LXV. An electron-microscope study of the effect of temperature and strain-rate on the mechanism of deformation of aluminium

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Abstract
Formvar and oxide replicas have been prepared from polycrystalline specimens deformed plastically over a range of temperatures and rates of strain. Electron microscope observations support the view, put forward previously by Wood, Wilms and Rachinger (1951), that there are three basic stages in the mechanism of the deformation of metals, which have been termed the slip, cell and boundary micro-flow processes. If the temperature and rate of strain are adjusted suitably, no sign of slip is visible in the cell stage even with the high resolution available with electron microscopy. Correspondingly, in the boundary micro-flow stage, there is no evidence of any internal breakdown or disorientation of the grains. In both the cell and boundary micro-flow stages however, considerable activity occurs at the grain boundary zones, which exhibit markings similar in appearance to slip but always approximately parallel to the boundary direction. Whilst the present paper is confined in the main to experimental observations, their interpretation in terms of structural changes and their possible relationship to the dislocation theory of deformation are discussed briefly.

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