Effect of 15%Si addition on mechanical properties of rapidly solidified Al-Fe and Al-Mn alloys

Rapidly solidified flakes of six alloys systems (Al-Fe, Al-Mn, Al-Si-Fe, Al-Si-Mn, Al-Si-Fe-Mn and AC8A) were produced by using an apparatus combining atomization and water-cooled single copper roll. Consolidation of the flakes was done by cold pressing, degassing and hot extrusion. Metallography and mechanical properties were studied in order to evaluate the effect of 15mass%Si addition on properties of Al-Fe and Al-Mn base rapidly solidified P/M materials. Tensile strength of Al-Fe P/M materials at room temperature was increased by addition of 15%Si, whereas Al-Mn alloys with 15%Si addition showed almost same strength as those without 15%Si addition. However, elevated temperature tensile strength of the alloys containing 15%Si was lower than that of Al-Fe and Al-Mn binary alloys. P/M material of Al-15%Si-8%Fe alloy showed the highest tensile strength of about 410MPa at room temperature, and Al-8%Fe alloy showed the highest tensile strength of about 140MPa at 573K. Ductility of P/M materials was reduced by addition of 15%Si.