Effect of loading rate on failure in Zr-based bulk metallic glass
Effect of loading rate on failure in Zr-based bulk metallic glass
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DOI：
10.1016/j.msea.2007.04.044
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发表时间：
2008-01
期刊：
影响因子：
6.4
通讯作者：
Yunfei Xue;H. Cai;L. Wang;Fu-chi Wang;H. Zhang
中科院分区：
文献类型：
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作者：
Yunfei Xue;H. Cai;L. Wang;Fu-chi Wang;H. Zhang
研究了室温下Zr38Ti17Cu10.5Co12Be22.5大块非晶合金在10 - 4 ~ 102 s-1应变速率范围内的单轴压缩行为。断裂应力以及应变被发现随着应变速率的增加而降低。受准静态载荷的试样发展成熟的剪切带和大量的塑性变形，断裂面相对光滑，并显示出一个发达的和均匀分布的混合物的脉状图案和河流状图案。另一方面，动态加载的试样，断裂沿着一个主要的剪切带与相对粗糙的断裂表面，如不均匀分布的脉状图案，微剪切带，微裂纹和液滴。实验结果表明，应变速率对本发明大块金属玻璃的断裂行为有很大影响。发现了负应变速率敏感性，并进行了详细讨论。
The uniaxial compressive behavior of Zr38Ti17Cu10.5Co12Be22.5bulk metallic glass was investigated over a wide strain rate range between 10−4and 102s−1at room temperature. Fracture stress as well as strain was found to decrease with increasing strain rate. Specimens subjected to quasistatic loading developed mature shear bands and substantial plastic deformations, fracture surfaces were relatively smooth and revealed a well developed and uniformly distributed mixture of vein-like patterns and river-like patterns. The dynamically loaded specimens, on the other hand, fractured along one dominant shear band with relatively rough fracture surfaces, such as non-uniformly distributed vein-like patterns, micro shear bands, microcracks and liquid droplets. The experimental results demonstrate that the fracture behavior of the present bulk metallic glass is strongly affected by the strain rate. A negative strain rate sensitivity was found and discussed in detail.