Percolating porosity in ultrafine grained copper processed by High Pressure Torsion
Percolating porosity in ultrafine grained copper processed by High Pressure Torsion
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DOI：
10.1063/1.4829705
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发表时间：
2013-11
影响因子：
3.2
通讯作者：
M. Wegner;J. Leuthold;M. Peterlechner;D. Setman;M. Zehetbauer;R. Pippan;S. Divinski;G. Wilde
中科院分区：
文献类型：
--
作者：
M. Wegner;J. Leuthold;M. Peterlechner;D. Setman;M. Zehetbauer;R. Pippan;S. Divinski;G. Wilde
利用放射性示踪剂扩散技术研究了通过具有不同加工参数的高压扭转 (HPT) 变形的不同纯度（通常为 99.99 和 99.999 wt.%）的铜中的缺陷结构。在变形程度保持恒定的情况下，从互连内部孔隙的形成角度分析了施加的准静水压力、加工温度、变形后退火处理以及杂质浓度对变形样品的影响。此外，还检查了正在形成的孔隙网络的各向异性。孔隙通道沿平行于表面法线的方向相互连接，体积分数为几 ppm 量级，而当沿 HPT 处理的样品的方位角或径向方向测量时，无法检测到沿内部孔隙的长距离渗透。
Defect structures in copper of different purity (nominally 99.99 and 99.999 wt. %) deformed via High Pressure Torsion (HPT) with varying processing parameters are investigated utilizing the radiotracer diffusion technique. While the degree of deformation is kept constant, the effects of applied quasi-hydrostatic pressure, processing temperature, post-deformation annealing treatments, and of the impurity concentration on the deformed samples are analyzed in terms of the formation of interconnected internal porosity. Furthermore, the anisotropy of the developing porosity network is examined. The porosity channels occurred to be interconnected along the direction parallel to the surface normal with a volume fraction of the order of a few ppm while no long-range penetration along the internal porosity could be detected when measured along the azimuthal or radial directions of a HPT processed sample.