Several recent investigations have described thecreep behavior of metal matrix composites at elevatedtemperatures and this has led to significant advances inunderstanding the properties of these materials and thedeformation processes occurring in high temperature flow. Thispaper examines these recent developments with specialreference to the nature and significance of the threshold stresses.It is demonstrated that the rate-controlling mechanisms in thesematerials divide, as in solid solution alloys, into the distinctprocesses of dislocation climb and viscous glide representingclass M and class A behavior, respectively.
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