Superplasiticity in thermomechanically processed high magnesium aluminum-magnesium alloys
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Authors
Becker, John J.
Subjects
Superplasticity
Aluminum
Aluminum-magnesium
Thremomechanical processing
Rolling
Annealing
Recrystallization
Grain refinement
Aluminum
Aluminum-magnesium
Thremomechanical processing
Rolling
Annealing
Recrystallization
Grain refinement
Advisors
McNelley, Terry R.
Date of Issue
1984-03
Date
March 1984
Publisher
Monterey, California. Naval Postgraduate School
Language
en_US
Abstract
The elevated temperature deformation characteristics of two thermomechanically processed high magnesium, aluminum-magnesium alloys were investigated. the thermomechanical processing itself included warm rolling at 300 degrees C to 94% reduction. Subsequent treatements included anealling after rolling for either one-half hour or ten hours at 300 degrees C, or one-half hour at 440 degrees C. These annealing treatments resuted in varying degrees of recrystallization and grain growth and facilitated examination of the effect of grain size on the superplastic deformation characteristics of these alloys. Tension testing was conducted at strain rates ranging from 5.3x10(-5) to 5.3/10(-2) s-1 and temperatures varying from ambient to 300 degrees C. Materials in the warm rolled condition exhibited the highest strength at ambient temperature and were generally most superplastic at elevated temperature. An al-10%mg-0.5%Mn alloy exhibited elongation of approximately 400% at 300 degrees C.
Type
Thesis
Description
Series/Report No
Department
Organization
Naval Postgraduate School (U.S.)
Identifiers
NPS Report Number
Sponsors
Funder
Format
Citation
Distribution Statement
Approved for public release; distribution is unlimited.
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.