Abstract
The paper describes the development of elementary fracture mechanism maps. These are maps with stress as one axis and homologous temperatures as the other, showing fields of dominance of a given micromechanism of fracture: cleavage, ductile fracture, rupture, inter crystalline creep fracture, and so on. Superimposed on the fields are contours of constant time-to-fracture, or strain-to-fracture. The maps are more difficult to make, and less reliable, than deformation-mechanism maps [1]; and one map describes only one stress state (simple tension, torsion, plane strain compression, and so on). Nevertheless, they give an overview of the micromechanisms by which a given material may fail, and help identify the one most likely to be dominant in a given experiment, or an engineering application. They should give guidance in selecting materials for high temperature use, and in the extrapolation of creep-rupture data.
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