Harničárová Marta, Valíček Jan, Kušnerová Milena, Palková Zuzana, Kopal Ivan, Borzan Cristina, Kadnár Milan, Paulovič Stanislav
Department of Electrical Engineering, Automation and Informatics, Faculty of Engineering, Slovak University of Agriculture in Nitra, Tr. A. Hlinku 2, 949 76 Nitra, Slovakia.
Department of Mechanical Engineering, Faculty of Technology, Institute of Technology and Business in České Budějovice, Okružní 10, 370 01 České Budějovice, Czech Republic.
Materials (Basel). 2021 May 16;14(10):2594. doi: 10.3390/ma14102594.
The formulation of the Hall-Petch relationship in the early 1950s has raised immense interest in studying the influence of the grain size of solid materials on their properties. Grain refinement can be achieved through extreme deformation. In the presented study, Equal-Channel Angular Pressing (ECAP) was successfully applied to produce an ultrafine-grained microstructure in a pure commercial Cu of 99.9 wt%. Samples were processed by ECAP at 21 °C for six passes via route A. A new equation of equilibrium that allows the exact determination of the number of extrusions and other technological parameters required to achieve the desired final grain size has been developed. The presented research also deals, in a relatively detailed and comparative way, with the use of ultrasound. In this context, a very close correlation between the process functions of extrusion and the speed of longitudinal ultrasonic waves was confirmed.
20世纪50年代初霍尔-佩奇关系的提出引发了人们对研究固体材料晶粒尺寸对其性能影响的极大兴趣。通过极端变形可以实现晶粒细化。在本研究中，等通道转角挤压（ECAP）成功应用于在纯度为99.9 wt%的纯商业铜中制备超细晶粒微观结构。样品在21℃下通过A路径进行六次ECAP加工。已经开发出一个新的平衡方程，该方程可以精确确定实现所需最终晶粒尺寸所需的挤压次数和其他工艺参数。本研究还相对详细且比较性地探讨了超声波的使用。在这种情况下，证实了挤压过程函数与纵向超声波速度之间存在非常紧密的相关性。
