Garroni, Sebastiano (2012) Deformation conditions for Ni powders undergoing mechanical processing. Journal of Physics and Chemistry of Solids, Vol. 73 (6), p. 770-776. eISSN 1879-2553. Article.
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Ni powders were submitted to mechanical processing by ball milling. The microstructural refinement of the processed powders was followed by X-ray diffraction by evaluating the average crystallite size and the average strain content. The Vickers micro-hardness was also measured. The experimental evidences were rationalized using a phenomenological model, which allowed to estimate the amount of powder processed at individual collisions. The density of dislocations was also estimated and correlated with the experimental Vickers micro-hardness values. The connection between the work- and gain-hardening mechanisms described by the Bailey–Hirsch and Hall–Petch relationships is discussed.
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