MECHANICAL-PROPERTIES AND MICROSTRUCTURE OF AL-FE-X ALLOYS

The mechanical behavior and microstructure of aluminum alloys for high temperature applications, prepared by rapid solidification and powder metallurgy techniques, have been observed. These alloys contain high concentrations of transition elements which form thermally stable prec ipitates. Tensile tests were performed at room temperature, at 77 K an d at high temperature. The microstructure is described in terms of pre cipitation and dislocation structure. Samples deformed at different te mperatures were observed. The behavior of alloys of this type is discu ssed, introducing the effect of an internal stress. Special attention is devoted to the ductility dip frequently observed in such alloys.