Mechanical behavior of shear bands and the effect of their relaxation in a rolled amorphous Al-based alloy
Mechanical behavior of shear bands and the effect of their relaxation in a rolled amorphous Al-based alloy
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DOI：
10.1016/j.actamat.2005.04.003
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发表时间：
2005-07
期刊：
影响因子：
9.4
通讯作者：
W. Jiang;F. Pinkerton;M. Atzmon
中科院分区：
文献类型：
--
作者：
W. Jiang;F. Pinkerton;M. Atzmon
利用纳米压痕、原子力显微镜和高分辨率透射电子显微镜（HRTEM）研究了冷轧及后续退火对非晶Al-Ni-Y合金显微组织和力学行为的影响。与纺丝合金相比，轧制可缓和锯齿状流动。退火恢复了锯齿状流动，轧制/退火样品表现出比纺丝样品更明显的锯齿状。轧制降低了硬度，而退火则大大提高了硬度。将HRTEM和频率滤波相结合，对轧制和轧制/退火试样剪切带的纳米空洞进行了成像。在轧制后的试样中，剪切带内部存在大量的纳米孔隙。退火不会改变它们的分布。多余的自由体积对剪切带的塑性变形抗力的影响比纳米孔隙的影响更大。
Using nanoindentation, atomic force microscopy and high-resolution transmission electron microscopy (HRTEM), the effect of cold rolling and subsequent annealing on the microstructure and mechanical behavior of an amorphous Al–Ni–Y alloy has been investigated. Rolling moderates the serrated flow as compared with the as-spun alloy. Annealing recovers the serrated flow, and the rolled/annealed sample exhibits even more pronounced serrations than the as-spun sample. Rolling reduces the hardness, whereas annealing enhances it substantially. Combining HRTEM with frequency filtering, nanovoids at shear bands in the rolled and rolled/annealed samples were imaged. In the rolled sample, a great number of nanovoids are located in the interior of shear bands. Annealing does not change their distribution. The excess free volume has a more substantial impact on the plastic-deformation resistance of shear bands than do the nanovoids.