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Formation of nanoporous copper through dealloying of dual-phase Cu–Mn–Al alloy: The evolution of microstructure and composition

Published online by Cambridge University Press:  03 October 2012

Ying Tang
Affiliation:
Department of Materials Science & Engineering, Sichuan University, Chengdu, 610065, People’s Republic of China
Ying Liu*
Affiliation:
Department of Materials Science & Engineering, Sichuan University, Chengdu, 610065, People’s Republic of China
Lixian Lian*
Affiliation:
Department of Materials Science & Engineering, Sichuan University, Chengdu, 610065, People’s Republic of China
Xuezhe Zhou
Affiliation:
Department of Materials Science & Engineering, Sichuan University, Chengdu, 610065, People’s Republic of China
Lin He
Affiliation:
Department of Materials Science & Engineering, Sichuan University, Chengdu, 610065, People’s Republic of China
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

A freestanding bulk nanoporous copper with ultralow density has been fabricated through dealloying of as-cast dual-phase Cu1Mn1Al8 alloy, and the dealloying behavior was investigated systematically. The experimental results show that due to different electrochemical activities, the Al11Cu5Mn3 phase of the dual-phase precursor alloy dissolved before AlCu2Mn, which corresponds to the dramatical evolutions of microstructure and composition. Additionally, a formation pattern based upon a mechanism combined “dissolution–redeposition” pattern, “phase-separation” pattern, and “coarsening” process has been built to describe the evolution process, which includes four stages, sequentially defined as “dissolution of Al11Cu5Mn3,” “redeposition of Cu atoms,” “dealloying of AlCu2Mn,” and “coarsening.”

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Articles
Copyright
Copyright © Materials Research Society 2012

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References

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