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通过扫描电镜、拉伸实验研究了Li添加量对热轧Mg-Al-Zn镁合金组织和力学性能的影响。结果表明:Li元素含量较低的合金具有相近的轧制态组织,都存在较多的剪切带结构,剪切带边缘生成了众多孪晶。当Li含量逐渐升高后,基体内的剪切带数量降低,原先的变形组织沿着轧制方向被拉长,而晶粒中依然具有众多孪晶。合金中的Li含量上升后,板材表现为更加明显的各向异性特征;合金屈服点逐渐弱化,拉伸曲线产生了锯齿波现象;样品轴比下降使得柱面的滑移过程更易发生。
The effect of Li content on the microstructure and mechanical properties of hot-rolled Mg-Al-Zn magnesium alloy was investigated by scanning electron microscope and tensile test. The results show that the alloys with lower Li content have similar rolling structure with more shear band structures, and many twins are generated at the edge of the shear band. When the content of Li gradually increases, the number of shear bands in the matrix decreases. The original deformed structure is elongated along the rolling direction, while the crystal grains still have many twins. When the content of Li in the alloy increases, the sheet exhibits more obvious anisotropic characteristics; the yield point of the alloy gradually weakened and the tensile curve produced sawtooth phenomenon; the slip ratio of sample axis makes the slip of cylinder easier to happen .