Effect of Prior Oxidation on Tensile Properties of Bare and Al3Ti Diffusion Aluminide Coated Near α Titanium Alloy Titan 29A

  • Chandrakant Parlikar
  • Md Zafir Alam
  • Dipak K. Das
Technical Paper
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Abstract

The effect of prior oxidation, for various durations up to 2,000 h in air at 650 °C, on the room temperature tensile properties of uncoated and Al3Ti diffusion aluminide coated near α Ti alloy, Titan 29A, has been evaluated. The tensile properties of the uncoated alloy deteriorated with oxidation. Oxidation for just 100 h caused 11–13 % decrease in yield strength (YS) and ultimate tensile strength (UTS) of the alloy. The uncoated alloy exhibited brittle fracture within the elastic regime at significantly lower stress after oxidation for 2,000 h. On the other hand, the strength of the coated alloy remained unaffected even after 2,000 h of oxidation and the YS and UTS was similar to that of the un-oxidized alloy. The ductility of the coated alloy, however, decreased with the increase in oxidation duration. Such differences in the tensile behavior of the uncoated and coated alloy can be ascribed to the beneficial effect of the Al3Ti diffusion aluminide coating in preventing surface embrittlement in the alloy during oxidation.

Keywords

Near α Ti alloy Al3Ti coating Oxidation Tensile properties 
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Notes

Acknowledgments

The authors acknowledge the assistance provided by MBG, SFAG and EMG groups of DMRL. They are thankful to Director, DMRL, for his encouragement. This research work has been funded by the Defence Research and Development Organization, DRDO.

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Copyright information

© Indian Institute of Metals 2013

Authors and Affiliations

  • Chandrakant Parlikar
    • 1
  • Md Zafir Alam
    • 1
  • Dipak K. Das
    • 1
  1. 1.Defence Metallurgical Research LaboratoryHyderabadIndia

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