研究了长径比对Ti40Zr25Ni8Cu9Be18块体非晶合金压缩塑性的影响.结果表明,试样长径比人于1时具有很低的塑性,相反,长径比小于1时具有很好的塑性.试样断裂前延伸率最大达到了86%.试样塑性的差异是由于几何约束的限制对剪切带的行为产生了影响.剪切带密度(间距)随着应力的增加而线性增加,硬度随着塑性应变的增加而线性降低.研究结果与应力导致的局域结构膨胀和变形诱导剪切带内自由体积的增加是一致的.
The compressive plasticity of Ti10Zr25Ni8Cu9Be18 bulk metallic glass with different specimen aspect ratio was investigated.The specimens with aspect ratios A＞1 exhibit a poor plasticity, contrariwise, showing an excellent plasticity. The maximum elongation before failure is up to about 86%. The difference in the plasticity is a result of shear bands behavior due to the geometrical constraints. The results show a linear increase in the density (spacing) of shear bands with increasing of stress, and the hardness decreases linearly with increasing of plastic strain. The results are consistent with a strain-induced local dilatation, and the free volume in the glass increases after deformation relative to the undeformed glass.
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