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高铜合金连续挤压变形区金属流动及性能研究
英文标题:Research on metal flow and properties in continuous extrusion deformation zone for high copper alloy
作者:花思明1 2 张平则1 刘子利1 
单位:1.南京航空航天大学 2.中铁建电气化局集团康远新材料有限公司 
关键词:连续挤压 Cu-Sn合金 Cu-Mg合金 金属流线 显微组织 显微硬度 
分类号:TG379
出版年,卷(期):页码:2021,46(10):0-0
摘要:

 为解决连续挤压扩展成形中金属流动不均造成的产品分层等质量问题,采用不同型腔结构连续挤压制得Cu-Sn、Cu-Mg合金,借助光学显微镜和维氏硬度计,观察其宏观、微观组织,并测试其显微硬度。结果表明:合金的材质和模腔结构对金属流动影响较大,入口、出口截面积之比过大会导致合金扩展不完全;合金在腔体截面上、下层的金属流动速度不同,下层的金属流动速度较快;Cu-Sn和Cu-Mg合金的入口区和扩展区的硬度均高于其他位置,Cu-Sn合金在入口区上部存在硬度极大值,Cu-Mg合金在扩展区出口位置的下部存在极大值;Cu-Sn和Cu-Mg合金的变形区内均存在绝热剪切带,随着连续挤压过程的进行,均发生了动态回复和再结晶;Cu-Mg合金的基本变形区内的组织较Cu-Sn合金更均匀,且晶粒较细小。 

 

 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.

 
基金项目:
江苏高校优势学科建设工程资助项目(PAPD)
作者简介:
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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