
doi: 10.1007/bf00664180
1. Grain boundary slip was investigated in polycrystalline beryllium of commerical purity. It was found that ɛgb is directly proportional to the total deformation, i.e, ɛgb=γɛ∑. The value of γ varies in a complex manner with the deformation temperature. 2. It is proposed that the reduction of γ at 500°C is due to formation of precipitates in grain bound-aries resulting from strain aging. 3. A substantial role in the process of grain boundary slip is played by Nabarro-Herring creep, which is capable of accomodating deformation without slip in neighboring grains.
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