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Preyield Delayed Yielding and the Yield
B Grain Boundary Deformation
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activation energy aluminum approximately atoms bicrystal samples Bicrystal Series body-centered cubic boundary angle boundary shear rate boundary yield stress cal/mole cm/sec constant extension rate Cottrell Creep Deformation cross slip crystal slip curve for Bicrystal curve for grain deformation energies for creep experimental extension 12X face-centered cubic fairly constant load Figure glide dislocations glide planes grain boundary contribution grain boundary shear grain boundary yield high temperatures incubation initial boundary shear LfN LfN LfN low stresses McLean Measured initial boundary mechanism Metals observed orientations polycrystalline present rate equation rate of boundary resolved shear stress Resolved shear stress—extension screw dislocations shear data shear fault shear stress shear stress—extension curve single crystals slip bands slip systems steady-state region strain rate stress dependence substructure suggested temperature dependence tensile tion total extension velocity yield point ил ил ил ЧО