Solid-State Phase Transformations in Thermally Treated Ti-6Al-4V Alloy Fabricated via Laser Powder Bed Fusion.
Materials (Basel)
; 12(18)2019 Sep 06.
Article
en En
| MEDLINE
| ID: mdl-31489893
Laser Powder Bed Fusion (LPBF) technology was used to produce samples based on the Ti-6Al-4V alloy for biomedical applications. Solid-state phase transformations induced by thermal treatments were studied by neutron diffraction (ND), X-ray diffraction (XRD), scanning transmission electron microscopy (STEM) and energy-dispersive spectroscopy (EDS). Although, ND analysis is rather uncommon in such studies, this technique allowed evidencing the presence of retained ß in α' martensite of the as-produced (#AP) sample. The retained ß was not detectable by XRD analysis, nor by STEM observations. Martensite contains a high number of defects, mainly dislocations, that anneal during the thermal treatment. Element diffusion and partitioning are the main mechanisms in the α â ß transformation that causes lattice expansion during heating and determines the final shape and size of phases. The retained ß phase plays a key role in the α' â ß transformation kinetics.
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1
Colección:
01-internacional
Base de datos:
MEDLINE
Idioma:
En
Revista:
Materials (Basel)
Año:
2019
Tipo del documento:
Article
País de afiliación:
Italia
Pais de publicación:
Suiza