Martensite in a TiAl alloy quenched from beta phase field |
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| Affiliation: | 1. Center for the Accelerated Maturation of Materials, Department of Materials Science and Engineering, The Ohio State University, 1305 Kinnear Road, Columbus, OH 43212, USA;2. General Electric Company, Global Research Center, Niskayuna, NY 12309, USA;3. Center for Advanced Research and Technology, Department of Materials Science and Engineering, University of North Texas, 3940 N. Elm, Denton, TX 76207, USA;4. Department of Materials Engineering, Indian Institute of Science, C V Raman Ave, Bengaluru, Karnataka 560012, India |
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| Abstract: | Hexagonal martensite with well-developed midribs was obtained by iced-brine quenching of Ti44Al4Nb4Hf0.1Si from the beta phase field. Crystallographic characterisation shows great resemblances of the martensite in this alloy to the lenticular martensite in Fe–Ni alloys in the morphology and substructures of martensite plates. It also bears similarities with the martensite in titanium and its alloys in habit planes and orientation relationship with parent phase. Martensitic transformation under the conditions employed in this work was incomplete and the remaining beta phase after martensitic transformation, thus, underwent diffusional beta-to-alpha transformation or massive transformation, depending on the local circumstances. |
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| Keywords: | A. Titanium aluminides, based on TiAl B. Martensitic transformation B. Phase transformation D. Microstructure F. Electron backscatter diffraction F. Electron microscopy, scanning |
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