Yield stress of PM Al-10 wt.% SiC composite after extrusion and drawing
Stefan Szczepanik, Piotr Nikiel
Quarterly No. 3, 2013 pages 160-164
DOI:
keywords: composites with an aluminium matrix, silicon carbide particles, extrusion, drawing, reinforcing, mechanical properties
abstract The yield and flow stress data for an Al-10% SiC composite and for its aluminium PM matrix after extrusion and drawing are reported. Preforms were manufactured by the cold pressing of RAl-1 aluminium powder and of its mixture with 10% SiC particles. They were extruded at 480ºC, with extrusion ratio = 4.2. No porosity was observed on longitudinal sections of the Al-SiC composite. The hardness and compressive mechanical properties of the materials were evaluated. The yield and compression strengths of the composite were higher than for the PM aluminium. After cold drawing with strain r = 0.09, the yield stress of the extruded aluminium increases from the range of 74 to 80 MPa to the range of 115 to 118 MPa and at a 0.75 strain flow, the stress increases to 160 MPa. The average yield stress of the extruded composite is 93 MPa and drawing increased it to 135 MPa; at a 0.75 strain flow stress, it increased from 150 to 180 MPa. For both the aluminium and the composite, the critical compressive strains are higher than 0.75.