Effects of extrusion temperature on creep properties of spray-formed and wet-extruded Al-8.3 mass % Fe alloys

Al-8.3 mass%Fe alloys with fine grain sizes and finely dispersed Al3Fe part icles were fabricated by a spray-forming method and successive extrusion at three different temperatures, 573, 673 and 773 K. Size, morphology and dis tribution of Al3Fe particles, and the matrix grain structure were independe nt of the extrusion temperature. Tensile properties at RT were also indepen dent of the extrusion temperature, however, the increase of extrusion tempe rature brought about increased flow stress at 573 K in tensile tests. The h igher extrusion temperature resulted in lower creep rates, and the minimum creep rate of the specimen extruded at 773 K was one tenth of that extruded at 573 K. The strain dip tests revealed that the 773 K extruded specimens have a larger internal stress than the 573 K ones.