纳米晶Cu-Al合金去合金化制备纳米多孔铜及其力学性能研究  

Microstructures and mechanical properties of bulk nanoporous copper fabricated by dealloying Al-Cu alloys

作　　者：姚彦菲 连利仙[1] 刘颖[1,2] 孔清泉[1] 安旭光[1] 

机构地区：[1]四川大学材料科学与工程学院,成都610065 [2]先进特种材料及制备加工技术教育部重点实验室,成都610065

出　　处：《功能材料》2016年第5期180-184,共5页Journal of Functional Materials

基　　金：国家教育部高校博士点基金资助项目(20110181110002);四川省科技支撑计划资助项目(2014GZ0137)

摘　　要：采用高能球磨结合放电等离子烧结技术(SPS)制备了纳米晶Cu-Al合金,进而通过去合金化法获得纳米多孔铜块体材料。研究了合金成分对纳米晶Cu-Al前驱体物相演变、去合金化处理获得的纳米多孔铜微观结构和力学性能的影响。结果表明,当合金中铜含量较低时,纳米晶Cu-Al前驱体由α-Al固溶体和Al_2Cu两相组成;随着铜含量的增加,前驱体中α-Al固溶体相逐渐减少,Al_2Cu相逐渐增加;当铜含量增加到32%时,纳米晶Cu-Al前驱体中仅有Al_2Cu单相。此外,随着铜含量的增加,纳米晶Cu-Al前驱体去合金化处理后,其纳米多孔铜微观结构由微米/纳米双级复合孔逐渐转变为孔径均匀的三维连通纳米孔,并且纳米多孔铜块材的压缩强度逐渐增大。Bulk nanoporous copper （BNPC） with different morphology was synthesized through chemical deal-loying of nanocrystalline A1Cu alloys prepared by mechanical alloying combining with spark plasma sintering.The effect of the composition on phases of precursor alloys, as well as microstructure and mechanical propertiesof BNPC, was investigated. The results show that when the proportion of copper in alloys is low, the alloyscomprise of α-Al and Al-Cu phase. However, with the increase of copper, the contents of α-Al decrease and fi-nally the precursor alloy which simply contains Al2Cu phase can be formed. After dealloying, we found the hi-modal pore structures gradually become uniform and interconnected because of the increase of copper. Moreo-ver, uniaxial compression tests of bulk nanoporous copper were investigated. With the increase of Cu atom frac-tion in precursor alloy, the compression properties of bulk samples improved dramatically.

关 键 词：纳米晶 SPS 纳米多孔铜块材 宏观力学性能 

分 类 号：TB383[一般工业技术—材料科学与工程] TF125[冶金工程—粉末冶金]