Kocich Radim
Faculty of Materials Science and Technology, VŠB-Technical University of Ostrava, 70800 Ostrava, Czech Republic.
Materials (Basel). 2020 Sep 11;13(18):4047. doi: 10.3390/ma13184047.
The research and development of modern metallic materials goes hand in hand with increasing their lifetime via optimized deformation processing. The presented work deals with preparation of an Al/Cu clad composite with implemented reinforcing Cu wires by the method of twist channel angular pressing (TCAP). Single and double pass extrusion of the clad composite was simulated numerically and carried out experimentally. This work is unique as no such study has been presented so far. Detailed monitoring of the deformation behavior during both the passes was enabled by superimposed grids and sensors. Both the sets of results revealed that already the single pass imparted significant effective strain (higher than e.g., conventional equal channel angular pressing (ECAP)), especially to the Al matrix, and resulted in notable deformation strengthening of both the Al and Cu composite components, which was confirmed by the increased punch load and decreased plastic flow velocity (second pass compared to first pass). Processing via the second pass also resulted in homogenization of the imposed strain and residual stress across the composite cross-section. However, the investigated parameters featured slight variations in dependence on the monitored location across the cross-section.
现代金属材料的研发与通过优化变形加工来延长其使用寿命密切相关。本文所开展的工作涉及采用扭转通道角挤压（TCAP）方法制备一种带有内置增强铜丝的铝/铜复合板材。对该复合板材进行了单道次和双道次挤压的数值模拟及实验研究。这项工作具有独特性，因为迄今为止尚未有此类研究报道。通过叠加网格和传感器能够对两道次挤压过程中的变形行为进行详细监测。两组结果均表明，单道次挤压就已产生了显著的有效应变（高于例如传统等通道角挤压（ECAP）），尤其是对铝基体而言，并且导致铝和铜复合组分均出现明显的变形强化，这通过冲头载荷的增加和塑性流动速度的降低（与第一道次相比的第二道次）得到了证实。通过第二道次加工还使得整个复合板材横截面上施加的应变和残余应力实现了均匀化。然而，所研究的参数因复合板材横截面监测位置的不同而存在细微变化。
