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Deformation Behavior and Dislocation Mechanisms in Tial Alloys

Published online by Cambridge University Press:  22 February 2011

S. Sriram ,
Vijay K. Vasudevan  and
Dennis M. Dimiduk
S. Sriram
Affiliation:
Dept. of Materials Science and Engineering, University of Cincinnati, Cincinnati, OH 45221 Now at SYSTRAN Corporation, Dayton, OH 45432
Vijay K. Vasudevan
Affiliation:
Dept. of Materials Science and Engineering, University of Cincinnati, Cincinnati, OH 45221
Dennis M. Dimiduk
Affiliation:
Wright Laboratory, Materials Directorate, Wright-Patterson AFB, Dayton, OH 45433-7817
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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.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 364: Symposium L – High-Temperature Ordered Intermetallic Alloys–VI , 1994 , 647
Copyright
Copyright © Materials Research Society 1995

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