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TEM of C-component Dislocations Associated with Pyramidal Slip Activity in Hexagonal α2-Ti3Al

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, 37000 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, 37000 O’Hara Street, Pittsburgh, PA 15261, USA
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Abstract

While only a minor phase constituent, the deformation behavior of the hexagonal α2-Ti3Al phase, significantly affects the mechanical properties of two-phase TiAl based alloys. We have used conventional and high-resolution transmission electron microscopy to investigate the fine structure of pyramidal plane glide dislocations, with Burgers vectors of the type b=<2c+a>, in α2-Ti3Al after room temperature compression of binary polysynthetically twinned TiAl normal to the lamellar interfaces to nominal plastic strains of 1%-7%. We report atomic resolution observations of non-co-planar dislocation core configurations for <2c+a>-dislocations and show that translamellar deformation twins active in the majority γ-TiAl phase play an important role in facilitating pyramidal plane slip in α2-Ti3Al in the lamellar two-phase alloys.

Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1128: Symposium U – Advanced Intermetallic-Based Alloys for Extreme Environment and Energy Applications , 2008 , 1128-U04-05
Copyright
Copyright © Materials Research Society 2009

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