AZ31Mg合金圧延材における引張および圧縮変形中のミクロ組織変化の観察

抄録

The influence of loading direction on microstructural development of rolled AZ31 magnesium alloy (average grain size: approximately 40μm) was investigated. Tension and compression test specimens were machined from rolled plate; loading axes were parallel (L-specimen) to and perpendicular (S-specimen) to the rolling direction. Mechanical anisotropy of both specimens were observed in stress-strain curves. Pseudoelastic behaviors were also observed in cyclic tension and compression loading-unloading and reloading stress-strain hysteresis curves. The large anelastic strains and work hardening coefficient were observed in compressive stress-strain hysteresis loops of the S-specimen. {10-12} deformation twins were observed uniformly as increasing plastic strain in compressive loading for the L-specimen. In contract, several different types of deformation twins were observed locally as increasing plastic strain in tensile loading for the L-specimen. The slips and deformation twins can play an important role in cyclic pseudoelastic behavior of polycrystalline magnesium alloy.