The Effect of Milling Time on the Mechanical Properties of ZA27/Al2O3 Nanocomposites

In this study, ZA27/Al2O3 nanocomposites reinforced with 1 vol.% Al2O3 nanoparticles were produced using mechanical milling and hot pressing method. The milling time was changed between 1h to 8h. The hot pressing prose was performed in vacuum at 432℃ and pressure of 600 MPa. The effect of milling time on the density, hardness and tensile strength of the ZA27/Al2O3 nanocomposites were investigated. The results show that the increase in milling time resulted as a decrease in the density of nanocomposite due to the change in hardness of that. It was observed that the tensile strength of the nanocomposites reached their maximum value (163 MPa) at milling time of 2h and then decreased linearly with increasing milling time. Moreover, the hardness of the nanocomposite milled for 8h was obtained as 155 HB which is about 9 % higher than the hardness of nanocomposite milled for 1h. A linearly increase was also observed the hardness of nanocomposites.