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为了研究AZ80+T5镁合金轮毂动态力学行为,采用分离式Hopkinson压杆分析了轮辐部位的动态力学性能及其塑性变形机制。结果表明:在高应变率加载条件下,该镁合金表现出较明显的力学性能各向异性;随应变速率的增加,不同取样方向的塑性变形机制也有差异,即加载方向与轮辐径向平行,呈0°时,孪晶的数量呈先增加后减少的趋势;呈45°时,孪晶数量先增加后明显减少,流变曲线形状也由近乎线性到凸形;呈90°时,孪晶数量几乎不变,曲线呈凸形。3个取样方向均表现出正应变率效应,但0°取样方向的应变率效应明显低于其他两个方向。
In order to study the dynamic mechanical behavior of AZ80 + T5 magnesium alloy wheels, the dynamic mechanical properties of the spokes and the plastic deformation mechanism were analyzed using a split Hopkinson pressure bar. The results show that the magnesium alloy exhibits obvious anisotropy of mechanical properties under high strain rate loading. With the increase of strain rate, the plastic deformation mechanism in different sampling directions is also different, that is, the loading direction is parallel to the radial direction of the spokes, At 0 °, the number of twins first increased and then decreased. At 45 °, the number of twins first increased and then decreased significantly, and the shape of the rheological curve changed from nearly linear to convex. At 90 °, The number is almost constant, the curve is convex. All three samples show positive strain rate effect, but strain rate effect in 0 ° sampling direction is obviously lower than the other two directions.