Author： Castro-Fernandez F. R. Sellars C. M. Whiteman J. A.
Publisher： Maney Publishing
ISSN： 1743-2847
Source： Materials Science and Technology, Vol.6, Iss.5, 1990-05, pp. : 453-460
Disclaimer: Any content in publications that violate the sovereignty, the constitution or regulations of the PRC is not accepted or approved by CNPIEC.
Abstract
Plane strain compression tests have been carried out at strain rates between 0·5 and 10 s−1 and temperatures in the range 275–510°C, both under nominally isothermal conditions and with temperature decreasing. Also, temperature or strain rate have been changed in the interval between two deformations. In all cases, the stress–strain curves obeyed a mechanical equation of state, described by constitutive relationships in terms of strain and instantaneous value of Zener–Hollomon parameter Z. When the value of Z varies slowly during deformation, flow stress is uniquely related to subgrain size and to dislocation density within subgrains, but these relationships break down in transition structures developed after a change of Z between two deformations. The existence of an equation of state for mechanical behaviour, but not for microstructure, is considered to result from important contributions of both dislocation velocity and density to hot strength.MST/1066
Related content
Access to resources
Recommend
