Squeeze Casting Technology in Production of High-Strength Monolithic Aluminum Alloys and Aluminum Matrix Composites

摘要

The paper presents the results of investigation of monolithic and composite aluminum-based cast and materials with wrought alloys: AW 2024, AW 6061, AW 7075 in accordance with EN 573-3 and cast alloys AC 42100 according to EN 1706. Castings were produced using VSC 500 stand at a high squeeze pressure of 150 MPa and, for comparison, by gravity casting into permanent mold. Composite castings were performed using both commercially available ceramic preform (based on Al_2O_3 - Saffil~R fibers) and preforms produced by Institute of Foundry using high energy ball milling and mechanical alloying of ceramic substrates. The preforms are made from shot Saffil~R fibers and colloidal silica (LUDOX~R) with fillers increasing porosity. Castings made of aluminum wrought alloy after heat treatment have shown almost double increased mechanical properties. In research characterized the material properties, including the influence on pressure for microstructure, defined physical properties, namely density, electrical conductivity and thermal conductivity, coefficient of thermal expansion, as well as basic mechanical characteristics.