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Article Dans Une Revue JOM Journal of the Minerals, Metals and Materials Society Année : 2017

Development of a TiAl Alloy by Spark Plasma Sintering

Résumé

Spark Plasma Sintering (SPS) is a consolidated powder metallurgy process for which the powder sintering is achieved through an applied electric current. The present paper aims at describing 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 aeronautic and automotive industries that 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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Dates et versions

hal-01907525 , version 1 (29-10-2018)

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Alain Couret, Thomas Voisin, Marc Thomas, Jean-Philippe Monchoux. Development of a TiAl Alloy by Spark Plasma Sintering. JOM Journal of the Minerals, Metals and Materials Society, 2017, 69 (12), pp.2576 - 2582. ⟨10.1007/s11837-017-2549-6⟩. ⟨hal-01907525⟩
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