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Inverse Hall–Petch effect/grain size softening in quasi- and nanocrystalline materials at ambient/low temperatures is attributed to mesoscopic (~a grain diameter or more) grain/interphase boundary sliding controlled flow. Equations for estimating the free energy of activation for the rate controlling process, the free volume fraction present in a basic sliding unit and the average number of grain...
Optimal structural superplasticity (defined as the range from the lowest strain rate to the point of inflection on the isostructural, isothermal sigmoidal ln(strain rate)-ln(stress) plot) in both metals and ceramics of grain sizes ranging from a few nanometers to a few micrometers is explained using a model in which rate controlling grain/interphase boundary sliding at the level of atomistics develops...
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