Controlling the microstructure of magnesium alloy sheet during rolling
Controlling the microstructure of magnesium alloy sheet during rolling
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DOI：
10.1016/j.msea.2013.12.059
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发表时间：
2014-02
期刊：
影响因子：
6.4
通讯作者：
Se-Jong Kim;C. Yim;Youngseon Lee;Jonghun Yoon;Junghwan Lee
中科院分区：
文献类型：
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作者：
Se-Jong Kim;C. Yim;Youngseon Lee;Jonghun Yoon;Junghwan Lee
在室温、373 K和673 K下，将嵌入钢块中的热轧镁合金板以3%的厚度压下量轧制在一起。轧制后观察到拉伸孪晶，这在没有钢块的情况下轧制镁合金板时不能发现。孪晶分数是最高的，在373 K，因为在高温下的热膨胀和激活非基底滑移系统。电子背散射衍射分析和有限元模拟证实了具有较高强度的钢块在镁合金板中产生沿着横向的压应力方面起着重要作用。在373 K下，由于镁合金板的热膨胀受到抑制，压应力可能会增加。屈服应力和拉伸应力变得更高的轧制试样与钢块在373 K比在试样没有它由于晶粒细化引起的拉伸孪晶。
A hot rolled magnesium alloy sheet embedded in a steel block was rolled together with 3% thickness reduction at room temperature, 373 K, and 673 K. Tensile twins were observed after the rolling, which could not be found when the magnesium alloy sheet was rolled without the steel block. The twin fraction was the highest at 373 K because of thermal expansion and activating non-basal slip systems at high temperature. Electron back-scattered diffraction analysis and finite element simulations confirmed that the steel block with higher strength played an important role in generating compressive stress along the transverse direction in the magnesium alloy sheet. The compressive stress could increase owing to suppression of thermal expansion in the magnesium alloy sheet at 373 K. The yield stress and the tensile stress became higher in the rolled specimen with the steel block at 373 K than in the specimen without it owing to grain refinement caused by tensile twins.