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

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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.

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Acknowledgments

Support for this work by a grant from the National Science Foundation with Dr. Bruce MacDonald as program manager and from the Office of Research, University of Pittsburgh are gratefully acknowledged. The authors also thank Dr. Dennis Dimiduk, Materials Directorate, Wright Laboratories, Wright-Patterson Air Force Base, for provision of the PST-TiAl rods.

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Authors and Affiliations

  1. Department of Materials Science and Engineering, University of Pittsburgh, Pittsburgh, PA, USA

    Jörg M.K. Wiezorek

  2. Center for Materials Science, Bose Corporation, Framingham, MA, USA

    Xiao-Dong Zhang

  3. Department of Materials Science & Engineering, The Ohio State University, Columbus, OH, USA

    Hamish. L. Fraser

Authors
  1. Jörg M.K. Wiezorek
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  2. Xiao-Dong Zhang
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  3. Hamish. L. Fraser
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Wiezorek, J.M., Zhang, XD. & Fraser, H.L. Slip Transfer across Hetero-Interfaces in two-phase Titanium Aluminum Intermetallics. MRS Online Proceedings Library 819, 45 (2004). https://doi.org/10.1557/PROC-819-N4.5/P4.5

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  • DOI: https://doi.org/10.1557/PROC-819-N4.5/P4.5

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