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首页> 外文期刊>Journal of Materials Engineering and Performance >Microstructure Evolution of a Ti-Based Bulk Metallic Glass Composite During Deformation
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Microstructure Evolution of a Ti-Based Bulk Metallic Glass Composite During Deformation

机译：钛基大块金属玻璃复合材料变形过程中的组织演变

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摘要

The deformation behavior of Ti50Zr20Nb12Cu5Be13 bulk metallic glass composite at room temperature was investigated by uniaxial compression tests. The results indicate that the composite exhibits excellent compressive properties at ambient temperature with high fracture strength (about 2425 MPa) and outstanding plasticity (about 23%). All the true stress-strain curves of Ti50Zr20Nb12Cu5Be13 display work-hardening effect with the same tendency which decreases with the increase of the strain. The dendrite morphology almost does not change before yielding, and there are only a few shear bands in the bulk metallic glass composite after yielding. More interestingly, the plastic deformation of dendrites can be observed evidently. Before fracture, the plastic deformation of dendrite becomes more severe, and the dendrite is stretched and more shear bands appear in the composite. Combined with the fracture surface, it can be concluded that the large step shape area, plastic dimple fracture, and shear bands are the evidences of an excellent plasticity in Ti50Zr20Nb12Cu5Be13 bulk metallic glass composite.
机译：通过单轴压缩试验研究了Ti50Zr20Nb12Cu5Be13大块金属玻璃复合材料在室温下的变形行为。结果表明，该复合材料在环境温度下表现出优异的压缩性能，具有高断裂强度（约2425 MPa）和出色的可塑性（约23％）。 Ti50Zr20Nb12Cu5Be13的所有真实应力-应变曲线均显示出加工硬化效应，并具有相同的趋势，随应变的增加而减小。枝晶形态在屈服前几乎没有变化，屈服后在块状金属玻璃复合物中只有少数剪切带。更有趣的是，可以明显观察到树枝状晶体的塑性变形。在断裂之前，枝晶的塑性变形变得更严重，并且枝晶被拉伸并且在复合物中出现更多的剪切带。结合断裂表面，可以得出结论，较大的台阶形状区域，塑性凹痕断裂和剪切带是Ti50Zr20Nb12Cu5Be13块状金属玻璃复合材料优异塑性的证据。

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