| Abstract |
| The microstructure and mechanical properties of the gas atomized and extruded Al-20Si-5Fe-2x (x=Cr, Zr or Ni) alloys were evaluated. The alloy powder was degassed under different vacuum levels in advance of the extrusion. It was shown that the addition of a quaternary element resulted in the formation of very fine particles that contributed to the improved mechanical properties of the alloys, especially at elevated temperatures. Of these additions, nickel was found to be the most effective in increasing the UTS of the alloy both at room and elevated temperatures. Degassing the rapidly solidified powders under better vacuum improved the properties further. |
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| Key Words |
| Rapid solidification , Hypereutectic Al-Si alloy , Transmission electron microscopy ( TEM ) , Tensile strength , Thermal expansion coefficient , Degassing , Extrusion |
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