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Experimental and DFT characterization of interphase boundaries in titanium and the implications for ω-assisted α phase precipitation
- Source :
- Acta Materialia. 151:406-415
- Publication Year :
- 2018
- Publisher :
- Elsevier BV, 2018.
-
Abstract
- An intricate understanding of the fundamental β→α phase transformation upon the presence of metastable ω phase is vital for tailoring the multiphase microstructures of titanium and titanium alloys for various specific applications. To approach this, the structures and energetics of heterophase interfaces among α, β, and ω in titanium were thoroughly investigated, using the combination of high-resolution transmission electron microscopy and first-principles density functional theory calculations. The results strongly suggest that metastable ω does not necessarily act as the precursor of α but can reduce the energy barrier for α nucleation in β. The ω/β interfaces acts as favorable nucleation sites for α which, once forms, tends to grow favorably into the β matrix. These findings validate the ω-assisted α nucleation mechanism, and adequately rationalize many TEM observations on titanium alloys.
- Subjects :
- 010302 applied physics
Materials science
Polymers and Plastics
Precipitation (chemistry)
Metals and Alloys
Nucleation
chemistry.chemical_element
Titanium alloy
02 engineering and technology
021001 nanoscience & nanotechnology
01 natural sciences
Surface energy
Electronic, Optical and Magnetic Materials
chemistry
Chemical physics
Phase (matter)
0103 physical sciences
Ceramics and Composites
Interphase
Density functional theory
0210 nano-technology
Titanium
Subjects
Details
- ISSN :
- 13596454
- Volume :
- 151
- Database :
- OpenAIRE
- Journal :
- Acta Materialia
- Accession number :
- edsair.doi...........f16d02a20b144c2edae67bd787ef008f