High-energy X-ray measurements of structural anisotropy and excess free volume in a homogenously deformed Zr-based metallic glass
High-energy X-ray measurements of structural anisotropy and excess free volume in a homogenously deformed Zr-based metallic glass
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DOI：
10.1016/j.actamat.2006.01.026
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发表时间：
2006-05
期刊：
影响因子：
9.4
通讯作者：
R. Ott;M. Kramer;M. Besser;D. Sordelet
中科院分区：
文献类型：
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作者：
R. Ott;M. Kramer;M. Besser;D. Sordelet
利用高能X射线散射测量了均匀变形Zr基非晶合金的结构各向异性和过剩自由体积。散射结果表明，等温拉伸蠕变后的样品中存在键长各向异性。平行于拉伸加载轴方向的平均原子键长大于垂直于加载轴方向的平均原子键长。键长各向异性的大小被发现是依赖于宏观塑性应变的梯度沿着标距。此外，散射结果表明，过剩自由体积也随着宏观塑性应变的增加。自由体积变化的差示扫描量热法分析结果沿着标距蠕变样品是一致的，从X射线散射实验的结果。
We have used high-energy X-ray scattering to measure the structural anisotropy and excess free volume in a homogeneously deformed Zr-based metallic glass alloy. The scattering results show that bond length anisotropy is present in the samples following isothermal tensile creep deformation. The average atomic bond length in the direction parallel to the tensile loading axis is larger than that in the direction normal to the loading axis. The magnitude of the bond length anisotropy is found to be dependent on the gradient of macroscopic plastic strain along the gauge length. Furthermore, the scattering results show that the excess free volume also increases with increasing macroscopic plastic strain. Results from differential scanning calorimetry analysis of free volume variations along the gauge length of the creep samples are consistent with results from the X-ray scattering experiments.