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Development of a TiAl Alloy by Spark Plasma Sintering

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Abstract

Spark plasma sintering (SPS) is a consolidated powder metallurgy process for which the powder sintering is achieved through an applied electric current. The present article aims to describe the method we employed to develop a TiAl-based alloy adjusted for this SPS process. Owing to its enhanced mechanical properties, this alloy was found to fully match the industrial specifications for the aeronautic and automotive industries, which require a high strength at high temperature and a reasonably good ductility at room temperature. A step-by-step method was followed for this alloy development. Starting from a basic study on the as-SPSed GE alloy (Ti-48Al-2Cr-2Nb) in which the influence of the microstructure was studied, the microstructure-alloy composition relationships were then investigated to increase the mechanical properties. As a result of this study, we concluded that tungsten had to be the major alloying element to improve the resistance at high temperature and a careful addition of boron would serve the properties at room temperature. Thus, we developed the IRIS alloy (Ti-48Al-2W-0.08B). Its microstructure and mechanical properties are described here.

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Acknowledgements

This study has been conducted in the framework of the cooperative Projects “IRIS-ANR-09-MAPR-0018-06” supported by the French Agence Nationale de la Recherche (ANR) and the “ALTIAERO” Project of the “IDEX-ATS” program supported by the Université Fédérale-Toulouse Midi-Pyrénées, which are acknowledged. The CEMES group thanks the PNF2 for providing SPS facilities (Plateforme Nationale de Frittage Flash/CNRS in Toulouse, France).

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Authors and Affiliations

  1. CNRS, CEMES (Centre d’Elaboration de Matériaux et d’Etudes Structurales), BP 94347, 29 rue J. Marvig, 31055, Toulouse, France

    Alain Couret, Thomas Voisin & Jean-Philippe Monchoux

  2. ONERA/DMAS, 29 Avenue de la Division Leclerc, BP 72, 92322, Châtillon Cedex, France

    Marc Thomas

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  1. Alain Couret
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  2. Thomas Voisin
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  3. Marc Thomas
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  4. Jean-Philippe Monchoux
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Correspondence to Alain Couret.

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Couret, A., Voisin, T., Thomas, M. et al. Development of a TiAl Alloy by Spark Plasma Sintering. JOM 69, 2576–2582 (2017). https://doi.org/10.1007/s11837-017-2549-6

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  • DOI: https://doi.org/10.1007/s11837-017-2549-6

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