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通过Hopkinson压杆冲击实验进行了不同应变率和不同高径比的AZ80变形镁合金的动态力学行为与组织性能研究。得出的主要结论如下:挤压态AZ80合金试样,应变率越高,合金的断裂强度和断裂应变越大,而冲击后的合金中越容易产生细化的孪晶组织。在应变率相近而高径比较小时,随应变增加应力增加幅度增大。在冲击速度相近而高径比较小时,冲击后的合金容易得到细化的孪晶组织。
The dynamic mechanical behaviors and microstructures of AZ80 deformed magnesium alloy with different strain rates and different aspect ratios were studied by Hopkinson pressure bar impact test. The main conclusions are as follows: In the as-extruded AZ80 alloy sample, the higher the strain rate, the greater the fracture strength and fracture strain of the alloy, while the more refined twinned structure is more likely to occur in the alloy after impact. When the strain rate is similar but the height diameter is small, the increase of stress increases with the increase of strain. In the impact velocity and high diameter is relatively small, the alloy after impact easily get refined twins.