Investigation of the origins of Bauschinger effect in polycrystalline metals

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  • 多結晶金属におけるバウシンガー効果の発現機構に関する研究

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<p>In this study, we investigated origins of Bauschinger effect in polycrystalline metals using a finite element method incorporating a higher-order gradient crystal plasticity theory in which it is possible to impose microscopic (extra) boundary conditions. In a boundary value problem of polycrystalline metals, we focus on two types of material defect, i.e. grain boundaries and heterogeneous dislocation structure, as origins of Bauschinger effect. When grain boundaries are assumed to be hard interfaces being impenetrable for dislocations without taking account of heterogeneous dislocation structure, a strong Bauschinger effect appears with refinement of the grain size. When grain boundaries are assumed to have the same property as that of the bulk part of the material, only a weak Bauschinger effect is observed. On the other hand, with a heterogeneous dislocation structure, the Bauschinger effect appears without assuming any special property for grain boundaries and dependency of the grain size on the amount of Bauschinger effect is small. The effect of heterogeneous dislocation structure cannot be neglected to account for the Bauschinger effect, and the grain boundaries may not play a role of strong barriers to dislocation movement.</p>

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