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采用光学显微镜对挤压态AZ61镁合金的显微组织进行了观察,利用Hopkinson杆杆测试技术对挤压态AZ61镁合金进行了高应变速率冲击拉伸试验,测定了该合金在不同应变速率下的完整动态应力-应变曲线;对该合金在高应变速率下动态应力-应变行为及其应变速率对挤压态AZ61镁合金的屈服行为及其断裂机制的影响进行了分析。结果表明,在整个加载过程中,材料的弹性模量变化很小;在拉伸过程中,该材料表现出明显的屈服点。随着应变速率的增加,材料的抗拉强度相应增大,失稳应变相应减小,但表现出的应变速率强化效应不明显。采用SEM对其断口进行分析,结果表明挤压态AZ61镁合金拉伸断口对应变速率不敏感,表现为以韧性为主伴有少量解理特征的混合断裂。
The microstructure of extruded AZ61 magnesium alloy was observed by optical microscope. The high tensile strain impact tensile test was carried out on the extruded AZ61 magnesium alloy by using Hopkinson rod test technology. The tensile test of the alloy under different strain rates The effect of dynamic stress-strain behavior and strain rate on the yield behavior and fracture mechanism of extruded AZ61 magnesium alloy at high strain rate was analyzed. The results show that the elastic modulus of the material changes little during the whole loading process, and the material shows obvious yield point during the stretching process. With the increase of strain rate, the tensile strength of the material increases correspondingly, and the instability strain decreases correspondingly, but the strengthening effect of strain rate is not obvious. SEM was used to analyze the fracture surface. The results show that the tensile fracture of extruded AZ61 magnesium alloy is not sensitive to the strain rate, which is characterized by mixed fracture with little cleavage characteristic.