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Open AccessArticle

Fabrication of a Porous Metal via Selective Phase Dissolution in Al-Cu Alloys

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Department of Mechanical Engineering, University of Puerto Rico-Mayagüez, Mayagüez, PR 00681, USA
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Department of Chemical Engineering, University of Puerto Rico-Mayagüez, Mayagüez, PR 00681, USA
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Department of Engineering Science and Materials, University of Puerto Rico-Mayagüez, Mayagüez, PR 00681, USA
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Department of Chemistry, University of Puerto Rico-Mayagüez, Mayagüez, PR 00681, USA
*
Author to whom correspondence should be addressed.
Metals 2018, 8(6), 378; https://doi.org/10.3390/met8060378
Received: 16 April 2018 / Revised: 17 May 2018 / Accepted: 21 May 2018 / Published: 24 May 2018
(This article belongs to the Special Issue Nanoporous Metals)
Through free corrosion, a new low cost porous material was successfully fabricated by removing a single phase of a binary aluminum-copper alloy. This selective phase dissolution was carried out an Al-Al2Cu eutectic alloy of the Al-Cu binary system and additionally for two hypereutectic compositions. The porosity of the material depends on the microstructure formed upon solidification. For this reason, several solidification methods were studied to define the most convenient in terms of uniformity and refinement of the average pore and ligament sizes. The samples were corroded in a 10% v/v NaOH aqueous solution, which demonstrated to be the most convenient in terms of time involved and resulting porosity conditions after the corrosion process. The porosity was measured through analysis of secondary electron images. The effectiveness of the process was verified using X-ray diffraction, which showed that, under the proposed methodology, there was complete removal of one of the phases, namely the aluminum one. View Full-Text
Keywords: selective dissolution; Al-Cu alloys; NaOH; free corrosion; porous metal selective dissolution; Al-Cu alloys; NaOH; free corrosion; porous metal
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MDPI and ACS Style

Vargas-Martínez, J.; Estela-García, J.E.; Suárez, O.M.; Vega, C.A. Fabrication of a Porous Metal via Selective Phase Dissolution in Al-Cu Alloys. Metals 2018, 8, 378.

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