Abstract
Abstract : Nanostructured Al93Fe3Ti2Cr2 alloys were prepared via mechanical alloying (MA) starting from elemental powders, followed by extrusion to form bulk material. The microstructure and phase formation as a function of the milling time and the concentration of the process-control agent were investigated. The thermal stability of the mechanical alloyed powder was also studied. The bulk material extruded from the mechanical alloyed powder exhibited superior strength with good ductility at both ambient and elevated temperatures under compressive loading conditions. The enhanced strength at both ambient and elevated temperatures was attributed to the retention of ultrafine grains (fcc-Al < 100 nm), the formation of supersaturated solid solutions, and the presence of nanoscale intermetallic precipitates.
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