Accession Number : ADD009163

Title :   Preparation of Aluminum Lithium and Aluminum Magnesium Alloys by Rapid Crystallization under High Specific Pressures.

Descriptive Note : Patent Application,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Divecha,Armarnath P ; Dejarnette,Hampton M

Report Date : 22 Dec 1981

Pagination or Media Count : 18

Abstract : This invention relates to alloys and more particularly to aluminum alloys. Modern metallurgy has given rise to thousands of new alloys including stainless steel, Ni base superalloys, titanium and aluminum alloys. While these achievements are noteworthy, it is also true that the specific stiffnesses (defined as elastic modulus, E, divided by the specific gravity or density, D) of all of these alloys are very nearly the same. Thus, the selection of one alloy over any other is based on other considerations such as yield strength, corrosion resistance, formability, weldability, etc. All these properties can be altered or improved by judicious alloying additions while the elastic modulus remains essentially unaffected. The only known alloy system where a substantial gain in specific stiffness is achievable is aluminum-lithium. When alloyed with aluminum, only 3% addition of lithium produces a two-fold advantage.

Descriptors :   *Patent applications, *Aluminum alloys, *Lithium alloys, *Crystallization, Stiffness, High pressure, Magnesium alloys, Density, Specific gravity, Mechanical properties, Yield strength, Inventions, Modulus of elasticity, Corrosion resistance, Physical properties, Additives

Subject Categories : Properties of Metals and Alloys
      Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE