The Temperature Dependence of Slip Planes in Fe‐3.4% Si Single Crystals

The temperature dependence of macroscopic slip planes observed on tension and compression sides of specimens deformed slowly by four‐point bending has been investigated over the temperature range 195 to 483 °K. The experimental results are presented in form of Ψ(χ)‐curves. The measured Ψ (χ)‐curves were compared with the curves calculated by Vítek using the theory of thermally activated motion of screw dislocations extended on {110} and {112} planes and good agreement was found above room temperature. Discrepancies between the calculated and measured Ψ(χ)‐curves exist at low temperatures, where slip along {110}‐planes becomes significant. Differences between the Ψ(χ)‐curves measured on the tension and the compression side cannot be satisfactorily explained by existing theories.