In this study, the effect of gas pressure on the shape and size of the AZ91 alloy powder produced by using the gas atomization
method was investigated experimentally. Experiments were carried out at 820°C constant temperature in 2-mm nozzle diameter
and by applying 4 different gas pressures (0.5, 1.5, 2.5 and 3.5 MPa). Argon gas was used to atomize the melt. Scanning electron
microscope (SEM) to determine the shape of produced AZ91 powders, XRD, XRF and SEM-EDX analysis to determine the phases
forming in the internal structures of the produced powders and the percentages of these phases and a laser measuring device for
powder size analysis were used. Hardness tests were carried out to determine the mechanical properties of the produced powders.
The general appearances of AZ91 alloy powders produced had general appearances of ligament, acicular, droplet, flake and spherical
shape, but depending on the increase in gas pressure, the shape of the powders is seen to change mostly towards flake and
spherical. It is determined that the finest powder was obtained at 820°C with 2 mm nozzle diameter at 3.5 MPa gas pressure and
the powders had complex shapes in general.
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