Abstract
Microstructure change during hot deformation was studied in β titanium alloys, Ti-10V-2Fe-3Al and Ti-15V-3Cr-3Sn-3Al. After β solution treatments, isothermal compression was performed at various temperatures in the β single-phase and in the (α+β) two-phase region at initial strain rates between 4.2×10-1 ∼- 4.2×10-5 s-1. When the specimens are deformed in the β single phase region, a recovered structure was formed within β grains although discontinuous dynamic crystallization occurs in the vicinity of β grain boundary. When deformation was performed in the (α+β) two-phase region just below the β transus, discontinuous recrystallization around β grain boundary is suppressed due to the pinning effect by grain boundary a precipitate, resulting in a mostly recovered structure. Contrarily, when the specimen is deformed at the temperature where a large amount of α precipitates, dynamic continuous recrystallization occurs uniformly in β matrix, resulting in the formation of (α+β) microduplex structures containing high-angle β boundaries. The size of recrystallized β grain decreases as strain rate increases or deformed temperature is lowered in a good correlation with Zener-Hollomon parameter.
Original language | English |
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Pages (from-to) | 655-660 |
Number of pages | 6 |
Journal | Materials Science Forum |
Volume | 426-432 |
Issue number | 1 |
DOIs | |
Publication status | Published - 2003 |
Externally published | Yes |
Event | Thermec 2003 Processing and Manufacturing of Advanced Materials - Madrid, Spain Duration: 2003 Jul 7 → 2003 Jul 11 |
Keywords
- Dual phase material
- Dynamic recovery
- Dynamic recrystallization
- Hot deformation
- Superplasticity
- β titanium alloy
ASJC Scopus subject areas
- Materials Science(all)
- Condensed Matter Physics
- Mechanics of Materials
- Mechanical Engineering