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

Conference · Thu Jun 01 04:00:00 EDT 1989

OSTI ID:5684541

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

---

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 Lab., CA (USA)
• Sponsoring Organization: DOE/ER
• DOE Contract Number: AC03-76SF00098
• OSTI ID: 5684541
• Report Number(s): LBL-27381; CONF-890701--13; ON: DE90002120
• Country of Publication: United States
• Language: English

Related Subjects

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