SYMPOSIA PAPER Published: 01 January 1986
STP33032S

Ultralow-Density, High-Modulus, and High-Strength RSP Al-Li-Be Alloys

Source

Aluminum-lithium-beryllium alloys have been prepared by melt spinning, using prealloyed arc-melted buttons. The alloy ribbon was comminuted and cold compacted to 30 to 50% density, vacuum hot pressed to 100% density, and extruded. The bar product was subsequently solution heat treated, quenched, and aged. The microstructure of the alloys consists of a relatively featureless matrix containing a homogeneous dispersion of fine beryllium particles, mostly 50 to 500 nm in size. The results of heat treatment show that the alloys respond to age hardening in a manner similar to that of binary Al-Li alloys. Preliminary results on the mechanical properties and their relationships with microstructural features are presented for the Al-Li-Be alloys, as well as their potential for weight savings. The authors estimate that these monolithic aluminum alloys may exhibit specific strength and elastic modulus values comparable to those of the best whisker or particulate metal-matrix composites, while showing concomitant high weight savings.

Author Information

Vidoz, AE
Metallurgy Laboratory, Lockheed Palo Alto Research Laboratory, Palo Alto, CA
Crooks, DD
Metallurgy Laboratory, Lockheed Palo Alto Research Laboratory, Palo Alto, CA
Lewis, RE
Metallurgy Laboratory, Lockheed Palo Alto Research Laboratory, Palo Alto, CA
Palmer, IG
Alcan International Ltd., Banbury Laboratories, Banbury, Oxon., England
Wadsworth, J
Metallurgy Laboratory, Lockheed Palo Alto Research Laboratory, Palo Alto, CA
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Details
Developed by Committee: B09
Pages: 237–251
DOI: 10.1520/STP33032S
ISBN-EB: 978-0-8031-4961-8
ISBN-13: 978-0-8031-0442-6