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Effect of hot extrusion on wear properties of Al-15wt.% Mg2Si in situ metal matrix composites

Soltani, N ; Sharif University of Technology

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  1. Type of Document: Article
  2. DOI: 10.1016/j.matdes.2013.07.084
  3. Abstract:
  4. Al-15wt.% Mg2Si composites were prepared by in situ casting and characterized in wear tests. Previous to the extrusion of specimens at 470°C - varying extrusion ratio (7.4, 14.1 and 25), the as-cast composites were homogenized at 500°C for 5h, followed by slow furnace cooling. The microstructure, hardness and sliding wear behavior were characterized for both, the as-cast and hot extruded composites. Results show that increasing the extrusion ratio causes a significant improvement in hardness and wear resistance. This is ascribed to the observed decrease in average size and better distribution of Mg2Si particles, in tandem with a remarkable decrease in porosity percentages, which goes from 5.63 in the as-cast condition, to 0.47 at the extrusion ratio of 25. It was found that abrasion is the dominant wear mechanism in all extruded composites, whilst a combination of adhesion and delamination appears to be the governing mechanism for as-cast composites
  5. Keywords:
  6. Aluminum composite ; Hot extrusion ; Hardness measurement ; Wear
  7. Source: Materials and Design ; Volume 53 , January 2014 , Pages 774-781
  8. URL: http://www.sciencedirect.com/science/article/pii/S0261306913007127