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 precipitates. Tensile tests were performed at room temperature, at 77 K and at high temperature. The microstructure is described in terms of precipitation and dislocation structure. Samples deformed at different temperatures were observed. The behavior of alloys of this type is discussed, introducing the effect of an internal stress. Special attention is devoted to the ductility dip frequently observed in such alloys.