The strain-rate sensitivity of the flow stress for a peierls mechanism
- 1 June 1969
- journal article
- research article
- Published by Taylor & Francis in Philosophical Magazine
- Vol. 19 (162) , 1093-1103
- https://doi.org/10.1080/14786436908228636
Abstract
The change in the flow stress Δτ resulting from an incremental change in strain rate is predicted for a Peierls mechanism. In particular, consideration is given to the effect of the mobile dislocation density on the pre-exponential term of the rate equation. The calculations show that Δτ is strongly dependent upon the temperature, base strain rate, and strain-rate ratio. In addition Δτ is a direct function of the mobile dislocation density and can be dependent on the state of deformation. Thus a Peierls mechanism does not require Δτ to be independent of the flow stress, as implied in the literature. The results of the calculation are compared with published data for iron, and suggest a change in the mechanism for iron at approximately 200°K.Keywords
This publication has 15 references indexed in Scilit:
- On the temperature dependence of the lower yield stress of polycrystalline ironPhilosophical Magazine, 1967
- The flow stress of body-centered cubic metals: inherent lattice hardening or solution hardening?Acta Metallurgica, 1967
- The mechanical properties of pure iron tested in compression over the temperature range 2 to 293 °KPhilosophical Transactions of the Royal Society of London. Series A, Mathematical and Physical Sciences, 1967
- Comment on “the effect of carbon on the strain rate sensitivity of iron single crystals”Acta Metallurgica, 1967
- The relationship between dislocation density and flow stress in materials deforming by a peierls-nabarro mechanismPhilosophical Magazine, 1967
- Low-temperature deformation of body-centred cubic metals. II. Mechanism of thermally activated flowProceedings of the Royal Society of London. Series A. Mathematical and Physical Sciences, 1964
- The stress dependence of dislocation velocity, and its relation to the strain rate sensitivityActa Metallurgica, 1964
- Theory of Dislocation Mobility in SemiconductorsPhysical Review B, 1963
- The effect of temperature and strain rate on the flow stress of ironActa Metallurgica, 1962
- The Influence of Temperature and Strain Rate on the Flow Stress of Annealed and Decarburized Iron at Subatmospheric TemperaturesAustralian Journal of Physics, 1960