Accession Number : ADA194677

Title :   An Investigation into the Metallurgical Aspects of Joining Rapidly-Solidified Aluminum Alloys.

Descriptive Note : Final rept. Sep 84-Dec 87,

Corporate Author : OHIO STATE UNIV RESEARCH FOUNDATION COLUMBUS

Personal Author(s) : Baeslack, William A , III

PDF Url : ADA194677

Report Date : 01 Apr 1988

Pagination or Media Count : 108

Abstract : Research performed during this program demonstrated that the metastable microstructures upon which rapidly-solidified, powder metallurgy (RS/PM) aluminum alloys depend for their unique mechanical properties can be both 'recreated' using rapid solidification fusion welding processes and/or 'retained' using solid-state welding processes. Alloys investigated included Al-Fe-X dispersoid-type compositions developed for superior elevated-temperature properties and Al-Li-X alloys developed for high strength and modulus and low density. Processes found to be most effective for the joining of these alloys included rapid-solidification electron beam and capacitor-discharge welding and solid-state inertia-friction and diffusion welding. Metallurgical phenomena investigated included solidification, solid-state phase transformations, defect formation and structure-property-fracture relationships. RS/PM aluminum alloys which contain low hydrogen levels, such as the inertly produced Al-8Fe-2Mo alloy, were effectively joined using the high-energy density electron-beam welding. Keywords: Iron, Lithium, Molybdenum, Cerium.

Descriptors :   *ALUMINUM ALLOYS, *WELDING, CERIUM, DENSITY, DIFFUSION BONDING, ELECTRON BEAM WELDING, HIGH ENERGY, HIGH STRENGTH, HYDROGEN, IRON, LITHIUM, LOW DENSITY, LOW LEVEL, MECHANICAL PROPERTIES, METALLURGY, METASTABLE STATE, MICROSTRUCTURE, MOLYBDENUM, PHASE TRANSFORMATIONS, POWDER METALLURGY, SOLIDIFICATION, JOINING

Subject Categories : Fabrication Metallurgy

Distribution Statement : APPROVED FOR PUBLIC RELEASE