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

Alam, Zafir Md and Chatterjee, Debarati and Muraleedharan, K and Nandy, TK and Kamat, SV and Jayaram, V and Das, DK (2011) Effect of Strain Rate on Ductile-to-Brittle Transition Temperature of a Free-Standing Pt-Aluminide Bond Coat. In: Metallurgical and Materials Transactions A, 42 (6). pp. 1431-1434.

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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 aOE (c) 100 > dislocations observed in analysis of dislocation structure using a transmission electron microscope (TEM) supported the preceding mechanism.

Item Type:	Journal Article
Additional Information:	Copyright of this article belongs to Springer.
Department/Centre:	Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited:	01 Jun 2011 11:40
Last Modified:	19 Jul 2011 12:08
URI:	http://eprints.iisc.ernet.in/id/eprint/37801

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