锻压技术

引线框架用CuCrSnZnSi铜合金组织与性能

英文标题：Microstructure and properties of CuCrSnZnSi copper alloy for lead frames

作者：刘晓彬1 张延松1 王若兰1 冯宏伟1 邓立勋1 武峥1 龚留奎1 2 黄伟1

分类号：TG146.1

出版年,卷(期):页码：2024,49(8):205-213

摘要：

采用SEM、EBSD、XRD、TEM及力学、电学性能检测手段，研究了Cu-0.2Cr-0.252Sn-0.166Zn-0.014Si合金的微观组织结构与强化机制。结果表明，铸态Cu-0.2Cr-0.252Sn-0.166Zn-0.014Si合金经热轧+水冷、冷轧、时效、冷轧、退火处理后的抗拉强度、屈服强度、显微硬度、断后伸长率、导电率分别为483 MPa、452 MPa、178.0 HV0.2、9%和69.6%IACS。退火处理后合金平均晶粒尺寸约为1.20 μm，局部应变较高，晶粒错位角为17.15°，具有较强的择优取向，以Goss织构({110}<001>)和Copper织构({112}<11-1>)为主。Sn、Zn元素以固溶的形式弥散分布于基体中，Cr元素则以纳米相的形式分布于基体中，晶界强化是退火态Cu-0.2Cr-0.252Sn-0.166Zn-0.014Si合金的主要强化机制，Cr元素纳米析出强化与Sn、Zn元素固溶强化、位错强化相对较弱。

The microstructure and strengthening mechanism of Cu-0.2Cr-0.252Sn-0.166Zn-0.014Si alloy were studied using SEM, EBSD, XRD, TEM as well as mechanical and electrical performance testing methods. The results show that the tensile strength, yield strength, microhardness, elongation after fracture and conductivity of as-cast Cu-0.2Cr-0.252Sn-0.166Zn-0.014Si alloy after hot rolling+water cooling, cold rolling aging, cold rolling and annealing treatment are 483 MPa, 452 MPa, 178.0 HV0.2, 9% and 69.6%IACS, respectively. The average grain size of the alloy after annealing treatment is about 1.20 μm. The local strain is relatively high, with a grain dislocation angle of 17.15° and a strong preferred orientation, mainly characterized by Goss texture ({110}<001>) and Copper texture ({112}<11-1>). The elements Sn and Zn are dispersed in the matrix in a solid solution form, while the element Cr is distributed in the matrix in a nano phase form, the grain boundary strengthening is the main strengthening mechanism of annealed Cu-0.2Cr-0.252Sn-0.166Zn-0.014Si alloy, with relatively weaker element Cr nanoprecipitation strengthening, elements Sn and Zn solid solution strengthening and dislocation strengthening.

基金项目：

宁波市重点研发计划(2023Z096,2023Z092)；宁波市科技创新2025重大专项(2019B10083)

作者简介：刘晓彬(1987-)，女，硕士，副研究员 E-mail：47995715@qq.com 通信作者：黄伟(1981-)，男，博士，研究员 E-mail：hw315@126.com

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