Metallurgical and Materials Transactions A

, Volume 47, Issue 12, pp 6097–6108 | Cite as

Mechanical Properties of the TiAl IRIS Alloy

  • Thomas Voisin
  • Jean-Philippe Monchoux
  • Marc Thomas
  • Christophe Deshayes
  • Alain Couret
Article

Abstract

This paper presents a study of the mechanical properties at room and high temperature of the boron and tungsten containing IRIS alloy (Ti-48Al-2W-0.08B at. pct). This alloy was densified by Spark Plasma Sintering (SPS). The resultant microstructure consists of small lamellar colonies surrounded by γ regions containing B2 precipitates. Tensile tests are performed from room temperature to 1273 K (1000 °C). Creep properties are determined at 973 K (700 °C)/300 MPa, 1023 K (750 °C)/120 MPa, and 1023 K (750 °C)/200 MPa. The tensile strength and the creep resistance at high temperature are found to be very high compared to the data reported in the current literature while a plastic elongation of 1.6 pct is preserved at room temperature. A grain size dependence of both ductility and strength is highlighted at room temperature. The deformation mechanisms are studied by post-mortem analyses on deformed samples and by in situ straining experiments, both performed in a transmission electron microscope. In particular, a low mobility of non-screw segments of dislocations at room temperature and the activation of a mixed-climb mechanism during creep have been identified. The mechanical properties of this IRIS alloy processed by SPS are compared to those of other TiAl alloys developed for high-temperature structural applications as well as to those of similar tungsten containing alloys obtained by more conventional processing techniques. Finally, the relationships between mechanical properties and microstructural features together with the elementary deformation mechanisms are discussed.

Keywords

Spark Plasma Sinter Creep Strength TiAl Alloy Electron Beam Melting Minimum Creep Rate 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgments

This study has been conducted in the framework of the cooperative project “IRIS-ANR-09-MAPR-0018-06” supported by the French Agence Nationale de la Recherche (ANR), which is acknowledged. The CEMES group thanks the PNF2 for providing SPS facilities (Plateforme Nationale de Frittage Flash/CNRS in Toulouse, France).

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Copyright information

© The Minerals, Metals & Materials Society and ASM International 2016

Authors and Affiliations

  • Thomas Voisin
    • 1
    • 3
  • Jean-Philippe Monchoux
    • 1
  • Marc Thomas
    • 2
  • Christophe Deshayes
    • 1
  • Alain Couret
    • 1
  1. 1.CNRS; CEMES (Centre d’Elaboration de Matériaux et d’Etudes Structurales)ToulouseFrance
  2. 2.ONERA/DMSMChâtillon CedexFrance
  3. 3.Department of Materials Science and EngineeringJohns Hopkins UniversityBaltimoreUSA

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