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Lamellar Interfaces and Their Contribution to Plastic Flow Anisotropy in TiAl-Based Alloys

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Abstract

Lamellar γ/α2 TiAl deforms much more easily in the plane of the lamellae (soft mode) than across the lamellae (hard mode). This plastic anisotropy is caused by the soft mode being softer and the hard mode being harder than in monolithic TiAl. The suggested explanations are that the y phase is softened by interstitial gettering, that an extra soft mode exists because superdislocations can channel along interfaces and that the hard mode is dominated by the Hall-Petch effect.

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Acknowledgements

PMH acknowledges support from USAF contract no. F33615-91-C-5663. BKK acknowledges stimulating exchanges with Dr. Robert Asaro, Dr. Richard Beanland and Dr. Pavan Nagpal.

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Authors and Affiliations

  1. University of California-San Diego, AMES-0411, LaJolla, CA, 92093

    Bimal K. Kad

  2. UES Inc., 4401 Dayton-Xenia Road, Dayton, OH, 45432

    Peter M. Hazzledine

  3. Ohio State University, 2041 College Road, Columbus, OH, 43210

    Hamish L. Fraser

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  1. Bimal K. Kad
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  2. Peter M. Hazzledine
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  3. Hamish L. Fraser
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Kad, B.K., Hazzledine, P.M. & Fraser, H.L. Lamellar Interfaces and Their Contribution to Plastic Flow Anisotropy in TiAl-Based Alloys. MRS Online Proceedings Library 288, 495–500 (1992). https://doi.org/10.1557/PROC-288-495

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  • DOI: https://doi.org/10.1557/PROC-288-495

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