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Stress partitioning in a near-β Titanium alloy induced by elastic and plastic phase anisotropies: experimental and modeling

Abstract : The load transfer induced by the elastic and plastic phase anisotropies of a Ti–10V–2Fe–3Al titanium alloy is studied. The microstructure consists in α nodules embedded in elongated β grains. EBSD performed on the alloy shows no crystallographic texture neither for α nor β phase. Tensile tests along the elongation direction, at a strain rate of 2 x 10-3 s-1 give a yield stress of 830 MPa with 13% ductility. Simulations based on an advanced two-phase polycrystalline elasto-viscoplastic self-consistent (EVPSC) model predict that the β phase first plastifies with a sequential onset of plasticity starting from <110> oriented β grains, then <111> and finally <100> oriented β grains. This leads to a strong load transfer from the β grains to the α nodules whose average behavior remains elastic up to high stresses (~940 MPa). However, additional simulations considering exclusively β grains of specific orientation show that the behavior of α nodules is strongly dependent on the β texture in which they are embedded. Especially, in <001> β grains, which plastify the latest, the model predicts the onset of plasticity in favorably orientated α nodules. Moreover, the orientation spread within the β grains can modify the average plastic behavior of α phase. In future, these results will be compared to data obtained from in-situ High Energy XRD and SEM/EBSD experiments.
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https://hal-cnrs.archives-ouvertes.fr/hal-02381002
Contributor : Nathalie Gey <>
Submitted on : Monday, January 11, 2021 - 5:22:35 PM
Last modification on : Wednesday, January 13, 2021 - 3:16:44 AM

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Ravi Raj Purohit Purushottam Raj Puhorit, Safaa Lhadi, Nathalie Gey, Olivier Castelnau, Thiebaud Richeton, et al.. Stress partitioning in a near-β Titanium alloy induced by elastic and plastic phase anisotropies: experimental and modeling. The 14th World Conference on Titanium, Jun 2019, Nantes, France. pp.11090, ⟨10.1051/matecconf/202032111090⟩. ⟨hal-02381002v2⟩

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