(中南大学 材料科学与工程学院，长沙 410083)
摘 要: 利用Geeble1500 热模拟实验机对双辊连续铸轧AZ31B镁板在变形温度为100 ℃，应变速率为10−3 s−1的条件下进行单轴压缩变形, 并利用金相显微镜和透射电子显微镜对其微观组织进行观察。结果表明：在上述的条件下变形时，合金中产生大量的孪晶，孪晶与孪晶之间相互交截，在孪晶界及孪晶交截区出现大量的位错，并且有动态再结晶核心及再结晶小晶粒，说明该合金中动态再结晶形核位置主要为孪晶界及孪晶−孪晶交截区。
关键字: AZ31B镁合金；孪生；孪晶−孪晶交截；动态再结晶；变形机制
（School of Materials Science and Engineering, Central South University, Changsha 410083, China）
Abstract:The uniaxial compression test was carried out on the Geeble1 500 simulator at 100 ℃ with the strain rate of 10−3 s−1 to analyze the compression behavior of twin-roll casting AZ31B Mg alloys, and their microstructures were studied by optical microscopy (OM) and TEM. The results show that a large number of twins are observed under the deformation conditions. In addition, twins intersect with each other and tangled dislocations locate in twins-intersected zone. Further more, a few dynamic recrystallization (DRX) nuclei and tiny DRX grains are observed in the twinning band and twins-intersections, which implies that the main places where DRX nuclei form are in twin boundaries and twins-intersection zones.
Key words: AZ31B Mg alloy; twinning, twins-intersection; dynamic recrystallization; deformation mechanism
