The effect of thermomechanical processing variables on ductility of a high-Mg, Al-Mg-Zr alloy.
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Authors
Grider, William H.,Jr.
Subjects
Superplasticity
Ductility
Aluminum-Magnesium Alloys
Thermomechanical Processing
Ductility
Aluminum-Magnesium Alloys
Thermomechanical Processing
Advisors
McNelley, T.R.
Date of Issue
1986
Date
June 1986
Publisher
Language
en_US
Abstract
In previous research on thermomechanically processed high - Mg,
\1 - Mg alloys, yield strengths of 276 MPa (40 ksi) were retained after
simulated superplastic forming, but ductility at ambient temperature
varied from one to fourteen percent elongation in tension testing. This
variability in ductility was studied in a series of experiments conducted
jn an Al-10%Mg-0 . l%Zr alloy. Study by light microscopy and scanning
Electron microscopy revealed defects resulting from inverse segregation
in the original casting and also defects resulting from the relatively
light reductions utilized in the warm rolling of the material. The use
of heavier reductions in rolling was shown to improve tensile ductility
at ambient temperature both in the as-rolled and annealed conditions
Superplasticity in material processed using such heavier reductions in
rolling was then studied by tension testing at 300° C.
Type
Thesis
Description
Series/Report No
Department
Mechanical Engineering
Organization
Identifiers
NPS Report Number
Sponsors
Funding
Format
77 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.