Control of superplastic cavitation by hydrostatic pressure

Journal Article · Mon Aug 01 04:00:00 EDT 1983 · Metall. Trans., A; (United States)

DOI:https://doi.org/10.1007/BF02654385· OSTI ID:6794549

Bampton, C C; Ghosh, A K; Hamilton, C H; Mahoney, M W; Raj, R

It has been shown that the application of hydrostatic gas pressures during superplastic deformation of fine grained 7475 Al can prevent the intergranular cavitation normally encountered at atmospheric pressure. A critical ratio of hydrostatic pressure to flow stress may be defined for each superplastic forming condition above which virtually no cavitation occurs. In deformation conditions where intergranular cavitation plays a significant part in final tensile rupture, superplastic ductility may be improved by the application of hydrostatic pressures. Similarly, detrimental effects of large superplastic strains on service properties may be reduced or eliminated by the application of suitable hydrostatic pressures during superplastic forming. In this case, superplastically formed material may have the same design allowables as conventional 7475 Al sheet.

• Research Organization: Rockwell Int. Science Center, Thousand Oaks, CA
• OSTI ID: 6794549
• Journal Information: Metall. Trans., A; (United States), Journal Name: Metall. Trans., A; (United States) Vol. 14A:8; ISSN MTTAB
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360103* -- Metals & Alloys-- Mechanical Properties
ALUMINIUM
ATMOSPHERIC PRESSURE
CAVITATION
DEFORMATION
DESIGN
ELEMENTS
FAILURES
FLOW STRESS
HYDROSTATICS
MECHANICAL PROPERTIES
METALS
PLASTICITY
PRESSURIZING
RUPTURES
SHEETS
STRAINS
STRESSES
TENSILE PROPERTIES