Cryogenic mechanical properties of low density superplastically formable Al-Li alloys
The 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. 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. 17 refs., 3 figs., 3 tabs.
- Research Organization:
- Lawrence Berkeley Lab., CA (USA)
- DOE Contract Number:
- AC03-76SF00098
- OSTI ID:
- 6294832
- Report Number(s):
- LBL-26652; CONF-8903109-2; ON: DE89010587
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360102 -- Metals & Alloys-- Structure & Phase Studies
360103* -- Metals & Alloys-- Mechanical Properties
420201 -- Engineering-- Cryogenic Equipment & Devices
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ALLOYS
ALUMINIUM ALLOYS
ALUMINIUM BASE ALLOYS
COPPER ALLOYS
CRACK PROPAGATION
CRYOGENIC STORAGE DEVICES
FAILURES
FRACTURES
INDIUM ADDITIONS
INDIUM ALLOYS
LITHIUM ALLOYS
LOW TEMPERATURE
MATERIALS TESTING
MECHANICAL PROPERTIES
MEMORY DEVICES
TENSILE PROPERTIES
TESTING