Accession Number:

ADP005936

Title:

Current Status of the Application of Conventional Aluminum-Lithium Alloys and the Potential for Future Developments,

Descriptive Note:

Corporate Author:

ROYAL AEROSPACE ESTABLISHMENT FARNBOROUGH (UNITED KINGDOM)

Personal Author(s):

Report Date:

1989-08-01

Pagination or Media Count:

9.0

Abstract:

Commercial Aluminium-Lithium alloys are now entering service use and, whilst it cannot be claimed that they are yet fully achieving their maximum potential, it is now appropriate to consider the limitations to their further development and the possibilities for the development of other systems and composites based on light alloys, especially suited for aerospace structures. All the commercial Aluminium-Lithium alloys presently offered have been designed to present a reduction in density and an increase in elastic modulus as their main benefits to the designers contemplating their application. The other important metallurgical properties of the alloys, such as strength and fracture toughness, have been matched to the performance of existing 2000 and 7000 series alloys. This paper considers the possibilities for further density reductions and increases in mechanical properties, comparing the potential improvements with those offered by non-metallic composites. Three types of structure are considered generically namely damage tolerant structure, typified by a pressurised fuselage skin, structure limited by inadequate material stiffness in either the case of aeroelastic performance or resistance to buckling and structure limited by currently obtainable strength levels at both ambient and elevated temperatures. Keywords Alloys, Great Britain, Mechanical properties, Metallurgy. JG

Subject Categories:

  • Properties of Metals and Alloys

Distribution Statement:

APPROVED FOR PUBLIC RELEASE