Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 527, Issue 29-30, Pages 7624-7630Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2010.08.015
Keywords
Stacking fault energy; Severe plastic deformation; Cold rolling; Grain refinement; Twinning; Dislocations
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Funding
- Indo-US Science and Technology Forum (IUSSTF)
- Deutsche Forschungsgemeinschaft (DFG) [FR 1714/5-1]
- US Army Research Office [W911NF-09-1-0427]
- US Army Research Laboratory [W911QX-08-C-0083]
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The effectiveness of the cryogenic (CT) rolling vis-a-vis room temperature (RT) rolling on strengthening is significantly affected by stacking fault energy (SFE) and there is an optimum SFE at which CT rolling is most effective. Studies on Al, Al alloy AA6061, Cu, Cu-4.6Al, Cu-9Al and Cu-15Al (in at.%) alloys revealed that in metals with very high and very low SFEs, the strength difference between CT and RT rolled samples is <10%. The Cu-4.6Al alloy with an intermediate SFE revealed maximum enhancement of strength (25-30%). These results are explained by changes in deformation mechanisms with SFE and temperature. High SFE metals deformed by dislocation slip and low SFE metals deformed by twinning during CT and RT rolling. Metals with intermediate SFEs deformed by twinning during CT rolling but by dislocation slip during RT rolling, and this makes the CT rolling most effective over RT rolling in enhancing the strength. (C) 2010 Elsevier B.V. All rights reserved.
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