Hostname: page-component-76fb5796d-vfjqv Total loading time: 0 Render date: 2024-04-26T15:55:02.415Z Has data issue: false hasContentIssue false
  • English
  • Français

Microstructure, Mechanical Properties, and High-Temperature Oxidation Resistance of Boronized γ - TiAl(Mn)

Published online by Cambridge University Press:  15 February 2011

S. Kim ,
Y. Yoon ,
H. Kim  and
K. Park
S. Kim
Affiliation:
Department of Metallurgical Engineering, Inha University, Inchon 402–751, Korea
Y. Yoon
Affiliation:
Department of Metallurgical Engineering, Inha University, Inchon 402–751, Korea
H. Kim
Affiliation:
Department of Metallurgical Engineering, Inha Technical College, Inchon 402–752, Korea
K. Park
Affiliation:
Department of Materials Engineering, Chung-ju National University, Chungju, Chungbuk 380–702, Korea
Get access

Abstract

To improve the wear and high-temperature oxidation resistances of reactively sintered γ -TiAl(Mn) intermetallic compounds, they were boronized in the temperature range of 900 to 1100 °C for 5 to 11 hours with powder mixtures of B4C and Na2B4O7. It was found that the coating layer consisted of three sublayers, i.e., outer, middle, and inner sublayers. The outer, middle, and inner sublayers were identified as a mixture of TiB2 and TiO2, a mixture of Al2O3 and TiO2, and Ti-rich TiAl based compounds, respectively. The coating layer significantly improved the surface hardness and the wear and high-temperature oxidation resistances. The highest surface hardness (Hv ≈ 2720) was obtained at 900 °C for 11 hours. This surface hardness is much higher than that of TiAl(Mn) (Hv ≈ 400). In addition, the specimens boronized at both 1000 and 1050 °C for 9 hours showed an excellent high-temperature oxidation resistance. It is believed that the boronizing on the TiAl(Mn) intermetallics is very effective to improve the wear and high-temperature oxidation resistances.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 460: Symposium Z – High-Temperature Ordered Intermetallic Alloys VII , 1996 , 159
Copyright
Copyright © Materials Research Society 1997

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

1. Kim, Y.-W., J. Metals. 41, 24 (1989).Google Scholar
2. Kim, Y.-W. and Dimiduk, D. M. J. Metals. 43, 40 (1991).Google Scholar
3. Kim, Y.-W., J. Metals. 46, 30 (1994).Google Scholar
4. Taniguchi, S., Shibata, T., and Sakon, S., Mater. Sci. Eng. A 198, 85 (1995).Google Scholar
5. Taniguchi, S., Juso, H., and Shibata, T., Mater. Trans. JIM 37, 245 (1996).Google Scholar
6. Maki, K., Shioda, M., and Sayashi, M., Mater. Sci. Eng. A 153, 591 (1992).Google Scholar
7. Shida, Y. and Anada, H., Corros. Sci. 35, 945 (1993).Google Scholar