Dynamic recovery and recrystallization during high-temperature tensile deformation of a free-standing Pt-aluminide bond coat

Alam, Zafir Md and Kamat, SV and Jayaram, V and Karamched, Phani S and Ghosal, P and Das, DK (2014) Dynamic recovery and recrystallization during high-temperature tensile deformation of a free-standing Pt-aluminide bond coat. In: MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 604 . pp. 18-22.

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Abstract

Free-standing Pt-aluminide (PtAl) bond coat, when subjected to tensile testing at high temperatures (T >= 900 degrees C), exhibits significant decrease in strength and increase in ductility during deformation at strains exceeding that corresponding to the ultimate tensile strength (UTS), i.e., in the post-UTS regime. The stress-strain curve is also marked by serrations in this regime. Electron back scattered diffraction (EBSD) and transmission electron microscopy (TEM) studies suggest dynamic recovery and recrystallization (DRR) as the mechanisms for the observed tensile behavior in the coating. Activation energy values suggest vacancy diffusion assists DRR. The fine recrystallized grains formed after deformation had a strong < 110 > texture. (c) 2014 Elsevier B.V. All rights reserved.

Item Type:	Journal Article
Publication:	MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Publisher:	ELSEVIER SCIENCE SA
Additional Information:	Copyright for this article belongs to the ELSEVIER SCIENCE SA, PO BOX 564, 1001 LAUSANNE, SWITZERLAND
Keywords:	Free-standing Pt-aluminide coating; Tension test; Dynamic recovery and recrystallization; Texture
Department/Centre:	Division of Chemical Sciences > Materials Research Centre
Date Deposited:	11 Jun 2014 10:36
Last Modified:	11 Jun 2014 10:36
URI:	http://eprints.iisc.ac.in/id/eprint/49212

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