Nanoporous Copper Dealloyed from a Nanocrystallized Ticu Alloy
Nanoporous Copper Dealloyed from a Nanocrystallized Ticu Alloy
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DOI：
10.4028/www.scientific.net/msf.750.72
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发表时间：
2013-03
期刊：
影响因子：
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通讯作者：
Z. Dan;F. Qin;Y. Sugawara;I. Muto;N. Hara
中科院分区：
文献类型：
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作者：
Z. Dan;F. Qin;Y. Sugawara;I. Muto;N. Hara
在25 °C的HF溶液中，通过对Ti下标text 50 Cu 50薄带合金进行纳米晶化处理，制备了纳米多孔铜（NPC）。在T = 400 °C热处理过程中，Ti 3Cu 4与Ti 2Cu共沉淀，形成了多峰纳米多孔结构（Italic textT下标textg Italic textT下标textx）。在初始材料中，多相的存在导致了纳米孔隙演化的不同行为。在0.03 mol/L HF溶液中，在不同组分区域得到了孔径为54 nm和184 nm的双峰纳米多孔铜。两个区域的韧带鳞片长度分别为54 nm和203 nm。在0.13 mol/L HF溶液中，孔径和相分离的差异变小，并伴随着大孔和小韧带的演化。通过XRD和TEM选区衍射图中Cu（111）、（200）、（220）和（311）的存在，证实脱合金后的残留物为fcc Cu。用于去合金化的起始材料的微观结构，例如金属间相，在最终的多峰纳米多孔结构的形成中起关键作用。
Nanoporous copper (NPC) was fabricated through dealloying nanocrystallized TiSubscript text50Cu50 ribbon alloy under a free immersion condition in HF solutioSubscript textns at 25 °C. Multimodal nanoporous structure was formed due to the presence of Ti3Cu4 phase, which was co-precipitated with Ti2Cu during the heat treatment at T = 400 °C (Italic textTSubscript textg Italic textT Subscript textx). The presence of multiphases in tItalic texthe starting material caused the different behavior in the evolution of nanoporosity. In 0.03 mol/L HF solution, the bimodal nanoporous copper with a pore size of 54 nm and 184 nm was obtained in different regions where the composition differed. The ligament scale lengths in two regions were confirmed to be 54 nm and 203 nm, respectively. In 0.13 mol/L HF solution, the difference in the pore size and phase separation became weak, accompanying with the evolution of larger pores and smaller ligaments. The residue after dealloying was confirmed to be fcc Cu, indicated by the presence of Cu (111), (200), (220) and (311) in XRD patterns and TEM selective area diffraction pattern. The microstructure of the starting materials for dealloying, such as intermetallic phases, played a key role in the formation of the final multimodal nanoporous structure.