Journal
ACTA MATERIALIA
Volume 179, Issue -, Pages 224-236Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2019.08.037
Keywords
Titanium alloy; Additive manufacturing; In situ tension test; X-ray diffraction (XRD); Digital image correlation
Funding
- European Research Council within the ERC Advanced Grant MULTIAX [339245]
- ERC
- Ministry of Education, Youth, and Sports of the Czech Republic [CZ.02.1.01/0.0/0.0/16_013/0001823]
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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.
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