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Laser Metal Deposition of the Intermetallic TiAl Alloy

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Abstract

Laser metal deposition of the commercial intermetallic Ti-47Al-2Cr-2Nb alloy was investigated. A large number of experiments were conducted under controlled atmosphere by changing the processing parameters to manufacture a series of beads, thin walls, and massive blocks. Optimal process parameters were successfully found to prevent cracking which is generally observed in this brittle material due to built-up residual stresses during fast cooling. These non-equilibrium cooling conditions tend to generate ultra-fine and metastable structures exhibiting high microhardness values, thus requiring post-heat treatments. The latter were successfully used to restore homogeneous lamellar or duplex microstructures and to relieve residual stresses. Subsequent tensile tests enabled us to validate the soundness and homogeneity of the Intermetallic TiAl alloy. Finally, a higher mechanical performance was achieved for the LMD material with respect to cast+HIP and EBM counterparts.

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Acknowledgments

The authors would like to acknowledge the FRAE (Fondation de Recherche en Aéronautique et Espace) institution for their financial support.

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Authors and Affiliations

  1. ONERA – The French Aerospace Lab, 92322, Châtillon, France

    Marc Thomas

  2. ENSAM ParisTech, 75013, Paris, France

    Thierry Malot

  3. Den – Service d’Etudes Analytiques et de Réactivité des Surfaces (SEARS), CEA, Université Paris-Saclay, 91191, Gif sur Yvette, France

    Pascal Aubry

Authors
  1. Marc Thomas
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  2. Thierry Malot
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Correspondence to Marc Thomas.

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Manuscript submitted August 12, 2016.

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Thomas, M., Malot, T. & Aubry, P. Laser Metal Deposition of the Intermetallic TiAl Alloy. Metall Mater Trans A 48, 3143–3158 (2017). https://doi.org/10.1007/s11661-017-4042-9

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