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Microstructure characterization of high temperature mechanisms in a Nb–Ti–Si alloy

Abstract : The deformation mechanisms of an Nb–20Si–25Ti–6Al–3Cr–3Mo alloy deformed in compression at 1000 ◦C and at a strain rate of 10−4 s−1 have been investigated, using focused ion beam and transmission electron microscopy techniques. The initial microstructure of the alloy was constituted of a solid solution bcc Nbss matrix and of Nb5Si3 phases of β (tetragonal) and γ (hexagonal) crystallographic structures, with also hcp-Ti precipitates. As expected, the only phase which exhibited plastic deformation at 1000 ◦C was the Nbss matrix. Glide of Burgers vector b = 1/2 <111> dislocations has been observed, in planes compatible with {112} and {123} planes, or with cross-slip in {110} planes, as classically reported in bcc structures. Conversely, climb contribution has not been evidenced, probably because of rearrangement of the climbing dislocations in sub-boundaries. Fine δ-Nb11Si4 precipitates have been detected in the samples compressed at 1000 ◦C. Interactions of the δ-Nb11Si4 precipitates with the dislocations have been observed, which can potentially lead to strengthening of the Nbss phase.
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Submitted on : Friday, February 25, 2022 - 10:02:06 AM
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David Reyes, Virgil Malard, Stefan Drawin, Alain Couret, Jean-Philippe Monchoux. Microstructure characterization of high temperature mechanisms in a Nb–Ti–Si alloy. Intermetallics, Elsevier, 2022, 144, pp.107509. ⟨10.1016/j.intermet.2022.107509⟩. ⟨hal-03588670⟩

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