Strength and ductility synergy in an Mg-3mass%Al-Mn (AM30) alloy sheet was successfully improved via twin-roll casting and annealing at low-temperature. An AM30 alloy sheet produced by twin-roll casting, homogenization, hot-rolling, and subsequent annealing at 170 °C for 64 h exhibits a good 0.2% proof stress of 170 MPa and a large elongation to failure of 33.1% along the rolling direction. The sheet also shows in-plane isotropic tensile properties, and the 0.2% proof stress and elongation to failure along the transverse direction are 176 MPa and 35.5%, respectively. Though the sheet produced by direct-chill casting also shows moderate strengths if the annealing condition is same, the direct-chill casting leads to the deteriorated elongation to failure of 23.9% and 30.0% for the rolling and transverse directions, respectively. As well as such excellent tensile properties, a high room-temperature stretch formability with an Index Erichsen value of 8.3 mm could be obtained in the twin-roll cast sheet annealed at 170 °C for 64 h. The annealing at a higher temperature further improves the stretch formability; however, this results in the decrease of the tensile properties. Microstructure characterization reveals that the excellent combination of strengths, ductility, and stretch formability in the twin-roll cast sheet annealed at the low-temperature annealing is mainly attributed to the uniform recrystallized microstructure, fine grain size, and circular distribution of (0001) poles away from the normal direction of the sheet.

通过双辊铸造和低温退火，成功提高了 Mg-3mass%Al-Mn (AM30) 合金板的强度和塑性协同作用。通过双辊铸造、均质化、热轧和随后在 170°C 下退火 64 h 生产的 AM30 合金板具有 170 MPa 的良好 0.2% 屈服强度和 33.1% 的大断裂伸长率沿轧制方向. 该板材还显示出平面内各向同性拉伸性能，沿横向的 0.2% 屈服强度和断裂伸长率分别为 176 MPa 和 35.5%。尽管通过直接冷硬铸造生产的薄板在退火条件相同的情况下也显示出中等强度，但直接冷硬铸造导致轧制和横向的破坏伸长率劣化分别为 23.9% 和 30.0%。除了如此优异的拉伸性能外，在 170°C 退火 64 小时的双辊铸板还可以获得具有 8.3 毫米指数埃里克森值的高室温拉伸成型性。高温退火进一步提高了拉伸成型性；然而，这会导致拉伸性能下降。显微组织表征表明，低温退火后双辊连铸薄板的强度、延展性和拉伸成形性的优异组合主要归功于均匀的再结晶组织、细晶粒尺寸和(0001)极的圆形分布。远离板材的法线方向。在 170 °C 下退火 64 小时的双辊铸板可以获得 3 mm 的厚度。高温退火进一步提高了拉伸成型性；然而，这会导致拉伸性能下降。显微组织表征表明，低温退火后双辊连铸薄板的强度、延展性和拉伸成形性的优异组合主要归功于均匀的再结晶组织、细晶粒尺寸和(0001)极的圆形分布。远离板材的法线方向。在 170 °C 下退火 64 小时的双辊铸板可以获得 3 mm 的厚度。高温退火进一步提高了拉伸成型性；然而，这会导致拉伸性能下降。显微组织表征表明，低温退火后双辊连铸薄板的强度、延展性和拉伸成形性的优异组合主要归功于均匀的再结晶组织、细晶粒尺寸和(0001)极的圆形分布。远离板材的法线方向。