Texture analysis of the transition from slip to grain boundary sliding in a continously recrystallized superplastic aluminum alloy
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Authors
Pérez-Prado, M.T.
McNelley, T.R.
Swisher, D.L.
González-Doncel, G.
Ruano, O.A.
Subjects
Aluminum alloys
Recrystallization and recovery
Grain boundaries
Creep
Superplasticity
Recrystallization and recovery
Grain boundaries
Creep
Superplasticity
Advisors
Date of Issue
2003
Date
Publisher
Elsevier
Language
Abstract
An investigation was conducted into the phenomenon of continuous recrystallization in a
superplastic Al-/5%Ca-/5%Zn alloy. The as-processed microstructure includes adjacent regions that
have lattice orientations corresponding to the symmetric variants of the most prominent texture
component, {2 2 5}<5 5 4). This orientation is near the copper, or C, component, {1 1 2}<1 1 1). A
cellular dislocation structure with highly disoriented cell walls was present within these regions.
Continuous recrystallization during static annealing resulted in the development of distinct
boundaries accompanied by retention and sharpening of the texture and the
development of a bimodal grain boundary disorientation distribution. The high-angle boundaries (50
-/62.88) are the interfaces between grains having lattice orientations as symmetric variants of the
texture, while the low-angle boundaries (2 -/158) correspond to a cellular structure within the
variants. Such a structure persists during superplastic deformation over a wide range of
temperature and strain rate conditions. Both dislocation creep and grain boundary sliding operate
simultaneously in response to the applied stress under all testing conditions investigated. The
relative contribution of each of these mechanisms varies depending on the testing conditions. This
is a consequence of the presence of the variants in the microstructure and their persistence during
deformation. Fiber texture formation was not observed during either longitudinal or transverse
deformation.
Type
Article
Description
Series/Report No
Department
Mechanical and Aerospace Engineering
Organization
Naval Postgraduate School (U.S.)
Identifiers
NPS Report Number
Sponsors
Spanish Commission of Science and Technology (CICYT)
Spanish Ministry of Science and Technology
Spanish Ministry of Science and Technology
Funder
Grant MAT 97/0700
Format
15 p.
Citation
M.T. Pérez-Prado, T.R. McNelley, D.L. Swisher, G. González-Doncel, O.A. Ruano, "Texture analysis of the transition from slip to grain boundary sliding in a continuously recrystallized superplastic aluminum alloy," Materials Science and Engineering, v. A342,(2003), pp. 216-230.
Distribution Statement
Rights
This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.