Thermally Activated Flow and Strain Rate History Effects for Some Polycrystalline FCC Metals
BROWN UNIV PROVIDENCE RI DIV OF ENGINEERING
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It is shown in the paper that the strain rate history effects play a very important role in the plastic behavior of polycrystalline fcc metals. These effects are attributed to some differences in the effective dislocation multiplication rates at different strain rates. A mathematical description of the effects discussed is possible by a coupling of two relationships. One of these is the relation resulting from the thermally activated process which is dominating at a certain level of strain, while the second is of an evolutionary type. An evolutionary relationship describes the changes in structure during the course of plastic deformation. A few examples of an evolutionary relationship along with a thermally activated intersection model are discussed.
- Metallurgy and Metallography
- Solid State Physics