Abstract
The occurrence of plastic flow during sintering is no acknowledged in the classical theory of sintering densification. However, study of sintered α-Al 2O 3 by transmission electron microscopy showed that significant plastic flow occurred during the sintering of the material. It is concluded that evidence of similar plastic flow in the sintering of fine ceramic powders is probably destroyed by the practice of prolonged firing at high temperatures. Dislocations activated by neck ‘capillarity’ stress can aid densification by a glide-climb mechanism.
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