Deformation and failure of a superplastic AA5083 aluminum material with a Cu addition
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Authors
Green, W. Paul
Kulas, Mary-Anne
Niazi, Amanda
Oh-Ishi, Keiichiro
Taleff, Eric M.
Krajewski, Paul E.
McNelley, Terry R.
Subjects
Advisors
Date of Issue
2006-09
Date
Publisher
Elsevier
Language
Abstract
A modified AA5083 aluminum sheet material containing a Cu addition of 0.61 wt pct has been
investigated under conditions relevant to commercial hot-forming technologies. This material was
produced by continuous casting followed by industrial hot and cold rolling into sheet. Deformation
and failure mechanisms at elevated temperatures were investigated through mechanical testing,
thermal analysis, and microscopy. The effects of Cu addition are evaluated by comparisons with data
from AA5083 sheet materials without Cu addition, produced both by continuous and direct-chill (DC)
casting techniques. At low temperatures and fast strain rates, for which solute-drag (SD) creep
governs deformation, the Cu addition slightly increases tensile ductility at 450 °C but does not
otherwise alter deformation behaviors. At high temperatures and slow strain rates, for which grain-
boundary-sliding (GBS) creep governs deformation, the Cu addition decreases flow stress and, at 450
°C, improves tensile ductility. A strong temperature dependence for tensile ductility results from
the Cu addition; tensile ductility at 500 °C is notably reduced from that at 450 °C. The Cu
addition creates platelike particles at grain boundaries, which produce incipient melting and the
observed mechanical behavior.
Type
Article
Description
Series/Report No
Department
Mechanical Engineering
Organization
Naval Postgraduate School (U.S.)
Identifiers
NPS Report Number
Sponsors
Funder
Format
12 p.
Citation
W.P. Green, M.-A. Kulas, A. Niazi, K. Oh-Ishi, E.M. Taleff, P.E. Krajewski, T.R. McNelley, "Deformation and failure of a superplastic AA5083 aluminum material with a Cu addition," Metallurgical and Materials Transactions A, v. 37A, (September 2006), pp. 2727-2738.
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.