An investigation by interactive electron backscatter pattern analysis of processing and superplasticity in an aluminum-magnesium alloy
Authors
McNelley, T.R.
McMahon, M.E.
Subjects
Advisors
Date of Issue
1996-08-01
Date
Publisher
Springer
Language
en_US
Abstract
Tensile specimens from an Al-10Mg-0.1Zr alloy, thermomechanically processed (TMP) according to two different schedules and deformed superplastically at 300 C, were examined using electron backscatter pattern (EBSP) imaging in the scanning electron microscope (SEM) with computer-aided analysis. The TMP schedules differed only in the duration of the interpass anneal (IPA) time between successive rolling passes. Microtexture, grain misorientation angle distribution, and grain boundary character were analyzed for both undeformed grip and deformed gage sections of these tensile specimens. Microtexture analysis revealed the same texture components, primarily brass and S, in the undeformed grip sections of both TMP materials, while analysis of deformed gage sections revealed only a decrease in texture with no new components evident. Material processed with a prolonged IPA time exhibited highly superplastic response and contained a high proportion of boundaries of 5 to 15 deg misorientation. Material processed with a short IPA time exhibited lower superplastic elongations and contained higher-order twin boundaries, suggesting that the twin chain mechanism is active during TMP. The observed difference in tensile behavior appears to be the result of extended recovery during TMP of the more ductile material evidenced by the development of a greater proportion of boundaries of 5 to 15 deg misorientation.
Type
Article
Description
The article of record as published may be found at http://dx.doi.org/101007/BF02651879
Series/Report No
Department
Organization
Naval Postgraduate School (U.S.)
Identifiers
NPS Report Number
Sponsors
USDOE
Funder
Format
Citation
Journal Name: Metallurgical Transactions, A; Journal Volume: 27; Journal Issue: 8; Other Information: PBD: Aug 1996
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.