Abstract
The present study was carried out to investigate the effect of thermal treatment on the atomic ordering of mechanically alloyed Al 3Nb. The partially disordered Al 3Nb alloy is transformed into an ordered 10-nm sized Al 3Nb after a following heat treatment. The value of Δ H order for ordering of Al 3Nb intermetallics is more negative for faster heating rates and prolonged milling time. The average values of Δ H order correspond to about 35% of the Δ H necessary for Al 3Nb phase formation. The activation energies for ordering of Al 3Nb at 30 and 40 h of milling are relatively close to the isothermal grain growth enthalpy of nanocrystalline Al 3Nb intermetallics.
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