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Open AccessArticle

Effects of Cold Rolling and Annealing Prior to Dealloying on the Microstructure of Nanoporous Gold

by Hanyu Hui 1, Re Xia 1,2, Juying Li 3, Qingsong Mei 1,*, Ye Ma 1, Feng Chen 1 and Yan Lei 1
1
School of Power and Mechanical Engineering, Wuhan University, Wuhan 430072, China
2
Key Laboratory of Hydraulic Machinery Transients, Ministry of Education, Wuhan University, Wuhan 430072, China
3
School of Mechanical Engineering, Wuhan Polytechnic University, Wuhan 430023, China
*
Author to whom correspondence should be addressed.
Nanomaterials 2018, 8(7), 540; https://doi.org/10.3390/nano8070540
Received: 8 June 2018 / Revised: 5 July 2018 / Accepted: 10 July 2018 / Published: 18 July 2018
The properties of nanoporous gold (NPG) were known to be dependent on the microstructure of NPG. In this study, the effects of cold rolling and annealing of the original Ag0.7Au0.3 alloy on the microstructure of NPG produced by dealloying under free corrosion condition were investigated. Ag0.7Au0.3 alloy samples were cold-rolled to different strain levels/thickness reductions up to 98% and annealed at 900 °C for 3 h before dealloying. It was found that cold rolling and annealing of the original alloy can lead to reduced ligament and pore sizes of NPG. Moreover, post-deformation annealing of the original alloy was found to facilitate the formation of a homogeneous and continuous NPG structure. The minima of pore and ligament sizes (both being ~8 nm) with uniform distribution were obtained in the annealed sample with a thickness reduction of 60% for a dealloying time of 7 h. The present study indicated the significant effect of a pre-dealloying treatment of the original alloy (by plastic deformation and annealing) on the formation and optimization of the NPG microstructure produced by dealloying. View Full-Text
Keywords: nanoporous gold; microstructure; dealloying; cold rolling; annealing nanoporous gold; microstructure; dealloying; cold rolling; annealing
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MDPI and ACS Style

Hui, H.; Xia, R.; Li, J.; Mei, Q.; Ma, Y.; Chen, F.; Lei, Y. Effects of Cold Rolling and Annealing Prior to Dealloying on the Microstructure of Nanoporous Gold. Nanomaterials 2018, 8, 540.

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