Transactions of Materials and Heat Treatment

Title：ECAP block forming process for pure copper nanocrystalline chips

Authors： Wu Chunling Nie Bin

Unit： School of Mechanical Engineering Hubei University of Technology

KeyWords： nanocrystalline chips equal channel angular pressing hot pressing synergy extrusion passes deformation resistance

ClassificationCode：TG376

year,vol(issue):pagenumber：2022,47(12):122-128

Abstract：

The influence laws of extrusion passes on equivalent strain, extrusion load and average equivalent stress for pure copper bar prepared by extruding nanocrystalline pure copper chips in equal channel angular pressing(ECAP) test were explored by the combination of finite element and experiment, and the influences of extrusion passes on nanocrystalline refinement and compactness of nano-formed block under hot pressing synergy were studied. The results show that with the increasing of extrusion passes, the average equivalent strain and equivalent stress of sample gradually increase, the uniformity of equivalent strain distribution in the deformation zone decreases, and the hardness of sample first increases and then decreases. With the increasing of extrusion passes, the curing forming effect of sample after extrusion at low passes (< 4 passes) is better. However, at high passes (> 4 passes), due to the effect of heating and high pressure on extruded sample, it is difficult for grains to fuse and consolidate, the pores and cracks in the material increase, and the deformation resistance of sample decreases.

Funds：

国家自然科学基金资助项目（51505135）

聂斌（1996-），男，硕士研究生 E-mail：nie_bin2019@163.com 通信作者：吴春凌（1976-），女，博士，副教授 E-mail：chunling_wu@126.com

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