Enhancement of superplastic formability in a high strength aluminum alloyA 7475 aluminum alloy was developed for superplastic forming (SPF). By lowering the Fe and Si contents in this alloy significantly below their normal levels and optimizing the thermomechanical processing to produce sheet, over 2000 percent thickness strain to failure was obtained. The microstructure, elevated-temperature uniaxial and biaxial tension, and cavitation behavior of the alloy were determined. In addition, a constitutive model was used to form a generic structural shape from which mechanical test specimens were removed and post-SPF characteristics were evaluated. The constitutive model included both material strain hardening and strain rate hardening effects, and was verified by accurately predicting forming cycles which resulted in successful component forming. Stress-life fatigue, stress rupture, and room and elevated temperature tensile tests were conducted on the formed material.
Document ID
19890058588
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Agrawal, S. P. (Northrop Corp. Hawthorne, CA, United States)
Turk, G. R. (Northrop Corp. Hawthorne, CA, United States)
Vastava, R. (Northrop Corp. Aircraft Div., Hawthorne, CA, United States)
Date Acquired
August 14, 2013
Publication Date
January 1, 1988
Subject Category
Metallic Materials
Meeting Information
Meeting: International SAMPE Metals and Metals Processing Conference