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.
Originalsprache | englisch |
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Aufsatznummer | 157105 |
Fachzeitschrift | Journal of Alloys and Compounds |
Jahrgang | 853 |
DOIs | |
Publikationsstatus | Veröffentlicht - 5 Feb. 2021 |
ASJC Scopus subject areas
- Werkstoffmechanik
- Maschinenbau
- Metalle und Legierungen
- Werkstoffchemie
Fields of Expertise
- Advanced Materials Science