Joseph R. Pickens

TL;DR: In this article, the effect of prior stretching on the identity of strengthening phases in various aging conditions was examined, and the results showed that overaging of the stretched material produced streaks and spots of lower intensity than in the unstretched material.

TL;DR: A literature survey of aluminium powder metallurgy (PM) for high-strength applications was undertaken in this article, with particular emphasis on high strength, corrosion-resistant alloys and alloys developed for use at elevated temperatures.

TL;DR: Aluminum-base alloys containing Cu, Li, Zn, Mg and Ag are disclosed which possess highly desirable properties, such as relatively low density, high modulus, high strength/ductility combinations, strong natural aging response with and without prior cold work, and high artificially aged strength.

TL;DR: In this paper, the structure and properties of the strengthening phases formed during aging in an Al-Cu-Li-Ag-Mg alloy (Weldalite 049) were elulcidated, by following the development of the microstructure by means of TEM.

TL;DR: A family of alloys based upon aluminum-copper-magnesium-silver alloys to which lithium has been added, within specified ranges, exhibits superior ambient- and elevated-temperature strength, superior ductility at ambient and elevated temperatures, extrudability, forgeability, weldability, and an unexpected natural aging response as discussed by the authors.