Deformation mechanism maps and microstructural influences

Areas on these maps define ranges of homologous temperature and of applied stress divided by an elastic modulus over which specific mechanisms of deformation are predominant. Langdon has extended their use to illustrate important features. Lines separating the mechanisms of overall sliding from diffusional drift can be difficult to locate. Observations of microstructural features assist in this location and provide information on the way in which the line positions can be influenced. Notably, the flux patterns of diffusional drift are dependent upon stress system as well as on microstructure and it is shown that specimen geometry may also be important.