弥散强化铜中碳纳米管和氧化钇的协同强化机制  

Synergistic strengthening mechanism of CNT and Y_(2)O_(3) in dispersion strengthened copper

作　　者：秦永强[1,2,3] 司永健 罗来马 马冰[1] 张一帆 吴玉程 QIN Yong-qiang;SI Yong-jian;LUO Lai-ma;MA Bing;ZHANG Yi-fan;WU Yu-cheng(School of Materials Science and Engineering,Hefei University of Technology,Hefei 230009,China;National-Local Joint Engineering Research Centre of Nonferrous Metals and Processing Technology,Hefei 230009,China;Engineering Research Center of High Performance Copper Alloy Materials and Processing,Ministry of Education,Hefei 230009,China)

机构地区：[1]合肥工业大学材料科学与工程学院,安徽合肥230009 [2]有色金属与加工技术国家地方联合工程研究中心,安徽合肥230009 [3]高性能铜合金材料及成形加工教育部工程研究中心,安徽合肥230009

出　　处：《材料热处理学报》2023年第10期33-41,共9页Transactions of Materials and Heat Treatment

基　　金：安徽省自然科学基金(2208085ME122);安徽省科技重大专项(202103a05020002);国家重点研发计划资助项目(2019YFE03120002)。

摘　　要：采用固液掺杂结合放电等离子体烧结法制备了Y_(2)O_(3)和CNT两种增强相材料协同强化Cu基复合材料。研究了不同含量增强相对复合材料力学性能和物理性能的影响,并研究了氧化钇和碳纳米管颗粒的协同强化机制。结果表明:Y_(2)O_(3)具有弥散强化作用,在烧结过程中阻碍了铜晶粒的生长,并对位错运动起到钉扎作用,可提高复合材料的强度;碳纳米管对复合材料导电性能的提升起着重要作用;Cu-0.9 vol%Y_(2)O_(3)-0.9 vol%CNT复合材料的综合性能最佳,导电率达到92.43%IACS,硬度、抗拉强度和伸长率分别为107.25 HV0.1、182.29 MPa和20.93%。复合材料的强化机制主要为奥罗万机制、细晶强化、热失配强化和载荷转移强化。Cu matrix composites with synergistic reinforcement of Y_(2)O_(3) and carbon nanotube(CNT)were prepared by solid-liquid doping combined with spark plasma sintering method.The effects of different content of two reinforcement phases on mechanical and physical properties of the composites were studied,and the synergistic strengthening mechanism of Y_(2)O_(3) and CNT particles was studied.The results show that the Y2O3 has a dispersion strengthening effect,hindering the growth of copper grains during sintering and playing a pinning role in dislocation movement,which can improve the strength of the composites.Carbon nanotubes play an important role in improving the conductivity of the composites.The comprehensive performance of the Cu-0.9 vol%Y_(2)O_(3)-0.9 vol%CNT composites is the best,with a conductivity of 92.43%IACS,hardness,tensile strength and elongation of 107.25 HV0.1,182.29 MPa and 20.93%,respectively.The strengthening mechanisms of the composites mainly include Orowan mechanism,fine-grained strengthening,thermal mismatch strengthening,and load transfer strengthening.

关 键 词：碳纳米管 氧化钇 协同强化 弥散强化铜 

分 类 号：TB333[一般工业技术—材料科学与工程]