Improvement of strength and ductility synergy in a room-temperature stretch-formable Mg-Al-Mn alloy sheet by twin-roll casting and low-temperature annealing
Improvement of strength and ductility synergy in a room-temperature stretch-formable Mg-Al-Mn alloy sheet by twin-roll casting and low-temperature annealing
复制标题
DOI：
10.1016/j.jma.2021.07.017
复制
发表时间：
2022-04-01
影响因子：
17.6
通讯作者：
Kamado, S.
中科院分区：
文献类型：
--
作者：
Nakata, T.;Xu, C.;Kamado, S.
采用双辊铸轧和低温退火工艺，成功地提高了镁铝锰(AM30)合金板材的强塑性协同效应。采用双辊铸轧、均匀化、热轧、170℃等温退火工艺生产的AM30合金板材，沿轧制方向的抗拉强度为0.2%，断裂伸长率为33.1%。板材还表现出面内各向同性拉伸性能，横向0.2%的抗拉应力和断裂伸长率分别为176 Mpa和35.5%。虽然在相同的退火条件下，直接冷却铸造的板材也具有中等强度，但直接冷却铸造导致轧制和横向的延伸率分别下降了23.9%和30.0%。H双辊铸轧薄板不仅具有优良的拉伸性能，而且具有较高的室温拉伸成形性，其Erichsen指数为8.3 mm。较高温度的退火进一步改善了拉伸成形性，但这导致拉伸性能下降。显微组织分析表明，双辊铸轧板材在低温退火热处理后具有良好的强度、塑性和拉伸成形性，这主要归因于其均匀的再结晶组织、细小的晶粒尺寸和偏离板材法线方向的(0001)极的圆形分布。(C)2021年重庆大学。爱思唯尔公司代表科爱通信有限公司提供的出版服务。
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 degrees 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 degrees 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. (C) 2021 Chongqing University. Publishing services provided by Elsevier B.V. on behalf of KeAi Communications Co. Ltd.