Abstract
The dilatometric method was used to study the deformation arising in iron and iron-nickel alloys containing up to 20% nickel upon the α → γ → α transformation cycles at a small compression load. At a constant load, a decrease in the heating rate leads to an increase in the dilatometric effect of the α → γ transformation by a factor of three, from a one third of the volume effect of transformation upon rapid heating to its full value upon slow heating. An inverse effect, i.e., a decrease in the degree of deformation that is developed upon the transformation, is caused by the alloying of iron with nickel. The anomalous plasticity observed upon the polymorphic transformation is related to the fact that the external stresses climinate spatial degeneration and produce a preferred direction for the relization of dimensional changes caused by the volume effect of transformation.
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Original Russian Text © E.I. Estrin, 2006, published in Fizika Metallov i Metallovedenie, 2006, Vol. 102, No. 1, pp. 795–800.