Atomized picoscale composition aluminum alloy and method thereof

摘要

The invention is a process for manufacturing a nano aluminum/alumina metal matrix composite and composition produced therefrom. The process is characterized by providing an aluminum powder having a natural oxide formation layer and an aluminum oxide content between about 0.1 and about 4.5 wt. % and a specific surface area of from about 0.3 and about 5 m2/g, hot working the aluminum powder, and forming a superfine grained matrix aluminum alloy. Simultaneously there is formed in situ a substantially uniform distribution of nano particles of alumina. The alloy has a substantially linear property/temperature profile, such that physical properties such as strength are substantially maintained even at temperatures of 250° C. and above.

主权项

1. A process for manufacturing a nano aluminum composite, comprising the steps of:
a) providing, an aluminum powder having a natural oxide formation layer and an aluminum oxide content between about 0.1 and about 4.5 wt. % and a specific surface area of from about 0.3 and about 5.0 m2/g; b) hot working the aluminum powder at a temperature below the recrystallization temperature of the powder, and forming thereby a superfine grained matrix aluminum alloy; and c) simultaneously with the hot working of step b), redistributing the aluminum powder into uniformly dispersed nano particles of alumina throughout said alloy; wherein said alloy has a substantially linear ultimate tensile strength vs temperature.