Cryogenic mechanical properties of low density superplastic Al-Mg-Sc alloys

Conference · Thu Jun 01 00:00:00 EDT 1989

OSTI ID:5684541

Verzasconi, S. L.; Morris, Jr., J. W. ^[1]

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1. Lawrence Berkeley Lab., CA (USA)

Spacecraft cryogenic fuel tankage made from superplastic materials is a possible new application for low density aluminum alloys such as Al-Mg-Sc. Examples from this alloy system were examined for cryogenic strength and toughness. Alloys studied were received in the superplastically formable condition, in sheet form. Alloy 2219-T87 sheet was also tested for comparison, since 2219-T8X is currently used in cryogenic tankage. Five compositions of Al-Mg-Sc alloys were tested at 77 and 4 K. Alloys showed the expected increase in strength with decreasing temperature, accompanied by a general slight decrease in elongation and the Kahn tear-yield ratio toughness indicator; however, the strength-tear toughness relationship of this alloy class was as good as or better than that of 2219-T87. Correlations found between the properties, microstructure, and fracture surfaces are discussed. 8 refs., 1 fig., 3 tabs.

• Research Organization: Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
• Sponsoring Organization: DOE/ER
• DOE Contract Number: AC03-76SF00098
• OSTI ID: 5684541
• Report Number(s): LBL-27381; CONF-890701-13; ON: DE90002120
• Resource Relation: Conference: International cryogenic materials conference, Los Angeles, CA (USA), 24-28 Jul 1989
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM BASE ALLOYS
MECHANICAL PROPERTIES
MAGNESIUM ALLOYS
FRACTURES
MICROSTRUCTURE
SCANDIUM ADDITIONS
SPACE VEHICLE COMPONENTS
TANKS
TENSILE PROPERTIES
ULTRALOW TEMPERATURE
ALLOYS
ALUMINIUM ALLOYS
CONTAINERS
CRYSTAL STRUCTURE
FAILURES
SCANDIUM ALLOYS
360103* - Metals & Alloys- Mechanical Properties
360102 - Metals & Alloys- Structure & Phase Studies