Transformational plasticity associated with the monoclinic‐to‐cubic phase transition at 730°C in Bi 2 O 3 was observed and characterized. This phenomenon is explained in terms of Greenwood and Johnson's model of internal stress‐induced deformation, proceeding, in this instance, by a time‐dependent, grain‐size‐sensitive creep mechanism, probably grain‐boundary sliding. Criteria are proposed for choosing other prospective transformationally plastic ceramics; they are met by Bi 2 WO 6 , which also exhibits extensive transformation plasticity.
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Johnson et al. (1975) studied this question.
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