非均匀结构氧化铝铜合金力学和电学性能研究  

Mechanical and Electrical Properties of Heterostructured Cu-Al_(2)O_(3) Copper Alloys

作　　者：麦俊杰 揭晓华[1,2] 麦永津 MAI Junjie;JIE Xiaohua;MAI Yongjin(School of Materials and Energy,Guangdong University of Technology,Guangzhou 510006,China;Advanced Metal Materials and Forming Engineering Technology Research Center of Guangdong Province,Guangzhou 510006,China)

机构地区：[1]广东工业大学材料与能源学院,广东广州510006 [2]广东省先进金属材料及成形加工工程技术研究中心,广东广州510006

出　　处：《铜业工程》2024年第5期88-96,共9页Copper Engineering

基　　金：广东省重点研发计划项目(2023B0101010002)资助。

摘　　要：在尽可能少地牺牲铜的导电性能的前提下大幅度提高其强度,即实现铜的高强高导,仍是一项极具挑战的任务。本文基于在铜合金中构筑非均匀结构的策略,以纯铜粉和氧化铝弥散强化铜合金粉为原料,结合热压烧结、轧制和再结晶退火,制备了一系列软组元被硬组元包裹的片层状非均匀结构铜合金。研究了软/硬组元占比对非均匀结构铜合金强度、导电率和塑性的影响及作用机制。研究发现:软/硬组元占比为1/4时,非均匀结构铜合金获得了抗拉强度为468 MPa、导电率为89.5%IACS和均匀延伸率为8.4%的良好综合性能。软、硬组元间明显的力学性能差异和组元间较强的约束作用,使界面处产生大量的几何必需位错。这些额外储存的几何必需位错贡献了额外的强化和加工硬化,提高了非均匀结构氧化铝弥散铜合金的强度和塑性。此外,还能促使自由电子运动散射较低的纯铜组元保持较高的导电性。Significantly increasing the strength of copper while sacrificing as little of its electrical conductivity as possible remains a challenging task.In this paper,a series of copper alloys with a lamella heterogeneous structure were produced by sintering Al_(2)O_(3) dispersion strengthened copper alloy powders and pure copper powders,followed by cold rolling and partial recrystallization annealing.The former formed hard components and the latter formed soft components which were embedded in a matrix of hard components.The effect and mechanism of volume fraction ratio of soft/hard components on their mechanical and electrical properties were investigated.With an optimized 1/4 volume fraction ratio of soft/hard components,the as-prepared heterostructured copper alloys have good comprehensive properties of 468 MPa tensile strength,89.5%IACS electrical conductivity and 8.4%uniform elongation.The obvious difference in mechanical properties and the strong mutual constraint between the soft and hard components caused a large number of geometrically necessary dislocations at the interface.These extra stored geometrically necessary dislocations contributed to extra strengthening and work hardening,thus improving the strength and ductility of heterostructured copper alloys.In addition,pure copper components scattered less of the free electron movement,thus maintaining a high level of electrical conductivity.

关 键 词：非均匀结构材料 几何必需位错 额外强化 力学性能 导电率 

分 类 号：TG146.11[一般工业技术—材料科学与工程]