机械工程学报

JIN Huiming
College of Mechanical Engineering, Yangzhou University,
Yangzhou 225005, China

FELIX Adriana
College of Materials Engineering,
National University of Antiuquia,
Medellin 23715, Colombia

INFLUENCE OF RARE EARTH
DOPING ON MECHANICAL
PROPERTY AND MICRO-STRUCTURE
OF CHROMIA OXIDE FILM*

Abstract: The isothermal oxidizing kinetics of Co-40Cr alloy and its yttrium ion-implanted samples are studied at 1 000 ℃ in air by thermal-gravity analysis (TGA). Scanning electronic microscopy (SEM) is used to examine the Cr₂O₃ oxide film’s morphology after oxidation. Acoustic emission (AE) method is used in situ for monitoring the cracking and spalling of oxide films formed on both samples during oxidizing and subsequent air-cooling stages. Theoretical model is proposed relating to the film fracture process and is used for analyzing the acoustic emission spectrum both on time domain and on AE-event number domain. It is found that yttrium implantation remarkably reduces the isothermal oxidizing rate of Co-40Cr and improves the anti-cracking and anti-spalling properties of Cr₂O_{3 oxide film. The reasons for the improvement are mainly that the implanted yttrium reduced the grain size of Cr₂O}_{3 oxide, increased the high temperature plasticity of oxide film, and remarkably reduced the number and size of Cr₂O}_{3 /Co-40Cr interfacial defects.}

Key words: Stress Acoustic emission Interface Yttrium Oxidation

* This project is supported by National Natural Science Foundation of China (No. 29231011) and Natural Science Foundation of Jiangsu Province, China (No. 07KJD430246). Received May 28, 2007; received in revised form December 21, 2007; accepted March 6, 2008

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Biographical notes

JIN Huiming, born in 1968, is a professor in College of Mechanical Engineering, Yangzhou University, China. He received his PhD degree from Institute of Metal Research, Chinese Academy of Sciences, China, in 1996. His research interests include materials surface engineering and surface property modification.
Tel: +86-13665218696; E-mail: doctorjhm@sohu.com

FELIX Adriana, born in 1961, is currently a professor in College of Materials Engineering, National University of Antiuquia, Colombia. He received his PhD degree from Institute of Science and Technology, University of Manchester (UMIST), England, in 1986.
Tel: +57-4-2134841; E-mail: icorros@uis.edu.co

References

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[3] 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.
[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, 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.
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