High impact resistance of a TWIP β titanium alloy: linking the multi-scale deformation and fracture mechanisms
| Autor: | Frédéric Prima, Julie Bourgon, Chloé Varenne, Anne-Françoise Gourgues-Lorenzon, Cédrik Brozek, Jacques Besson |
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| Přispěvatelé: | Centre des Matériaux (MAT), MINES ParisTech - École nationale supérieure des mines de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS) |
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Materials science
020502 materials Mechanical Engineering Twip Alloy Titanium alloy 02 engineering and technology Plasticity engineering.material [SPI.MAT]Engineering Sciences [physics]/Materials 0205 materials engineering Mechanics of Materials Fracture (geology) engineering General Materials Science Deformation (engineering) Composite material Crystal twinning ComputingMilieux_MISCELLANEOUS Stress concentration |
| Zdroj: | Journal of Materials Science Journal of Materials Science, Springer Verlag, In press, ⟨10.1007/s10853-020-05582-7⟩ |
| ISSN: | 0022-2461 1573-4803 |
| Popis: | Titanium alloys with twinning- and transformation-induced plasticity effects display promising mechanical properties, particularly, high impact toughness, unlike conventional titanium alloys. This work focuses on a highly strain-hardenable Ti–Cr–Sn alloy displaying both TRIP and TWIP effects upon quasi-static loading and an average impact toughness of 193 J/cm2, which represents nearly three times the measured value for commercial titanium alloys. To account for this extremely high impact toughness, fracture and deformation features were quantified at different scales using scanning electron microscopy and transmission electron microscopy, particularly a Precession-Assisted Crystal Orientation Mapping system. Examinations evidenced the major role of twins in the fracture process, even on a sub-micrometre scale. The high impact resistance and absorbed energy of this alloy are explained by the positive contribution of dynamical refinement of the β grains with sub-twinning structures, whereas severe stress concentration may eventually contribute to ductile fracture, at least locally. |
| Databáze: | OpenAIRE |
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