[1] Jin Huiming, Zhang Jianfeng, Adriana C.Felix, Majorri H.Aroyave, et al. Oxide/substrate interfacial defects in high temperature oxidationof Co-40Cr by acoustic emission method [J]. Journal of Southeast University (English Edition), 2006, 22 (1): 125-129. [doi:10.3969/j.issn.1003-7985.2006.01.027]

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Oxide/substrate interfacial defects in high temperature oxidationof Co-40Cr by acoustic emission method()

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Journal of Southeast University (English Edition)[ISSN:1003-7985/CN:32-1325/N]

Volumn:

22

Issue:

2006 1

Page:

125-129

Research Field:

Materials Sciences and Engineering

Publishing date:

2006-03-20

Info

Title:

Oxide/substrate interfacial defects in high temperature oxidationof Co-40Cr by acoustic emission method

Author(s):

Jin Huiming¹;  Zhang Jianfeng¹;  Adriana C.Felix²;  Majorri H.Aroyave²

¹College of Mechanical Engineering, Yangzhou University, Yangzhou 225009, China
² College of Materials Engineering, National University of Antiuquia, Medellin 23715, Colombia

Keywords:

oxidation;  acoustic emission;  element binding energy;  interface;  yttrium

PACS:

TG174.453

DOI:

10.3969/j.issn.1003-7985.2006.01.027

Abstract:

The isothermal oxidation kinetics of a Co-40Cr alloy and its yttrium ion-implanted samples were studied at 1 000 ℃ in air by thermal-gravity analysis(TGA).Scanning electronic microscopy(SEM)was used to examine the Cr₂O₃ oxide film’s morphology after oxidation.An acoustic emission(AE)method was used in situ to monitor the cracking and spalling of oxide films formed on samples during oxidation and subsequent air-cooling stages.A theoretical model was proposed relating to the film fracture process and was used to analyze the acoustic emission spectrum on time domain and the AE-event number domain.It was found that yttrium implantation remarkably reduced the isothermal oxidation rate of Co-40Cr and improved the anti-cracking and anti-spalling properties of Cr₂O₃ oxide film.The reasons for the improvement were mainly that the implanted yttrium reduced the grain size of Cr₂O₃ oxide, increased the high temperature plasticity of oxide film, and remarkably reduced the number and size of Cr₂O₃/Co-40Cr interfacial defects.

References:

[1] Evans A G, Cannon R.Stress and decohesion of oxide scales [J].Materials Science Forum, 1989, 43(3):243-249.
[2] Rahmel A, Schutze M.Mechanical aspects of rare earth effects [J].Oxidation of Metals, 1992, 38(2):314-319.
[3] Jin Huiming, Li Tiefan, Li Meishuan, et al.Influence of yttrium implantation on oxidation behavior of Co-40Cr alloy [J].Journal of Rare Earths, 1999, 17(1):34-38.
[4] Jin Huiming, Chen Rongfa, Zhang Linnan, et al.High temperature oxidation behavior of magnetically sputtered Ni-0.5Y micro-crystal coating [J].Journal of Southeast University: English Edition, 2003, 19(4):364-367.
[5] Zhang Yifan, Shores D, Rahmel A, et al.Spallation of oxide scales formed on Ni-30Cr alloy [J].Oxidation of Metals, 1993, 40(1):529-536.
[6] Jin Huiming, Zhang Linnan, Li Meishuan, et al.Rare earth effects on adhesion of Cr₂O₃ oxide scale formed on surface of Co-40Cr alloy [J].Journal of Rare Earths, 2001, 19(1):34-39.
[7] Przybilla W, Schutze M.Role of growth stresses on the structure of oxide scales on nickel at 800 and 900 ℃ [J].Oxidation of Metals, 2002, 58(1):103-145.
[8] Ul-Hamid A.Study of the effect of Y on the scale microstructures of Cr₂O₃- and Al₂O₃-forming alloys [J].Oxidation of Metals, 2002, 58(1):23-45.

Memo

Memo:

Biography: Jin Huiming(1968—), male, doctor, professor, doctorjhm@sohu.com.

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