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Microstructural Control of Ti-Al-Nb-W-B Alloys

  • SYMPOSIUM - Deformation and Fracture from Nano to Macro: Honoring W.W. Gerberich's 70th Birthday
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In this work, new TiAl alloys containing W, B, and Nb have been developed. Fine uniform microstructures, with colony size smaller than 50 μm, can be conveniently obtained after hot-isostatic pressing (HIP) and homogenization treatment without any grain-refining processes using hot deformation. The effects of tungsten and boron on the microstructure of the TiAl alloys, including the colony size and lamellar spacing, were analyzed. This work shows that a small additional amount of W can refine the grain size of the Ti-Al-Nb-W-B alloys. The lamellar spacing also decreases with increasing W concentration. When the amount of W is greater than 0.4 at. pct, the β phase is stabilized and remains at room temperature, which can degrade the ductility of the alloy. Mechanical properties, such as the hardness of the alloy, can be increased by the addition of the alloying element through the solution strengthening and refinement of the grain size.

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Acknowledgments

The present research is sponsored by the Fossil Energy Materials Program, with Drs. R. Judkins and J. Zollar as program managers, under Contract No. 11X-SP173V, and the National Science Foundation Combined Research-Curriculum Development (CRCD) Program, with Ms. Mary Poats as the contract monitor, under Contract No. EEC-0203415.

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Authors and Affiliations

  1. Department of Materials Science and Engineering, The University of Tennessee, Knoxville, TN, 37996-2200, USA

    L. Huang (Graduate Assistant), P. K. Liaw (Professor) & C. T. Liu (Professor)

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  1. L. Huang
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  2. P. K. Liaw
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  3. C. T. Liu
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Correspondence to L. Huang.

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This article is based on a presentation given in the symposium entitled “Deformation and Fracture from Nano to Macro: A Symposium Honoring W.W. Gerberich’s 70th Birthday,” which occurred during the TMS Annual Meeting, March 12-16, 2006 in San Antonio, Texas and was sponsored by the Mechanical Behavior of Materials and Nanomechanical Behavior Committees of TMS.

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Huang, L., Liaw, P.K. & Liu, C.T. Microstructural Control of Ti-Al-Nb-W-B Alloys. Metall Mater Trans A 38, 2290–2297 (2007). https://doi.org/10.1007/s11661-007-9113-x

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  • DOI: https://doi.org/10.1007/s11661-007-9113-x

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