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Effect of Strain Rate on Ductile-to-Brittle Transition Temperature of a Free-Standing Pt-Aluminide Bond Coat

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Abstract

The ductile-to-brittle transition temperature (DBTT) of a free-standing Pt-aluminide (PtAl) bondcoat was determined using the microtensile testing method and the effect of strain rate variation, in the range 10−5 to 10−1 s−1, on the DBTT studied. The DBTT increased appreciably with the increase in strain rate. The activation energy determined for brittle-to-ductile transition, suggested that such transition is most likely associated with vacancy diffusion. Climb of 〈100〉 dislocations observed in analysis of dislocation structure using a transmission electron microscope (TEM) supported the preceding mechanism.

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The authors thank the MEG, SFAG, and EMG divisions of DMRL and Miss Jaya, IISc Bangalore, for the experimental assistance. They are thankful to Professor Dipankar Banerjee, IISc Bangalore, for his valuable technical input. They thank the director of DMRL for his permission to publish this research work. This research work was funded by DRDO.

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Authors and Affiliations

  1. Defence Metallurgical Research Laboratory, Hyderabad, 500 058, India

    Md. Zafir Alam (Scientist), D. Chatterjee (Scientist), K. Muraleedharan (Scientist), T. K. Nandy (Scientist), S. V. Kamat (Scientist) & D. K. Das (Scientist)

  2. Indian Institute of Science, Bangalore, 560 012, India

    V. Jayaram (Professor)

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  1. Md. Zafir Alam
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  2. D. Chatterjee
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  3. K. Muraleedharan
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  4. T. K. Nandy
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  5. S. V. Kamat
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  6. V. Jayaram
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  7. D. K. Das
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Correspondence to Md. Zafir Alam.

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Manuscript submitted October 14, 2010.

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Alam, M.Z., Chatterjee, D., Muraleedharan, K. et al. Effect of Strain Rate on Ductile-to-Brittle Transition Temperature of a Free-Standing Pt-Aluminide Bond Coat. Metall Mater Trans A 42, 1431–1434 (2011). https://doi.org/10.1007/s11661-011-0683-2

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