Abstract
The structural development with milling time during mechanical alloying (MA) of Al, Ni and Ti powders in the compositions of Al65Ni10Ti25 and Al25Ni50Ti25 was investigated by x-ray diffraction and DSC. The MA powders were sintered by hot press. The phase, microstructure and hardness of the sintered compacts were studied using x-ray diffraction, SEM and vickers hardness tester. An amorphous phase was formed on final alloying stage for both the compositions. The ternary intermetallics of Al6.5NiTi2.5(π) and AlNi2Ti(σ) were confirmed to form on heating the well-milled powders. The optimum MA times for sintering to obtain the chemical homogeniety and enough hardness were found to be longer than 1800ks for Al65Ni10Ti25 and longer than 360ks for Al25Ni50Ti25.
