Deformation parameters governing tensile elongation for a mechanically milled Al–1.1at.%Mg–1.2at.%Cu alloy tested in tension at constant true strain rates
✍ Scribed by T. Hasegawa; T. Takahashi; K. Okazaki
- Book ID
- 104402239
- Publisher
- Elsevier Science
- Year
- 2000
- Tongue
- English
- Weight
- 292 KB
- Volume
- 48
- Category
- Article
- ISSN
- 1359-6454
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✦ Synopsis
AbstractÐFor a mechanically milled Al±1.1at.%Mg±1.2at.%Cu alloy, tensile deformation was carried out at temperatures of 523±823 K and at true strain rates of 1 Â 10 À3 ±5 Â 10 0 asX The analysis of true stress± true strain curves from a dislocation dynamics viewpoint showed that a large value of re-mobilization probability of unlocked immobile dislocations O is mainly responsible for an enormous elongation (1.3 in true strain) observed at an intermediate strain rate (10 0 /s) and temperature (748 K). Discussion on thermally activated process for O and dislocation kinetics indicated that the suppression of plastic instability leading to superplastic elongation is controlled by liberating immobile dislocations from a solute atmosphere. The strain rate sensitivity m was formulated on a basis of dislocation dynamics, and a relation of OAm 2 was found to hold between them.