On the high creep strength of the W containing IRIS-TiAl alloy at 850°C - Physique de la Plasticité et Métallurgie Accéder directement au contenu
Article Dans Une Revue Acta Materialia Année : 2019

On the high creep strength of the W containing IRIS-TiAl alloy at 850°C

Résumé

This paper presents a study of the creep at 850°C under 150 MPa of the IRIS alloy (Ti-Al48-W2-B0.1) densified by spark plasma sintering. The dislocation microstructure in a sample strained up to 1.5% was studied by post-mortem transmission electron microscopy. The deformation is mainly due to ordinary dislocations. Several populations of dislocations are evidenced. Their Burgers vectors, the plane in which they are moving and the corresponding deformation mechanisms are determined. In the discussion section, the deformation mechanisms, the factors controlling their activation and the role of tungsten as hardening element are examined.
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Dates et versions

hal-02391806 , version 1 (03-12-2019)

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Alain Couret, Jean-Philippe Monchoux, Daniel Caillard. On the high creep strength of the W containing IRIS-TiAl alloy at 850°C. Acta Materialia, 2019, 181, pp.331-341. ⟨10.1016/j.actamat.2019.09.056⟩. ⟨hal-02391806⟩
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