汽车用镁合金温轧工艺与性能研究

Study on Warm Rolling Process and Properties of Mg Alloy for Automobile

以ZK60镁合金为研究对象,讨论了温轧工艺对镁合金显微组织和力学性能的影响。结果表明,镁合金温轧后显微组织由树枝晶变为纤维状的变形组织,轧制温度越高,动态再结晶越容易产生,且剪切带密度降低;将镁合金进行退火处理后,剪切带密度进一步降低。随着轧制温度的增加,镁合金薄带强度降低,伸长率增加。经退火处理后,强度低于相应温度轧制态,伸长率高于轧制态。随着道次间压下量的提高,镁合金组织中剪切带和孪晶密度增加,强度和伸长率增加。

Taking ZK60 magnesium alloy as the research object, the effects of the warm rolling process on the microstructure and mechanical properties of magnesium alloy were discussed. The results show that the microstructure of magnesium alloy after warm rolling changes from dendrites to fibrous microstructure. The higher of rolling temperature, the easier of the dynamic recrystallization, and shear band density is reduced. After annealing treatment, the density of the shear zone further reduces. With the increasing of rolling temperature, the strength of magnesium alloy sheet decreases, and the elongation increases. After annealing treatment, the strength is lower than that of the rolling state of corresponding temperature, and the elongation is higher that of than rolling state. With the increasing of the rolling reduction ratio per pass of magnesium alloy, the shear band density and twin crystal increase; the strength and elongation increase.