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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 ,
Ying Liu ,
Lixian Lian ,
Xuezhe Zhou  and
Lin He
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: lianlixian@scu.edu.cn
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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.”

Type
Articles
Information
Journal of Materials Research , Volume 27 , Issue 21 , 14 November 2012 , pp. 2771 - 2778
Copyright
Copyright © Materials Research Society 2012

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