Abstract
The natures of a plasticity drop and superplasticity, which are usually studied separately, are analyzed. Both anomalies are shown to occur often at the temperatures of first- and second-order phase transformations in metals. These transformations in iron and steels bring metal atoms into an activated state. In materials free of embrittling impurities, this state initiates superplasticity or its elements; in the presence of impurities (oxygen, hydrogen), this state enhances the interaction between impurity and iron atoms and, thus, causes a plasticity drop.
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