The role of deformation localization in superplastic flow

The model Zn22%Al alloy is used to show superplastic deformation takes place when localized deformation bands separating the material volume into large grain conglomerates are formed and developed. The formation of these bands is due to the cooperative grain boundary sliding which can be stimulated...

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Bibliographic Details
Published in:Acta metallurgica et materialia 1994-08, Vol.42 (8), p.2617-2622
Main Authors: Astanin, V.V., Kaibyshev, O.A., Faizova, S.N.
Format: Article
Language:English
Subjects:
360103 - Metals & Alloys- Mechanical Properties
ALLOY SYSTEMS
ALLOYS
ALUMINIUM ALLOYS
BINARY ALLOY SYSTEMS
DEFORMATION
GRAIN BOUNDARIES
MATERIALS SCIENCE
MECHANICAL PROPERTIES
MICROSTRUCTURE
PLASTICITY
ZINC ALLOYS
ZINC BASE ALLOYS
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Summary:The model Zn22%Al alloy is used to show superplastic deformation takes place when localized deformation bands separating the material volume into large grain conglomerates are formed and developed. The formation of these bands is due to the cooperative grain boundary sliding which can be stimulated by intragranular sliding. The number and shape of the bands, as well as their contribution to the total elongation (the technique of surface markers was used) depend on strain rate. The movement of grain in the specimen volume takes place by the mutual displacement and rotation of grain conglomerates. The data presented can serve as a basis for the development of general physical theory of superplasticity based on macroscopic and mezoscopic deformation.
ISSN:0956-7151
1873-2879
DOI:10.1016/0956-7151(94)90203-8