繰返し曲げ加工によるマグネシウム合金の成形性の改善

（第2報, 非対称曲げの影響）

抄録

To improve cold formability of AZ31 magnesium alloy sheets were subjected to a continuous repetitive asymmetric roll bending by different roll diameter. The asymmetric roll bending increases the strain amount applied per 1 pass than a conventional symmetric one. It also can apply strain effectively at the center of the thick of the sheet due to change of neutral axis of bending. The Eriksen value was increased for subjected 2 passes asymmetrical roll bending and subsequent 160°C annealing with little decreasing the hardness of the sheet. The presence of deformation twins was observed both just after the asymmetric bending and subsequent 160°C annealing by optical micrograph, the low temperature annealing can suppress evolution of microstructure such as recrystallization or grain growth.