Powder metallurgical processing of a SiC particle reinforced Al-6wt.%Fe alloy

Abstract

Discontinuously reinforced aluminum alloys for elevated temperatures with a matrix hardened by intermetallic phases generally have to be produced by powder metallurgy because of their high content of alloying elements. The objective of this investigation was the evaluation of powder metallurgical processing for an A16Fe powder alloy containing various fractions and volume contents of Sic particles. During processing, the effect of powder mixing on S i c particle distribution in the extruded product was emphasized and examined by scanning and transmission electron microscopy. Gas development during mixing and degassing was investigated by mass spectroscopy and related to strength, fracture toughness and ductility. In addition to room temperature mechanical properties, elevated temperature tensile properties were evaluated for the various Sic particle distributions.

Effect of the heat treatment prior to extrusion on the direct hot-extrusion of aluminium powder compacts

“…On top of this hydrated oxide, there is an additional layer of physically adsorbed water and oxygen molecules. The hydration molecules and adsorbed molecules can be eliminated by a degassing heat treatment [26], i.e. by heating up the sample usually under vacuum [3,[27][28][29], but also under hydrogen [30] or argon [4].…”

The influence of sintering temperature and silicon carbide percent on the compression properties

“…Powder metallurgical processing has been applied to reinforce ductile metal ( aluminum ) powder with high strength high modulus refractory (Sic) particles, with this addition, produces a material whose mechanical properties are intermediate between the Matrix alloy and the ceramic reinforcement [2]. The ceramic particle additions make it possible to increase the specific elastic modulus of aluminum and improve aluminum thermal properties as well as improve another mechanical properties [3].…”