Bulk diffusion regulated nanopore formation during vapor phase dealloying of a Zn-Cu alloy

被引:14
作者
Xia, Yanjie [1 ,2 ]
Lu, Zhen [3 ]
Han, Jiuhui [2 ,4 ]
Zhang, Fan [2 ]
Wei, Daixiu [5 ]
Watanabe, Kentaro [2 ]
Chen, Mingwei [6 ]
机构
[1] Xinyang Normal Univ, Collaborat Innovat Ctr Henan Prov Energy Saving B, Xinyang 464000, Peoples R China
[2] Tohoku Univ, WPI Adv Inst Mat Res, Sendai, Miyagi 9808577, Japan
[3] AIST, Math Adv Mat Open Innovat Lab, 2-1-1 Katahira,Aobaku, Sendai, Miyagi 9808577, Japan
[4] Tohoku Univ, Frontier Res Inst Interdisciplinary Sci FRIS, Sendai, Miyagi 9808578, Japan
[5] Tohoku Univ, Inst Mat Res, Sendai, Miyagi 9808577, Japan
[6] Johns Hopkins Univ, Dept Mat Sci & Engn, Baltimore, MD 21218 USA
基金
美国国家科学基金会;
关键词
Vapor phase dealloying; Dealloying kinetics; Intermediate phase; Bulk diffusion; PATTERN-FORMATION; GOLD CATALYSTS; IN-SITU; EVOLUTION; KINETICS; GROWTH; PHOSPHIDES;
D O I
10.1016/j.actamat.2022.118210
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Dealloying is a robust method for fabricating 3D bicontinuous porous materials with open porosity and large specific surface areas. The formation of nanopores usually results from two kinetically competing processes at dealloying fronts: desertion of sacrificed elements and self-assembly of lingered elements by diffusion. Since surface and interface diffusivities are usually much higher than bulk, dealloying is typically fulfilled by the fast processes while the slow bulk alloy diffusion in precursor alloys is not commonly involved into the formation of open porosity during a dealloying process. Here we report that open pore formation in a Cu12Zn88 alloy is regulated by the bulk alloy diffusion during high-temperature vapor phase dealloying. The growth of dealloyed porous microstructure is facilitated by the formation of an up-front gamma-Cu34Zn66 intermediate phase and, thereby, the dealloying kinetics is mediated by the evolution of the solid intermediate phase through bulk diffusion. The two-step dealloying process may pave a new way to tailor porous microstructure by designing and controlling intermediate phase formation. (c) 2022 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
引用
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页数:10
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