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Microstructure-dependent oxidation behavior of Ni-Al single-crystal alloys

Journal Article


Abstract


  • The effect of the �����+�� two-phase structure on the oxidation behaviors of Ni-Al single-crystal alloys at 650 ��C was investigated by scanning electron microscopy, transmission electron microscopy, atomic force microscopy, X-ray diffraction and Auger electron spectroscopy. In the initial oxidation stage, the oxidation behavior is primarily determined by the growth pattern of oxides in the �� channel. The outward convex NiO was formed in unprotected wide �� channels. And Ni-Al spinel oxide provides a great number of short-circuit paths, accelerating the inward diffusion of oxygen and outward diffusion of Ni. In the late stage of oxidation, the elongated internal oxide in the large ����� phase contributes to the diffusion of oxygen along the oxide/metal interface. Consequently, the Ni-Al single-crystal alloy with wide �� channels and large ����� precipitates exhibited poor oxidation performance.

Publication Date


  • 2020

Citation


  • Pei, J., Li, Y., Li, C., Wang, Z., Liu, Y., & Li, H. (2020). Microstructure-dependent oxidation behavior of Ni-Al single-crystal alloys. Journal of Materials Science and Technology, 52, 162-171. doi:10.1016/j.jmst.2020.04.006

Scopus Eid


  • 2-s2.0-85084173719

Start Page


  • 162

End Page


  • 171

Volume


  • 52

Issue


Place Of Publication


Abstract


  • The effect of the �����+�� two-phase structure on the oxidation behaviors of Ni-Al single-crystal alloys at 650 ��C was investigated by scanning electron microscopy, transmission electron microscopy, atomic force microscopy, X-ray diffraction and Auger electron spectroscopy. In the initial oxidation stage, the oxidation behavior is primarily determined by the growth pattern of oxides in the �� channel. The outward convex NiO was formed in unprotected wide �� channels. And Ni-Al spinel oxide provides a great number of short-circuit paths, accelerating the inward diffusion of oxygen and outward diffusion of Ni. In the late stage of oxidation, the elongated internal oxide in the large ����� phase contributes to the diffusion of oxygen along the oxide/metal interface. Consequently, the Ni-Al single-crystal alloy with wide �� channels and large ����� precipitates exhibited poor oxidation performance.

Publication Date


  • 2020

Citation


  • Pei, J., Li, Y., Li, C., Wang, Z., Liu, Y., & Li, H. (2020). Microstructure-dependent oxidation behavior of Ni-Al single-crystal alloys. Journal of Materials Science and Technology, 52, 162-171. doi:10.1016/j.jmst.2020.04.006

Scopus Eid


  • 2-s2.0-85084173719

Start Page


  • 162

End Page


  • 171

Volume


  • 52

Issue


Place Of Publication