In situ characterization of a high work hardening Ti-6Al-4V prepared by electron beam melting

0511691 - ÚFM 2020 RIV GB eng J - Článek v odborném periodiku
Sofinowski, K. - Smid, M. - Kuběna, Ivo - Vives, M. - Casati, N. - Godet, S. - Van Swygenhoven, H.
In situ characterization of a high work hardening Ti-6Al-4V prepared by electron beam melting.
Acta Materialia. Roč. 179, OCT (2019), s. 224-236. ISSN 1359-6454. E-ISSN 1873-2453
Grant CEP: GA MŠMT(CZ) EF16_013/0001823
Institucionální podpora: RVO:68081723
Klíčová slova: mechanical-properties * titanium-alloy * tensile deformation * heat-treatment * microstructure * ductility * behavior * slip * martensite * systems * Titanium alloy * Additive manufacturing * In situ tension test * X-ray diffraction (XRD) * Digital image correlation
Obor OECD: Audio engineering, reliability analysis
Impakt faktor: 7.656, rok: 2019
Způsob publikování: Open access
https://doi.org/10.1016/j.actamat.2019.08.037

A multi-phase Ti-6Al-4V prepared by electron beam melting and thermal post treatments has been shown to exhibit increased strength and ductility over standard wrought or hot isostatic pressed Ti-6-Al-4V. The mechanical improvements are due to a prolonged, continuous work hardening effect not commonly observed in Ti alloys. In situ x-ray diffraction and high resolution digital image correlation are used to examine the strain partitioning between the phases during tensile loading with post-mortem electron microscopy to characterize the deformation behavior in each phase. Specimens heat treated between 850 and 980 degrees C were tested and the effect of annealing temperature on the micromechanical response is discussed. It is shown that the work hardening is the result of composite load-sharing behavior between three mechanically distinct microstructures: large a lamellae and a martensitic region of fine acicular alpha' and a third phase not previously reported in this alloy. (C) 2019 Acta Materialia Inc. Published by Elsevier Ltd.
Trvalý link: http://hdl.handle.net/11104/0302475