Effect of Structural Relaxation on Deformation Behaviour of Zr-Based Metallic Glass
Effect of Structural Relaxation on Deformation Behaviour of Zr-Based Metallic Glass
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DOI：
10.1088/0256-307x/23/7/059
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发表时间：
2006-07
影响因子：
3.5
通讯作者：
Liu Yuan;Zhang Taihua;Wei Bing-Chen;Xing Dong-Mei;Liu Wei-huo;Zhang Ling-chen
中科院分区：
文献类型：
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作者：
Liu Yuan;Zhang Taihua;Wei Bing-Chen;Xing Dong-Mei;Liu Wei-huo;Zhang Ling-chen
对Zr46.75Ti8.25Cu7.5Ni10Be27.5（Vitreloy-4）块体非晶合金进行了低于玻璃转变温度的等温退火结构弛豫。根据差示扫描量热法热分析图，缺陷浓度与退火时间t相关。利用纳米压痕仪研究了结构弛豫对材料力学性能和变形行为的影响。结果表明，在纳米压痕加载过程中，铸态合金表现出明显的锯齿状流动，锯齿的尺寸和数量随着退火时间的延长而减小。变形行为的变化与结构松弛解释使用自由体积模型。
Structural relaxation through isothermal annealing at temperature below glass transition is conducted on Zr46.75Ti8.25Cu7.5Ni10Be27.5 (Vitreloy-4) bulk metallic glass. Defect concentration is correlated with the annealing time t according to differential scanning calorimetry thermalgrams. The effects of structural relaxation on mechanical properties and deformation behaviour are investigated by using instrumented nanoindentation. It is found that the as-cast alloy exhibits pronounced serration flow during the loading process of nanoindentation, and the size and number of the serrations decrease with the annealing time. The change of the deformation behaviour with structural relaxation is explained using a free volume model.