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 Al2 Cu 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,Al2 Cu 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Al2 Cu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 Al-Cu 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 properties of BNPC,was investigated.The results show that when the proportion of copper in alloys is low,the alloys comprise ofα-Al and Al2 Cu phase.However,with the increase of copper,the contents ofα-Al decrease and fi-nally the precursor alloy which simply contains Al2 Cu phase can be formed.After dealloying,we found the bi-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.
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