Particle size of Al-10%wt.Ti powders due to the influence of ball diameter have been carried out using mechanical alloying techniques. The milling device used consisted of a Fritsch Pulverisette-5 planetary type ball mill with the rotational speed of about 360 rpm and balls size of 15 and 20 mm. The materials used are stearic acid which was used as a process control agent, aluminum and titanium powders. A mixture of aluminum and titanium powders has the composition of Al-10wt.%Ti. The Al-10wt.%Ti powders, stearic acid and stainless steel balls were added to the Fritsch Pulverisette-5 planetary in the argon gas environment. The weight ratio of stainless steel balls to the Al-10wt.%Ti powder was 20 : 1. The mixing time process was carried out for 2, 5, 10, 15, 20 and 30 hours, respectively. To avoid increasing temperature suddenly, the milling process was rested for 30 minutes every 2.5 hours of milling. XRD, SEM and EDX were used to observe changes in the structure and morphology of the powder during the milling process. The results obtained using XRD showed that the peaks of Ti begin disappear with the increasing of milling time. This phenomenon indicates the forming alloying of Ti atoms in the Al matrix. The results obtained using SEM show that the longer the mixing time, the finer the size of the Al-10% by weight of Ti alloy. The EDX results showed that the powder obtained was Al-Ti binary alloy powder without any impurities.
Keywords: Al-10%wt.Ti powder, mechanical alloying, XRD, SEM, EDX
