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Synthesis of γ-TiAl by Reactive Spark Plasma Sintering of Cryomilled Ti and Al Powder Blend, Part I: Influence of Processing and Microstructural Evolution

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Abstract

To provide insight into the influence of an electric field on the kinetics of diffusion, fully lamellar γ-TiAl was processed by a rapid, two-stage, solid-state reactive sintering via spark plasma sintering (SPS) of a cryomilled Ti, Al powder blend. Cryomilling was implemented in the current study to attain a nanostructured grain size in the Ti and Al powder blend, and thereby provide insight into the influence of grain size on the underlying diffusion kinetics. Following a two-step process involving SPS at 873 K (600 °C) for 15 minutes and 1523 K (1250 °C) for 30 minutes, a fully lamellar TiAl alloy, with submicron lamellar spacing, was successfully obtained. Microstructural refinement in the Ti and Al powders during cryomilling led to an increase in solid-state diffusion, and the underlying mechanisms are discussed in detail.

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Acknowledgments

The experimental support and advice provided by Ertorer Osman, Haiming Wen, Yizhang Zhou, and Baolong Zheng is greatly appreciated. The authors would like to thank the management of General Motors for supporting this research. EJL would also like to thank the support from National Science Foundation with a grant number NSF DMR-1210437.

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Author notes

  1. Kaustubh Kulkarni (Researcher, Assistant Professor)

    Present address: Department of Materials Science and Engineering, Indian Institute of Technology, Kanpur, 208016, U.P., India

Authors and Affiliations

  1. Department of Chemical Engineering and Materials Science, University of California, Davis, CA, 95616, USA

    Yu Sun (Post-Doctoral Researcher) & Enrique J. Lavernia (Professor)

  2. India Science Lab, General Motors Global R&D, Bangalore, 560066, India

    Kaustubh Kulkarni (Researcher, Assistant Professor)

  3. Chemical Sciences and Materials Systems Lab, GM Global R&D Center, Warren, MI, USA

    Anil K. Sachdev (Lab Group Manager)

Authors
  1. Yu Sun
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  2. Kaustubh Kulkarni
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  3. Anil K. Sachdev
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  4. Enrique J. Lavernia
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Corresponding author

Correspondence to Yu Sun.

Additional information

Manuscript submitted July 6, 2013.

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Sun, Y., Kulkarni, K., Sachdev, A.K. et al. Synthesis of γ-TiAl by Reactive Spark Plasma Sintering of Cryomilled Ti and Al Powder Blend, Part I: Influence of Processing and Microstructural Evolution. Metall Mater Trans A 45, 2750–2758 (2014). https://doi.org/10.1007/s11661-014-2215-3

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