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采用统计学方法研究了应变速率对Zr_(67.76)Cu_(11.94)Ni_(8.30)Al_(12)非晶复合材料力学性能及锯齿流变行为的影响。结果表明:随着应变速率的增加,材料的塑性应变减小,抗压强度下降;同时应力降幅Δσ的锯齿分布从单调下降分布转变为峰状分布,应力降幅的频数由小应力降幅区间向大应力降幅区间过渡,单位塑性应变的锯齿频数M呈下降趋势,试棒侧面剪切带数量减少且相互交割、分支、阻止作用明显减弱,此时,由多重剪切带扩展转变为单一剪切带扩展,使得材料的力学性能迅速下降。
The effect of strain rate on the mechanical properties and sawtooth rheological behavior of the amorphous Zr_ (67.76) Cu_ (11.94) Ni_ (8.30) Al_ (12) amorphous composites was investigated by statistical methods. The results show that as the strain rate increases, the plastic strain of the material decreases and the compressive strength decreases. At the same time, the sawtooth distribution of stress drop Δσ changes from monotonous drop distribution to peak shape distribution. The frequency of stress drop decreases from small stress drop range to large In the transitional region with decreasing stress, the sawtooth frequency M per unit plastic strain decreases. The number of shear bands on the side of the test rod decreases and the intercrossing, branching and blocking effects are obviously weakened. In this case, the multiple shear bands expand and transform into a single shear band Expansion, making the mechanical properties of the rapid decline.