Abstract: Microstructure and mechanical properties of ball-milled Al-8 wt pct Ni ribbon have been investigated by X-ray diffraction (XRD) and continuous Vickers hardness test, respectively. The results indicate that, the main phases of this alloy are α-Al and orthorhombic-Al3Ni. The lattice parameter of α-Al increases with increasing milling time. From the elastic constant of Al, the average contrast factors of the (111), (200), (220), (311) and (222) Bragg0s reflections for pure edge and pure screw dislocations in fcc crystals with a/2<110>{111} slip system were calculated. The average grain size and dislocation parameters as a function of milling time have been investigated using the modified Williamson-Hall plot and the Warren-Averbach equation, respectively. An attempt has been made to correlate the micro-hardness of milled ribbon with their grain size through the Hall-Patch relationship: HV0:01 = 742.45 < D >-1/2 +401.55 (kg/mm2).

Key words: Aluminum, Microstructure, Property, X-ray diffraction