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Elasto-viscoplastic tensile behavior of as-forged Ti-1023 alloy: Experiments and micromechanical modeling

Abstract : This works focused on the mechanical behavior of an 'as-forged' Ti-1023 alloy used in airframe forging applications. Its microstructure, characterized by SEM and EBSD, was composed by 15% of primary α p nodules (2-5 μm in size) embedded in millimeter long β grains partially fragmented into equiaxed β subgrains of 5-10 μm. Further neutron diffraction analysis indicated an almost random β texture. Tensile tests at different strain rates were performed. A very low strain rate sensitivity was observed. The contribution of each phase to the overall mechanical behavior was numerically investigated by a two-phase elasto-viscoplastic self-consistent (EVPSC) model with affine-type linearization. Internal stresses arising from elastic and plastic strain incompatibilities were analyzed. Throughout the mechanical loading, {100} β oriented grains were more deformed than {111} β grains and all the α nodules. The onset of plasticity occurred sequentially in the β phase, initially in {110} β grains followed by {111} β and then {100} β ones. The effect of the crystallographic texture on slip activity was also studied through simulations made with a synthetic rotated cube β texture, typical of β-working, while considering α textures in Burgers Orientation Relationship (BOR) with the β phase or being random.
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https://hal.univ-lorraine.fr/hal-02573610
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Submitted on : Thursday, May 14, 2020 - 2:12:26 PM
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Safaa Lhadi, Ravi Raj Purohit Purushottam Raj Purohit, Thiebaud Richeton, Nathalie Gey, Stéphane Berbenni, et al.. Elasto-viscoplastic tensile behavior of as-forged Ti-1023 alloy: Experiments and micromechanical modeling. Materials Science and Engineering A- Structural Materials Properties Microstructure and Processing, Elsevier, 2020, 787 (139491), ⟨10.1016/j.msea.2020.139491⟩. ⟨hal-02573610⟩

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