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Observation of <2c+a> Dislocation Glide in Duplex Ti-48at.% Al after Room Temperature Tensile Deformation

Published online by Cambridge University Press:  21 September 2018

Jörg M. K. Wiezorek  and
Andreas K. Kulovits
Jörg M. K. Wiezorek
Affiliation:
Department of Mechanical Engineering and Materials Science, Swanson School of Engineering, University of Pittsburgh, 848 Benedum Hall, 3700 O’Hara Street, Pittsburgh, PA 15261, USA
Andreas K. Kulovits
Affiliation:
Department of Mechanical Engineering and Materials Science, Swanson School of Engineering, University of Pittsburgh, 848 Benedum Hall, 3700 O’Hara Street, Pittsburgh, PA 15261, USA
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Abstract

In this study we investigated the deformation behavior of the hexagonal ordered phase α2- Ti3Al in Duplex TiAl under tensile loading. Transmission electron microscopy (TEM) revealed that the orientation relation ships (OR) between α2-Ti3Al and the L10 ordered γ- TiAl phase are very different as compared to the OR common in fully lamellar PST TiAl. We observed deformation related <2c+a> dislocation activity on pyramidal slip systems in the α2-phase during post situ TEM analyses. We rationalize this observation by the possible build up of pile up stresses in γ-TiAl due to the different OR with the α2-Ti3Al phase that can possibly lead to the activation of <2c+a> dislocation activity on pyramidal slip systems with similarly resolved stresses in the α2-Ti3Al phase.

Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1128: Symposium U – Advanced Intermetallic-Based Alloys for Extreme Environment and Energy Applications , 2008 , 1128-U04-04
Copyright
Copyright © Materials Research Society 2009

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