Σ7およびΣ21傾角対応粒界を有するアルミニウム双結晶の塑性変形

概要

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Three types of isoaxial symmetrical bicrystals and their component single crystals were tested in tension to clarify the effect of grain boundary on plastic properties. The <111>oriented bicrystal was deformed by the mode similar to that of the <111> oriented single crystal. Fine multiple slips which appeared from the early stage of the deformation was suppressed at the boundary. It was found that the flow stress of this bicrystal was almost equal to that of the component single crystal and the effect of grain boundary on the flow stress did not appear. In two bicrystals having Σ7 and Σ21 coincidence tilt boundary respectively, each flow stress was increased by the presence of boundary. The boundary strength was rapidly increased from yield point to about 0.5% strain by the interaction between primary slips and additional slips in the vicinity of the boundary, and it was scarcely increased from about 1.0% to 5.0% strain. It was pointed out that the effect of grain boundary on the flow stress of a bicrystal is prominent by introducing multiple slips near the grain boundary in the stage-1 region of the component single crystal but not prominent in the stage-II region. The effect of grain boundary on the flow stress is negligible after multiple slips take place.
社団法人日本材料学会の論文
1979-02-15