Synthesis of nanocrystalline phase by mechanical alloying of Mixed Al-(Fe, Cr, Ti) powder and its consolidation

Abstract

The powder of chromium, iron and titanium were mixed with aluminum powder 5and/or 10mol%each. MA (mechanical alloying) has carried out for those powders in the region of milling time of 1.8-216ks. Obtained powder were studied by the methods of X-ray diffraction, Vickers hardness measurement and differential scanning calorimeter. As a result, it can be understood that chromium is solid-soluted in alunium phase by MA for 72ks. Inaddition, the crystalline size of α-Al phase decreases while hardness is increases as milling time increases. That relationship between crystalline size and hardness satisfies the Hall-Petch relation. Furthermore, Al-Fe and Al-Ti alloys has shown a similar tendency, as well.