Abstract
Abstract Synthesis of intermetallic compound of Ni 3 Al by ball milling elemental blends of Ni and Al in the proportion of 3:1 has been done with a view to study the mechanism of alloying during ball milling. Systematic study on the kinetics of transformation in the intermediate stages of milling from 1 to 64 h has been contemplated by characterizing the microstructures in terms of various defect-related parameters viz. stacking fault, crystallite size, root mean square (rms) strain, dislocation densities, percentage of different phases formed as a function of milling time. The methodology used is the powerful Rietveld’s whole X-ray profile fitting technique. The results reveal the formation of two phases, solid solution of Ni-Al transforming gradually to Ni 3 Al (disordered). Complete transformation is achieved after 57 h of milling. The second phase forming disordered Ni 3 Al has smaller crystallite size (nano-order), larger rms strain, higher stacking fault and dislocation density compared to those of Ni-Al solid solution. Study of grain structure by transmission electron microscopy (TEM) further corroborates the value of the nano-order crystallite diameters as evaluated from the X-ray study.
Published Version
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