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Fe-stabilized duplex α/β microstructure containing γ titanium hydride in Ti grade 2 obtained by volumetrically incomplete phase transition
- Source :
- Materials Characterization. 153:128-135
- Publication Year :
- 2019
- Publisher :
- Elsevier BV, 2019.
-
Abstract
- The aim of this work is to characterize microstructure of commercially pure titanium grade 2 (Ti grade 2), which is formed by volumetrically incomplete α/β phase transition. This duplex α/β microstructure is formed by cooling Ti grade 2 once the β phase is nucleated at sites where nucleation is more favorable (e.g. grain boundaries, areas with higher Fe concentration). After cooling, the remaining small fraction of β phase is stabilized by the iron content, which was introduced to the β phase via its diffusion during annealing. The morphology and distribution of the secondary α phase lamellae and the residual β phase greatly affects the achievable ductility and character of the fracture of this material. Observed fracture mechanism significantly differs from the common one, as the samples are fractured by a large number of parallel cracks. Apart from the residual β phase, locally stabilized down to the room temperature, the presence of face-centered tetragonal γ titanium hydride (γ-TiH) was observed. Although the main nucleation site of these hydrides was found to be the α/β interface, the presence of γ-TiH was also observed in α grains interior. This work aims to discuss negative effects of volumetrically incomplete phase transition in Ti grade 2, as well as to provide detailed microstructural characterization.
- Subjects :
- 010302 applied physics
Phase transition
Materials science
Annealing (metallurgy)
Mechanical Engineering
Nucleation
Titanium hydride
02 engineering and technology
021001 nanoscience & nanotechnology
Condensed Matter Physics
Microstructure
01 natural sciences
Crystallography
Tetragonal crystal system
chemistry.chemical_compound
chemistry
Mechanics of Materials
Duplex (building)
0103 physical sciences
General Materials Science
Grain boundary
0210 nano-technology
Subjects
Details
- ISSN :
- 10445803
- Volume :
- 153
- Database :
- OpenAIRE
- Journal :
- Materials Characterization
- Accession number :
- edsair.doi...........b37195412b5fbbe277bb486e04f22204
- Full Text :
- https://doi.org/10.1016/j.matchar.2019.04.045