Study and methods of analysis of mechanically alloyed Cu-Mo powders

The results show that the grain size and particle size of powders decrease with increasing milling time. Grain size in samples with 8 at.% Mo approached a minimum value of 20 nm after 50 h, and in samples with 1 at.% Mo, 30 nm after 75 h of milling. Nanohardness shows a maximum about 4 GPa for the alloy with 8 at.% of Mo and 100 h of milling. The measured crystallite size by TEM is in good agreement with the value calculated by XRD. Thermal analyses (DSC) showed the temperature intervals where the dynamic recrystallization would take place. According to these results this phenomenon would happen near 350 °C.