Die wear during hot extrusion of ex-situ and in-situ aluminum composites (Letter to the Editor)

Abstract

The study demonstrates a high-temperature wear of extrusion die during hot pressing of in-situ and ex-situ Al metal matrix composites (MMC). The in-situ Al-10.5vol.%AlN and ex-situ Al-10.5vol.%SiC with high Young's modulus are fabricated by powder metallurgy approach. The composite microstructure and the mechanical properties are characterized. Die wear during hot extrusion of MMC is quantified by the increase of radius of a worn edge as a function of the distance of extruded bars. In-situ Al-AlN exhibited a significantly lower abrasive effect in addition to higher mechanical properties compared to ex-situ Al-SiC. K e y w o r d s : aluminum, composite materials, extrusion, powder technology, wear