Free volume model: High-temperature deformation of a Zr-based bulk metallic glass
Free volume model: High-temperature deformation of a Zr-based bulk metallic glass
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DOI：
10.1016/j.actamat.2005.10.054
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发表时间：
2006-03-01
期刊：
影响因子：
9.4
通讯作者：
Soubeyroux, JL
中科院分区：
文献类型：
--
作者：
Bletry, M;Guyot, P;Soubeyroux, JL
研究了锆基大块非晶玻璃在玻璃化转变区的均匀变形。进行了不同温度、不同应变率下的压缩试验。在自由体积模型的框架下，考虑了流动缺陷浓度与油变形的关系，分析了流动缺陷的力学行为。激活体积被评估，并允许在唯一的主曲线上收集粘度数据(针对不同的应变率和温度)。此外，由于流动缺陷浓度与自由体积之间的关系，不可能直接从力学测量中推导出平衡流动缺陷浓度。然而，如果这个参数是任意选择的，机械测量就可以获得模型的其他参数，这些参数对于被研究的合金来说与其他金属玻璃的这些参数具有相同的数量级。(C)2005年Acta Materialia Inc.由爱思唯尔有限公司出版。保留所有权利。
The homogeneous deformation of a zirconium-based bulk metallic glass is investigated in the glass transition region. Compression tests at different temperatures and strain rates have been conducted. The mechanical behavior is analyzed in the framework of the free volume model, taking into account the dependence of the flow defect concentration oil deformation. The activation volume is evaluated and allows one to gather the viscosity data (for the different strain rates and temperatures) on a unique master curve. It is also shown that, due to the relation between flow defect concentration and free volume, it is not possible to deduce the equilibrium flow defect concentration directly from mechanical measurements. However, if this parameter is arbitrarily chosen, mechanical measurements give access to the other parameters of the model, these parameters for the alloy under investigation being of the same order of magnitude as those for other metallic glasses. (c) 2005 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.