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Communication Dans Un Congrès Année : 2023

Effect of silicon addition on deformation mechanisms of near alpha titanium alloys

Résumé

In this paper we investigate the mechanism of strengthening in Si reinforced Ti6244 alloys. As the beneficial or detrimental effect of silicide precipitation is still debated, we bring some deeper understanding of the effect of Si in near- titanium alloys. In order to provide some insights, extensive characterizations have been carried out at two scales: the effect of Si has been analyzed with multiple tensile tests at room temperature and at 650 °C; then, the population of silicides has been analyzed on as received or aged samples by FIB-SEM 3D reconstruction, to determine their morphology, size and distribution; and also by TEM, to identify the nature of the precipitates as well as their interaction with dislocations. We show that by playing with the silicon content we observe copious precipitation of silicides. And that they play an important role in the high temperature mechanical properties (creep) following an Orowan mechanism.
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Dates et versions

hal-04151918 , version 1 (05-07-2023)

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  • HAL Id : hal-04151918 , version 1

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Thibaut Armanni, Frédéric Fossard, Jean-Sébastien Mérot, Thierry Douillard, Camille Liard, et al.. Effect of silicon addition on deformation mechanisms of near alpha titanium alloys. World Titanium Conference 2023, Jun 2023, EDIMBOURG, France. ⟨hal-04151918⟩
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