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Isothermal oxidation behavior and mechanism of a nickel-based superalloy at 1000°C 被引量:3
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作者 Zhi-yuan Zhu Yuan-fei Cai +3 位作者 you-jun gong Guo-ping Shen Yu-guo Tu Guo-fu Zhang 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2017年第7期776-783,共8页
The oxidation behavior of a nickel-based superalloy at 1000°C in air was investigated through X-ray diffraction, scanning electron microscopy, and energy-dispersive spectroscopy analysis. A series of oxides, incl... The oxidation behavior of a nickel-based superalloy at 1000°C in air was investigated through X-ray diffraction, scanning electron microscopy, and energy-dispersive spectroscopy analysis. A series of oxides, including external oxide scales(Cr_2O_3,(TiO_2 + Mn Cr_2O_4)) and internal oxides(Al_2O_3,Ti N), were formed on the surface or sub-surface of the substrate at 1000°C in experimental still air. The oxidation resistance of the alloy was dependent on the stability of the surface oxide layer. The continuity and density of the protective Cr_2O_3 scale were affected by minor alloying elements such as Ti and Mn. The outermost oxide scale was composed of TiO_2 rutile and Mn Cr_2O_4 spinel, and the growth of TiO_2 particles was controlled by the outer diffusion of Ti ions through the pre-existing oxide layer. Severe internal oxidation occurred beneath the external oxide scale, consuming Al and Ti of the strength phase γ′(Ni_3(Al,Ti)) and thereby severely deteriorating the surface mechanical properties. The depth of the internal oxidation region was approximately 35 μm after exposure to experimental air at 1000°C for 80 h. 展开更多
关键词 nickel-based superalloy isothermal oxidation oxide scale internal oxidation
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