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Slip Transfer Across Hetero-Interfaces in Two-Phase Titanium Aluminum Intermetallics |
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| Authors: | Jörg MK Wiezorek Andreas Kulovits Xiao-Dong Zhang Hamish L Fraser |
| Affiliation: | (1) Department of Mechanical Engineering and Materials Science, Swanson School of Engineering, University of Pittsburgh, Pittsburgh, PA 15260, USA;(2) Center for Materials Science, Bose Corporation, Framingham, MA 01701, USA;(3) Department of Materials Science & Engineering, The Ohio State University, Columbus, OH 43210, USA; |
| Abstract: | The role of slip transfer processes across the heterophase interfaces in two-phase TiAl intermetallics has been studied. Polysynthetically twinned (PST) 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 in both the γ and the α 2 phases. Transmission electron microscopy has been used to determine the active deformation modes in the constituent phases and to study details of the hard mode of the slip transfer across heterophase interfaces. The results are discussed with respect to the mechanical behavior of PST-TiAl. |
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