Fabrication and mechanical behavior of bulk nanoporous Cu via chemical de-alloying of Cu-Al alloys

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• 作者：Fei Chen^a ; ^{chenfei027@gmail.com" class="auth_mail" title="E-mail the corresponding author} ; Xi Chen^a ; Lijie Zou^a ; Yao Yao^a ; Yaojun Lin^a ; Qiang Shen^a ; Enrique J. Lavernia^b ; Lianmeng Zhang^a ; ^{lmzhang@whut.edu.cn" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Nanoporous Cu ; Cu&ndash ; Al alloys ; Chemical de-alloying ; Compressive strength
• 刊名：Materials Science & Engineering A
• 出版年：2016
• 出版时间：13 April 2016
• 年：2016
• 卷：660
• 期：Complete
• 页码：241-250
• 全文大小：5776 K

文摘

We report on a study of the influence of microstructure on the mechanical behavior of bulk nanoporous Cu fabricated by chemical de-alloying of Cu₅₀Al₅₀, Cu₄₀Al₆₀, Cu₃₃Al₆₇ and Cu₃₀Al₇₀ (at%) alloys. The precursor Cu–Al alloys were fabricated using arc melting and bulk nanoporous Cu was obtained by subsequent de-alloying of Cu–Al alloys in 20 wt% NaOH aqueous solution at a temperature of 65 °C. We studied the microstructure of the precursor Cu–Al alloys, as well as that of the as de-alloyed bulk nanoporous Cu, using X-ray diffraction, scanning electron microscopy and energy dispersive spectrometry. Moreover, the compressive strength of bulk nanoporous Cu was measured and the relationship between microstructure and mechanical properties was studied. Our results show that the microstructure of bulk nanoporous Cu is characterized by bi-continuous interpenetrating ligament-channels with a ligament size of 130±20 nm (for Cu₅₀Al₅₀), 170±20 nm (for Cu₄₀Al₆₀) and 160±10 nm (for Cu₃₃Al₆₇). Interestingly the microstructure of de-alloyed Cu₃₀Al₇₀ is bimodal with nanopores (100's nm) and interspersed featureless regions a few microns in size. The compressive strength increased with decreasing volume fraction of porosity; as porosity increased 56.3±2% to 73.9±2%, the compressive strength decreased from 17.18±1 MPa to 2.71±0.5 MPa.