Microstructure and mechanical properties of Mg-5Li-1Al sheets processed by cross accumulative roll bonding

Microstructure and mechanical properties of Mg-5Li-1Al sheets processed by cross accumulative roll bonding
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交叉累积轧制Mg-5Li-1Al板材的显微组织与力学性能

DOI:
10.1016/j.jmapro.2019.09.004
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发表时间:
2019-10
影响因子:
6.2
通讯作者:
Milin Zhang
Milin Zhang
中科院分区:
工程技术2区
文献类型:
--
作者:
Huajie Wu;Tianzi Wang;Ruizhi Wu;Legan Hou;Jinghuai Zhang;Xinlin Li;Milin Zhang

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对Mg-5Li-1Al合金进行交叉累积滚压成形(CARB)。经处理的Mg-5Li-1Al板材具有超细晶组织,在保持16˜18%的伸长率的情况下,轧制方向(RD)和横向(TD)的强度均有所提高。适当的CARB工艺有助于改善Mg-5Li-1Al板材的力学性能各向同性。同时,CARB工艺对改善Mg-5Li-1Al板材的塑性也有一定的作用。随着CARB道次间方向的改变,Mg-5Li-1Al板材的基面织构减弱,非基面织构增强。棱柱滑移和金字塔滑移均被启动。变形机制主要由孪生变形转变为滑移变形,最后是剪切变形。其细化机制由孪晶动态再结晶转变为连续动态再结晶,再到旋转动态再结晶。
Mg-5Li-1Al alloy was processed by cross accumulative roll bonding (CARB). The processed Mg-5Li-1Al sheet possesses ultra-fine grains, and its strength increases both in the rolling direction (RD) and transverse direction (TD) with the elongation remaining 16˜18%. The proper CARB processing is helpful to improve the isotropy of mechanical properties of Mg-5Li-1Al sheet. At the same time, the CARB process has a beneficial effect on improving the plasticity of Mg-5Li-1Al sheet. With the change of the direction between the CARB passes, the basal texture of Mg-5Li-1Al sheet is weakened, and the non-basal texture is strengthened. Both prismatic slip and pyramidal slip are initiated. The dominant deformation mechanism changes from twin deformation to slip deformation, and finally shear deformation. The grain refinement mechanism changes from twin dynamic recrystallization to continuous dynamic recrystallization, and finally rotational dynamic recrystallization.
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