不同轧制工艺参数条件下AZ31镁合金孪晶和织构的演变规律及其对力学性能的影响（英文）

发布时间：2018-05-08 21:27

本文选题：AZ镁合金 + 动态再结晶　；参考：《Transactions of Nonferrous Metals Society of China》2015年11期

【摘要】：为了考察轧制工艺参数对板材显微组织和力学性能的影响,通过不同温度和轧制变形量的热轧工艺得到具有不同晶粒尺寸、基面织构强度和孪晶类型的AZ31镁合金轧制板材。拉伸孪晶、压缩孪晶和双孪晶的体积分数与AZ31镁合金轧制板材的晶粒尺寸有关。当轧制温度为523 K、轧制变形量为10%时轧制得到的板材,三种类型孪晶的体积分数最高,此时晶粒尺寸最大。在轧制温度分别为523和473 K时,板材发生完全动态再结晶的临界变形量分别为30%和40%。拉伸实验结果表明:随着轧制变形量的增加,在第一阶段,轧制后板材屈服强度的提高主要依赖于晶粒细化强化和织构强化;当晶粒尺寸随变形量的增加不再发生明显的细化时,板材的屈服强度主要受织构弱化的影响。
[Abstract]:In order to investigate the effect of rolling process parameters on the microstructure and mechanical properties of AZ31 magnesium alloy rolled sheet with different grain size, basal texture strength and twin type were obtained by hot rolling process with different temperature and rolling deformation. The volume fraction of tensile twin, compression twin and double twin is related to the grain size of AZ31 magnesium alloy rolled sheet. When the rolling temperature is 523K and the rolling deformation is 10, the volume fraction of the three types of twins is the highest, and the grain size is the largest. When the rolling temperature is 523 and 473K, the critical deformation of the plate is 30% and 40% respectively. The results of tensile test show that, with the increase of rolling deformation, the increase of yield strength of rolled sheet mainly depends on grain refinement and texture strengthening in the first stage. The yield strength of the plate is mainly affected by the weakening of texture when the grain size does not change obviously with the increase of deformation.
【作者单位】：哈尔滨工业大学材料科学与工程学院金属精密热加工国家级重点实验室;
【分类号】：TG339;TG146.22

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