In-situ investigation of phase transformations in ultra-fine grained Ti15Mo alloy
A metastable ß solution treated Ti15Mo alloy was deformed by high pressure torsion (HPT) resulting in a severely deformed microstructure with high density of lattice defects. In order to gain insight into the kinetics of phase transformations, both non-deformed and HPT-deformed materials were studie...
| Autores: | , , , , , , , |
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| Tipo de recurso: | artículo |
| Fecha de publicación: | 2021 |
| País: | España |
| Institución: | Universitat Politècnica de Catalunya (UPC) |
| Repositorio: | UPCommons. Portal del coneixement obert de la UPC |
| Idioma: | inglés |
| OAI Identifier: | oai:upcommons.upc.edu:2117/387353 |
| Acceso en línea: | https://hdl.handle.net/2117/387353 https://dx.doi.org/10.1016/j.jallcom.2021.159027 |
| Access Level: | acceso abierto |
| Palabra clave: | Titanium alloys Titani -- Aliatges Àrees temàtiques de la UPC::Enginyeria dels materials |
| Sumario: | A metastable ß solution treated Ti15Mo alloy was deformed by high pressure torsion (HPT) resulting in a severely deformed microstructure with high density of lattice defects. In order to gain insight into the kinetics of phase transformations, both non-deformed and HPT-deformed materials were studied in-situ during linear heating; phase evolution was investigated using high energy synchrotron X-ray diffraction (HEXRD) complemented by the measurement of electrical resistance. It was shown that in the non-deformed material the dissolution of the ¿ phase is followed by precipitation of the a phase during linear heating. In contrast, in the HPT-deformed material the nucleation of the a phase is shifted to lower temperatures, resulting in the coexistence of all three ß, ¿, and a phases at ~550 °C. Moreover, in HPT-deformed samples, the growth of a particles is accelerated due to high density of dislocations and grain boundaries. Post-mortem observations of selected samples revealed that the microstructure of the HPT-deformed material after heating up to 650 °C remains ultra-fine grained with equiaxed grains of a phase. |
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