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Deformation Behavior and Dislocation Mechanisms in Tial Alloys
Published online by Cambridge University Press: 22 February 2011
Abstract
Polycrystalline Ti-50 and Ti-52A1 (in at.%) alloys, with large grain sizes (50Al-300μm, 52Al-500μm) and containing low (∼250 wt.ppm) levels of oxygen were deformed under compression over a wide temperature range (77-1173°K). The 0.2% proof stress-temperature profiles comprise of three distinct regimes: Regime I (between 77-∼600°K), regime II (between ∼600-1073°K), and regime III (above 1073°K). Deformation temperature influences the types of dislocations present, the nature of superdislocation dissociations, and the morphological characteristics of both ordinary and superdislocations. Collectively, experiment and theory suggest that the flow properties at low temperatures (regime I) are controlled by lattice friction, whereas at higher temperatures (regime II) the properties are dislocation obstacle controlled.
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- Copyright © Materials Research Society 1995
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