the experimental alloys.Pt will accelerate the phase transformation of alumina from metastable θ-Al2O3 to stable α-Al2O3,which is the main reason for the lowering oxidation rate and the formation of a protective oxide scale on the Pt-containing alloys.Furthermore,adding of Pt can improve the Al transport,which suppresses the consumption of β-phase and eliminates the internal oxidation.
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