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In situ assessment of isochronal phase transformations in a lamellar Ti–5Al–5Mo–5V–3Cr–1Zr alloy using synchrotron X-ray diffraction
- Source :
- Journal of Alloys and Compounds. 853:157105
- Publication Year :
- 2021
- Publisher :
- Elsevier BV, 2021.
-
Abstract
- Phase transformations in a lamellar Ti–5Al–5Mo–5V–3Cr–1Zr (Ti-55531) alloy upon heating at continuous rates of 5, 20 and 100 °C/min has been studied by in situ high energy X-ray diffraction (HEXRD), aided by scanning and transmission electron microscopy, atom probe tomography and hardness measurements. During slow heating, the β phase has shown a behavior suggestive of additional transformations other than the continuous α → β decomposition observed at higher heating rates. Such behavior has been attributed to the precipitation of an embryonic isothermal ω phase. APT analyses have shown that no elemental partitioning occurs between the β matrix and the lamellar α phase, but it does between β and grain boundary α, suggesting that ω phase precipitates with solute rejection in regions outside lamellar colonies embedded in an enriched matrix. Above 500 °C, diffusion becomes significantly enhanced and α decomposition takes place.
- Subjects :
- Materials science
Precipitation (chemistry)
Mechanical Engineering
Alloy
Metals and Alloys
Analytical chemistry
02 engineering and technology
Atom probe
engineering.material
010402 general chemistry
021001 nanoscience & nanotechnology
01 natural sciences
Isothermal process
0104 chemical sciences
law.invention
Mechanics of Materials
law
Transmission electron microscopy
Phase (matter)
Materials Chemistry
engineering
Grain boundary
Lamellar structure
0210 nano-technology
Subjects
Details
- ISSN :
- 09258388
- Volume :
- 853
- Database :
- OpenAIRE
- Journal :
- Journal of Alloys and Compounds
- Accession number :
- edsair.doi...........97a81d3dd61242d8eae3daa6f36a02af