β Scribed by N. Louat
No coin nor oath required. For personal study only.
The temperature dependence of the yield stress in iron*
Erickson and Lo@' have recently suggested that the observed fattening of the yield-stress vs. temperature curve for iron at low temperatures may be due to the occmrence of tying rather than to the effect of s&mq&ere dew&y which is taken into account in Louat's modification~2' of the theory of CottreXl locking. It is the purpose of the present note to indicate that this suggestion is not necessarily at variance with the modified theory.
We suppose that twinning occurs by the process suggested by Cottrell and Bilbyc3) but with the additional eor:d:tion that the source dislocation (Burgers ye&or ajZ [llf] be sohte locked. Reme~~be~ng that only a dissociate part (Burgers vector a/6[lllIf
π SIMILAR VOLUMES
The ratio of the "activation energies" for grainboundary and lattice-diffusion processes is approximately constant for substitutional diffusion in facecentered cubic metals, e.g. the ratio for the selfdiffusion of silver is 0.44. Qn, the "activation energy" for the diffusional process controlling t
Data on the tensile yield behavior of poly(viny1 chloride) (PVC), reported in the literature, are interpreted in terms of a model involving a cooperative movement of several independent structural units, all with the same activation enthalpy. This analysis leads to physical parameters such as the in