Thermomechanical processing of aluminum alloy 2519 for grain refinement and superplasticity
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Authors
Bohman, Scott D.
Subjects
Aluminum-copper alloys
Superplasticity
Thermomechanical processing
Superplasticity
Thermomechanical processing
Advisors
McNelley, Terry R.
Kalu, Peter N.
Date of Issue
1992-06
Date
June 1992
Publisher
Monterey, California. Naval Postgraduate School
Language
en_US
Abstract
Thermomechanical processing (TMP) methods developed for Al-MG and Al-Mg-Li alloys have been modified and applied to the commercial 2519 Al-Cu alloy. The TMP included initial overaging and was designed to facilitate particle-stimulated nucleation (PSN) of recrystallization during controlled reheating intervals between successive rolling passes of the process. Effects of TMP variables were evaluated by tensile testing at temperatures ranging from 300-400(o) C. Strain rates varied from 6.7x10(-5) s(-1) to 6.7 x 10(-3)s(-1). Also, microstructural analysis was conducted to determine the effect of the processing on the microstructure. The further evolution of microstructure during superplastic testing of the material was also assessed. Refinement to grain sizes below 10 um by PSM was achieved. Superplastic ductility of 200 pct. was limited by grain growth.
Type
Thesis
Description
Series/Report No
Department
Mechanical Engineering
Organization
Naval Postgraduate School
Identifiers
NPS Report Number
Sponsors
Funder
Format
78 p.
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.