Structure and Flow of Amorphous Alloys.
HARVARD UNIV CAMBRIDGE MA DIV OF APPLIED SCIENCES
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This paper, if it is to stay within reasonable limits, cannot possibly be as general as the title indicates. Therefore, rather than trying to cover all the recent developments in the study of structure and flow, an attempt will be made to provide a link between the two subjects the emphasis will be on those structural aspects that are important for flow and on a description of the flow process that is as consistent as possible with the structural findings. In a first section, recent developments in the study of the structure of amorphous alloys are reviewed. The discussion is limited to the transition metal-metalloid glasses, mainly because they are the oldest and best studied group. In amorphous systems as well as in crystals, atomic transport is governed by structural imperfections. As discussed in the second section, defects in amorphous metals are probably more diffuse than in crystals and can therefore best be described as individual sites with small perturbations of the local short range order. In the third section this is applied to problems of steady state plastic flow. First, the experiments are reviewed by means of an empirical deformation mechanism map. Then, an attempt is made to describe the basic processes, homogeneous and inhomogeneous flow.
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