Conference Proceedings, Volume 1

Acta activation energy alloys annealing applied stress athermal bcc metals behavior Burgers vector calculated compression concentration constant creep cross slip cyclic hardening decrease determined dislocation density dislocation velocity edge dislocations effective stress elastic electron equation flow stress glide grain boundary increase interaction internal stress iron kg/mm² kink lattice load drop loops low temperatures measured mobile dislocation modulus molybdenum niobium observed obstacles obtained orientation oxygen parameter Peierls Phil Phys plastic deformation plastic strain polycrystals prestrained prismatic slip pure resolved shear stress room temperature screw dislocations shown in Fig shows single crystals slip lines slip plane slip systems solid solution solute atoms solution hardening specimens stacking fault stacking fault energy strain rate strength stress amplitudes stress relaxation stress-strain curve structure superconducting surface tantalum temperature dependence tensile tension tests theory thermally activated tion titanium Trans transition twinning work-hardening Y/Gb yield stress