As the milling time was increased,a reduction tendency of milling,at which the crystallite size appeared to increase slightly
It is evident that the composite with 2 wt% of zro exhibited a smaller average crystallite size compared to 5 wt% of zro
If it is taken also into account that the former sample exhibited a more markedly morphological change in comparison to the latter, it can be stated that 2 wt% sample was subjected to a higher strain during MM.