等通道角轧制对AZ31镁合金板材组织与性能影响

发布时间：2018-10-14 18:17

【摘要】：镁合金具有比强度高、比刚度高、减震性和导热性良好等优点,得到了航空、航天和电子产品等行业的青睐。而镁合金是密排六方结构,所以其室温下塑性变形能力较差,变形的过程当中容易出现强烈的基面织构,这就大大限制了镁合金的应用。为了解决镁合金的应用难题,本论文采用等通道角轧制工艺对AZ31镁合金进行研究,并对室温等通道角轧制与150℃等通道角轧制工艺进行了对比研究。通过实验手段,研究了等通道角轧制对AZ31镁合金板材组织性能的影响规律,为镁合金的生产实际提供更好地理论依据与指导。本次实验系统的研究了室温ECAR和150℃ECAR对于AZ31镁合金板材组织性能的影响,并对比分析了两种工艺的轧制产品。得到如下结论:①室温等通道角轧制AZ31镁合金板材时,随着轧制道次的增加,板材的晶粒尺寸变化不大,AZ31镁合金板材的基面织构得到显著改善,由原始的8.19减弱到4.54。②经室温等通道角轧制后的镁合金板材综合性能得到大幅度改善。其抗拉强度由原始的278.0MPa增加到295.4MPa,屈服强度由原始的128.0MPa降低到79.8MPa,n值由原始的0.29提高到0.45,r值由原始的1.92降低到1.13,杯突值由原始的2.75mm提高到4.38mm。③150℃等通道角轧制AZ31镁合金时,随着轧制道次的增加,板材的晶粒尺寸变化同样不大,AZ31镁合金板材的基面织构同样得到大幅度改善,由原始的8.19减弱到3.58。④150℃等通道角轧制后板材的强度明显提高,塑性得到改善。其抗拉强度由原始的278.0MPa增加到307.0MPa,屈服强度由原始的128.0MPa降低到87.0MPa,n值由原始的0.29提高到0.49,r值由原始的1.92降低到0.90,板材各向异性得到大幅度改善。
[Abstract]:Magnesium alloy has the advantages of high specific strength, high specific stiffness, good shock absorption and thermal conductivity, and has been favored by aviation, aerospace and electronic products. The magnesium alloy is a hexagonal structure, so its plastic deformation ability is poor at room temperature, and it is easy to appear strong basic texture during the deformation process, which greatly limits the application of magnesium alloy. In order to solve the application problem of magnesium alloy, the equal channel angle rolling technology was used to study the AZ31 magnesium alloy in this paper, and the equal channel angle rolling process at room temperature and 150 鈩，

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