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http://dx.doi.org/10.4150/KPMI.2008.15.2.142

Fabrication and Properties of High Strength Hypereutectic AI-Si Powders by a Gas Atomization Process II. Extrusion and Mechanical Properties  

Kim, Yong-Jin (Department of Powder Materials Research, Korea Institute of Materials Science)
Kim, Jin-Chun (School of Materials Science and Engineering, University of Ulsan)
Publication Information
Journal of Powder Materials / v.15, no.2, 2008 , pp. 142-147 More about this Journal
Abstract
The hypereutectic Al-20 wt%Si powders including some amount of Cu, Fe, Mg, Mn were prepared by a gas atomization process. In order to get highly densified Al-Si bulk specimens, the as-atomized and sieved powders were extruded at $500^{\circ}C$, Microstructure and tensile properties of the extruded Al-Si alloys were investigated in this study. Relative density of the extruded samples was over 98%. Ultimate tensile strength (UTS) in stress-strain curves of the extruded powders increased after T6 heat treatments. Elongation of the samples was also increased from 1.4% to 3.2%. The fracture surfaces of the tested pieces showed a fine microstructure and the average grain size was about $1{\mu}m$.
Keywords
Hypereutectic Al-Si alloy; Gas atomization; Hot extrusion; Tensile properties;
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
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