In:
MATEC Web of Conferences, EDP Sciences, Vol. 321 ( 2020), p. 11090-
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.
Type of Medium:
Online Resource
ISSN:
2261-236X
DOI:
10.1051/matecconf/202032111090
Language:
English
Publisher:
EDP Sciences
Publication Date:
2020
detail.hit.zdb_id:
2673602-0
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