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The effects of internal strain on the microhardness of nanocrystalline metals were investigated using an Al 93 Fe 3 Ti 2 Cr 2 alloy prepared via mechanical alloying. The results clearly indicate that the hardness of the nanocrystalline Al alloy decreases with decreasing the internal strain at a given grain size, even though dislocation activity within the grain interior...
The investigation of the compressive behavior of an extruded nanocrystalline Al-Fe-Cr-Ti alloy reveals that the ductility of the alloy is determined by the status of the oxide film at the prior powder particle boundaries. When properly extruded, the alloy exhibits more than -0.45 compressive strain at 25 o C coupled with superior specific strengths up to 400 o C. The enhanced strength...
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