Understanding room-temperature deformation behavior in a dilute Mg-1.52Zn-0.09Ca (mass%) alloy sheet with weak basal texture
Understanding room-temperature deformation behavior in a dilute Mg-1.52Zn-0.09Ca (mass%) alloy sheet with weak basal texture
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了解%20室温%20变形%20行为%20in%20a%20稀释%20Mg-1.52Zn-0.09Ca%20(质量%)%20合金%20片材%20with%20weak%20basal%20纹理
DOI：
10.1016/j.msea.2022.143638
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发表时间：
2022
期刊：
影响因子：
--
通讯作者：
S. Kamado
中科院分区：
文献类型：
--
作者：
T. Nakata;T. Hama;K. Sugiya;S. Kamado
使用电子背散射衍射技术和晶体塑性有限元方法对弱织构 Mg-1.52Zn-0.09Ca（质量％）合金板在室温单轴拉伸和弯曲试验中的变形行为进行了深入研究。由于基底滑移、棱柱滑移和拉伸孪生的容易激活，该片材沿横向表现出高达 46.1% 的断裂伸长率。尽管在沿轧制方向的拉伸变形过程中，基底滑移和拉伸孪晶的活动受到抑制，但由于棱柱滑移的激活，板材表现出令人满意的28.2%的断裂伸长率。值得注意的是，该片材表现出优异的拉伸性，极限圆顶高度为 10.1 毫米。这归因于一小部分基础纹理成分，它促进了拉伸形成过程中的基础滑移。然而，在弯曲变形过程中，棱柱滑移和拉伸孪晶变得不如单轴拉伸过程中活跃，导致其弯曲性能低于汽车级铝合金板。这可能有助于为室温可成型镁合金板材的开发建立微观结构设计指南。
The deformation behavior of a weakly textured Mg–1.52Zn–0.09Ca (mass%) alloy sheet during room-temperature uniaxial tensile and bending tests was thoroughly investigated using the electron backscattered diffraction technique and crystal plasticity finite-element method. The sheet exhibited a high elongation to failure of 46.1% along the transverse direction because of the easy activation of basal slips, prismatic slips, and tensile twinning. Although the activities of the basal slips and tensile twinning were suppressed during the tensile deformation along the rolling direction, the sheet showed a satisfactory elongation to failure of 28.2% owing to the activation of the prismatic slips. Notably, the sheet exhibited excellent stretchability with a limiting dome height of 10.1 mm. This was attributed to a small fraction of the basal texture component, which facilitated the basal slips during the stretch formation. However, during the bending deformation, the prismatic slips and tensile twinning became less active than during the uniaxial tension, affording inferior bendability to that of automotive-grade Al alloy sheets. This may help to establish microstructural design guidance for the development of room-temperature formable Mg alloy sheets.