不均一超微細粒組織を有するマグネシウム合金の変形機構の解明

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We found out that de-twinning takes place in a specimen scale with formation, propagation, and annihilation of strain-localized banding during the tensile test. This is a new finding in AZ31 Mg alloy. Furthermore, we realized that AZ31 Mg alloy accompanying de-twinnning shows microscopic inhomogeneous deformation due to de-twinning and slip activation is also important. In order to investigate why the 0o specimen showing significant de-twinning behavior shows such different tensile properties in comparison to the 90o specimen showing the general shape of tensile properties, the deformation behavior of each specimen needs to be investigated. Therefore, we conducted a micro-DIC analysis to examine the effect of slip and de-twin on deformation. As a result, we figured out that not only the strain distribution of the 0o specimen was heterogeneous due to de-twinning, but also the strain distribution of the 90o specimen was inhomogeneous due to the slip deformation.The slip behavior of each specimen must be taken into account to understand what kinds of slip deformation are activated and why the stress-strain curve is so much different. We investigated which kinds of slip systems of a pre-compressed AZ31 alloy were activated. Basal <a> slip was mainly activated in the matrix and pre-twinned region. We still need to investigate the deformation structure of tensile deformed specimens to know whether <c+a> or prismatic slip was activated or not.