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Journal of Materials Science

, Volume 41, Issue 14, pp 4654–4662 | Cite as

Formation of titanium nitride on γ-TiAl alloys by direct metal–gas reaction

  • Kittichai Sopunna
  • Titipun Thongtem
  • Michael McNallan
  • Somchai ThongtemEmail author
Article

Abstract

Two alloys, Ti-47Al-2Nb-2Cr (MJ12) and Ti-47Al-2Nb-2Mn + 0.8TiB2 (MJ47), were nitrided in purified ammonia for 3.6 × 103–3.6 × 104 s (1–10 h) at a temperature range of 800–1,000 °C. The nitridation process can successfully improve alloy hardness which increased with an increase of the nitridation temperature and time. Hardness values of MJ12 and MJ47 with 1,000 °C nitridation for 3.6 × 104 s were the highest at 700.5 ± 9.0 and 694.7 ± 21.8 kg mm−2, respectively. The wear rate and friction coefficient were significantly reduced by the nitridation process. Wear resistance of both alloys increased by two orders of magnitude after nitridation compared to the corresponding alloys without nitridation. In addition, the alloys were analyzed using XRD, SEM, EDX and an optical microscope.

Keywords

Friction Coefficient Wear Resistance Wear Rate Tribological Property Wear Track 

Notes

Acknowledgements

The research was supported by the Thailand Research Fund, Bangkok, Thailand. We are grateful to Howmet Corp. for providing the alloys and to Professor Dr. T. Vilaithong, FNRF, Department of Physics, Faculty of Science, Chiang Mai University, for permission to use the microhardness and wear testers.

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Copyright information

© Springer Science+Business Media, LLC 2006

Authors and Affiliations

  • Kittichai Sopunna
    • 1
  • Titipun Thongtem
    • 1
  • Michael McNallan
    • 2
  • Somchai Thongtem
    • 1
    Email author
  1. 1.Faculty of ScienceChiang Mai UniversityChiang Mai Thailand
  2. 2.CME Department (M/C: 246), College of EngineeringUniversity of Illinois at ChicagoChicagoUSA

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