Creation of bimodal porous copper materials by an annealing-electrochemical dealloying approach

Song, T.1; Yan, M.1,2; Shi, Z.3; Atrens, A.3; Qian, M.1

2015-05

10.1016/j.electacta.2015.02.217

ELECTROCHIMICA ACTA   影响因子和分区

0013-4686

1873-3859

Hierarchical (bimodal) porous copper (Cu) materials with micro-and nano-sized pores are desired for a wide variety of important applications. This study proposes an annealing-electrochemical dealloying approach for the creation of bulk bimodal porous Cu materials from an as-cast hypereutectic Al75Cu25 (at.%) precursor alloy, which consists of pre-eutectic CuAl2 and lamellar eutectic alpha-Al(Cu)-CuAl2. Annealing of the precursor alloy plays a critical role in the subsequent electrochemical dealloying for the creation of bimodal porous Cu. It decouples the lamellar eutectic structure and substantially increases the size of the alpha-Al(Cu) phase which determines the size of the subsequently produced micropores. In addition, it reduces the solubility of Cu in alpha-Al(Cu) and noticeably decreases the critical potential of the Al75Cu25 alloy thereby enabling more flexible electrochemical dealloying. A variety of bimodal porous Cu structures were produced using the proposed approach. The most homogeneous bimodal porous Cu structure with the average ligament width of 52 nm was produced by electrochemical dealloying of the annealed Al75Cu25 alloy at the applied potential of -0.5 V, which is above the critical potential of the alpha-Al (Cu) but below that of the CuAl2 phase. The influence of annealing on the microstructure and the subsequent electrochemical dealloying behaviours of the Al75Cu25 alloy was characterised and discussed in detail. (C) 2015 Elsevier Ltd. All rights reserved.

Annealing Dealloying Bimodal Nanoporous Microporous

SCI ; EI

英语

其他

China Scholarship Council[] ; RMIT University[]

Electrochemistry

Electrochemistry

WOS:000352499000035

PERGAMON-ELSEVIER SCIENCE LTD

20151000612427

Annealing ; Binary alloys ; Dealloying ; Eutectics ; Microporosity

Metallography:531.2 ; Heat Treatment Processes:537.1 ; Aluminum Alloys:541.2 ; Physical Properties of Gases, Liquids and Solids:931.2

CHEMISTRY

Web of Science

1.RMIT Univ, Sch Aerosp Mech & Mfg Engn, Ctr Addit Mfg, Melbourne, Vic 3001, Australia
2.South Univ Sci & Technol China, Dept Mat Sci & Engn, Shenzhen 518055, Guangdong, Peoples R China
3.Univ Queensland, Queensland Ctr Adv Mat Proc & Mfg AMPAM, Sch Mech & Min Engn, Brisbane, Qld 4072, Australia

Song, T.,Yan, M.,Shi, Z.,et al. Creation of bimodal porous copper materials by an annealing-electrochemical dealloying approach[J]. ELECTROCHIMICA ACTA,2015,164:288-296.

Song, T.,Yan, M.,Shi, Z.,Atrens, A.,&Qian, M..(2015).Creation of bimodal porous copper materials by an annealing-electrochemical dealloying approach.ELECTROCHIMICA ACTA,164,288-296.

Song, T.,et al."Creation of bimodal porous copper materials by an annealing-electrochemical dealloying approach".ELECTROCHIMICA ACTA 164(2015):288-296.