Experimental verification of grain boundary-sliding controlled steady state superplastic flow in both continually and statically recrystallizing Al alloys

The complex microstructural changes following superplastic deformation in statically and continually recrystallizing Al-alloys are examined. Al alloy, AA 2004, exhibits continual recrystallization during deformation, whereas in two other alloys, AA 5456 and AA 7020, static recrystallization leads to...

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Bibliographic Details
Published in:Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 2016-03, Vol.657, p.185-196
Main Authors: Arun Babu, K., Subramanya Sarma, V., Athreya, C.N., Padmanabhan, K.A.
Format: Article
Language:English
Subjects:
Aluminum base alloys
Cooperative boundary sliding
Crystallographic texture
Dynamic recrystallization
Grains
Microstructure
Plastic deformation
Recrystallization
Static recrystallization
Superplastic deformation
Superplastic forming
Superplasticity
Texture
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Summary:The complex microstructural changes following superplastic deformation in statically and continually recrystallizing Al-alloys are examined. Al alloy, AA 2004, exhibits continual recrystallization during deformation, whereas in two other alloys, AA 5456 and AA 7020, static recrystallization leads to the formation of equiaxed grains prior to the onset of superplastic deformation. Other features such as grain growth, grain rotation, dislocation accumulation and their influence on texture evolution during superplastic deformation are investigated. The observations clearly suggest that grain boundary sliding is the rate controlling process during steady state superplastic deformation.
ISSN:0921-5093
1873-4936
DOI:10.1016/j.msea.2016.01.054