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Cryogenic mechanical properties of low density superplastically formable Al-Li alloysThe aerospace industry is considering the use of low density, superplastically formable (SPF) materials, such as Al-Li alloys in cryogenic tankage. SPF modifications of alloys 8090, 2090, and 2090+In were tested for strength and Kahn tear toughness. The results were compared to those of similar tests of 2219-T87, an alloy currently used in cryogenic tankage, and 2090-T81, a recently studied Al-Li alloy with exceptional cryogenic properties (1-9). With decreasing temperature, all materials showed an increase in strength, while most materials showed an increase in elongation and decrease in Kahn toughness. The indium addition to 2090 increased alloy strength, but did not improve the strength-toughness combination. The fracture mode was predominantly intergranular along small, recrystallized grains, with some transgranular fracture, some ductile rupture, and some delamination on large, unrecrystallized grains.
Document ID
19910059283
Document Type
Conference Paper
Authors
Verzasconi, S. L. (California Univ. Berkeley. Lawrence Berkeley Lab, CA, United States)
Morris, J. W., Jr. (Lawrence Berkeley Laboratory; California, University Berkeley, United States)
Date Acquired
August 15, 2013
Publication Date
January 1, 1989
Subject Category
METALLIC MATERIALS
Meeting Information
International Aluminum-Lithium Conference(Williamsburg, VA)
Funding Number(s)
CONTRACT_GRANT: DE-AC03-76SF-00098
Distribution Limits
Public
Copyright
Other