Toward a general description of transformation plasticity in metals and alloys (INVITED)

Abstract eng:
An innovative approach to the modelling of transformation plasticity in metals and alloys is undertaken, considering the sole Greenwood-Johnson mechanism wherein the phenomenon is attributed to microplasticity in the weaker mother phase, arising from differences of specific volume between the two phases. This approach is based on combination of analytical calculations, micromechanical numerical simulations and experiments. This paper is devoted to the analytical part. A model of growth of an ellipsoidal core of daughter phase in an ellipsoidal volume of mother phase, in the absence or presence of some external stress, is developed. The case of a prolate, spheroidal core is envisaged in a first step. The results evidence the influence of the core shape upon the overall deformation of the cell obtained after its complete transformation, in the absence or presence of some external stress.

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