A deformation mechanism map is a way of representing the dominant deformation mechanism in a material loaded under a given set of conditions and thereby its likely failure mode. Deformation mechanism maps consist of some kind of stress plotted against some kind of temperature axis, typically stress normalised using the shear modulus versus homologous temperature. For a given set of operating conditions calculations are undergone and experiments performed to determine the predominant mechanism operative for a given material.
Read more about Deformation Mechanism Map: Constructing The Map, Reading The Map, Example: Creep
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