Processing of Aluminum alloy 2090 for superplasticity

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Authors
Groh, Gary E.
Subjects
Aluminum-Copper-Lithium Alloys 2090
Thermomechanically processing
Superplasticity
Advisors
McNelley, Terry R.
Hales, S. J.
Date of Issue
1988-09
Date
September 1988
Publisher
Language
en_US
Abstract
Existing superplastic forming techniques for Al alloys rely on deformation at temperatures of 500°C to achieve the desired ductilities . The Al alloy 2090 (Al-Li-Cu- Zr) has been successfully fabricated by such techniques, but at temperatures where cavitation during forming may significantly reduce the mechanical properties of the final product. It has been previously shown that cavitation can be effectively suppressed by forming at lower temperatures. The purpose of this research is to investigate the applicability of thermomechanical processing methods (developed at NPS for Al­ Mg-X alloys) to produce a refined microstructure capable of supporting superplasticity at lower temperatures in Al 2090.
Type
Thesis
Description
Series/Report No
Department
Mechanical Engineering
Organization
Naval Postgraduate School (U.S.)
Identifiers
NPS Report Number
Sponsors
Funder
Format
70 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.
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