Transactions of Materials and Heat Treatment

Title：Research on metal flow and properties in continuous extrusion deformation zone for high copper alloy

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ClassificationCode：TG379

year,vol(issue):pagenumber：2021,46(10):0-0

Abstract：

In order to solve the quality problems of product stratification caused by uneven metal flow in continuous extrusion expansion forming, Cu-Sn alloy and Cu-Mg alloy were prepared by the continuous extrusion with different die cavity structures, and the macro and micro structures of alloys were observed by optical microscope and the micro-hardness was tested by Vickers hardness tester. The results show that the alloy material and the die cavity structure have a great impact on the metal flow, and the bigger ratio between the inlet and outlet cross-sectional areas leads to inadequate alloy expansion. The metal flow velocity of alloy in the upper and lower layers of the die cavity section is different, and the metal flow velocity in the lower layer is faster. The hardnesses of entrance zone and expansion zone of Cu-Sn alloy and Cu-Mg alloy are higher than that of the other areas, the Cu-Sn alloy has a maximum hardness value at the upper part of the entrance zone, and the Cu-Mg alloy has a maximum value in the lower part of the exit position for the expansion zone. There are adiabatic shear bands in the deformation zones of Cu-Sn alloy and Cu-Mg alloy, and the dynamic recovery and recrystallization occur during the continuous extrusion process. The microstructure in the basic deformation zone of Cu-Mg alloy is more uniform than that of Cu-Sn alloy, and the grains are smaller.

Funds：

江苏高校优势学科建设工程资助项目（PAPD）

作者简介：花思明（1987-），男，博士研究生 E-mail：huasiming1987@126.com 通信作者：张平则（1967-），男，博士，教授 E-mail：zhangpingze@nuaa.edu.cn

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