The Influence of Extrusion-Consolidation Variables on the Integrity and Strength of the Product from Pre-Alloyed 7075Aluminum Powder.

摘要

Hot extrusion-consolidation of spherical 7075aluminum alloy powders can be accomplished for maximum integrity and tensile properties by extrusion in the temperature range 700F to 800F and extrusion ratios of 6:1to 10:1. Spherical 7075aluminum alloy metal powder processing and product properties are either to or,in some cases,equal to those of wrought materials processed under the same conditions. The inferior behavior of the 7075metal powder during processing and tensile testing is attributable to the presence of an oxide film on the surface of the powder particles. The imposition of compressive stresses alone,even if sufficient to achieve complete densification,does not permit welding of adjacent particles. For this welding to occur,shearing of adjacent particles is required in order to break up the oxide film.