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Slip Transfer across Hetero-Interfaces in two-phase Titanium Aluminum Intermetallics

Published online by Cambridge University Press:  15 March 2011

Jörg M.K. Wiezorek ,
Xiao-Dong Zhang  and
Hamish L. Fraser
Jörg M.K. Wiezorek
Affiliation:
Department of Materials Science and Engineering, University of Pittsburgh, Pittsburgh, PA
Xiao-Dong Zhang
Affiliation:
Center for Materials Science, Bose Corporation, Framingham, MA
Hamish L. Fraser
Affiliation:
Department of Materials Science & Engineering, The Ohio State University, Columbus, OH
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Abstract

The role of slip transfer processes across the heterophase interfaces in two-phase TiAl intermetallics has been studied. Polysynthetically twinned crystals of TiAl (PST-TiAl) have been used as model systems for individual grains in technologically relevant polycrystalline lamellar TiAl alloys. Compressive plastic loads have been applied for orientations of the lamellar interfaces parallel and perpendicular to the loading directions to produce hard mode slip activity. Transmission electron microscopy has been used to determine the active deformation modes in the constituent phases and to study the slip transfer across heterophase interfaces. The results are discussed with respect to the mechanical behavior of PST-TiAl and lamellar TiAl alloys, which is of relevance to in-service performance and metallurgical processing operations.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 819: Symposia N/P – Interfacial Engineering for Optimized Properties III , 2004 , N4.5/P4.5
Copyright
Copyright © Materials Research Society 2004

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