Strain development in nanoporous metallic foils formed by dealloying
Strain development in nanoporous metallic foils formed by dealloying
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DOI：
10.1063/1.2838351
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发表时间：
2008-01
影响因子：
4
通讯作者：
E. Schofield;B. Ingham;A. Turnbull;M. Toney;M. Ryan
中科院分区：
文献类型：
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作者：
E. Schofield;B. Ingham;A. Turnbull;M. Toney;M. Ryan
通过在浓硝酸中脱合金银合金制备了纳米多孔金箔。用同步加速器衍射仪研究了具有相互连接的韧带的“海绵状”形态的产物箔。通过小角实验实现了纳米结构的三维可视化，并通过衍射法得到了晶格参数。数据显示了材料中两个散布的纳米级应变区的发展：一个处于显著拉伸状态，另一个处于压缩状态。我们通过考虑材料中正、负曲率较高的区域来解释这一点；该曲率随着孔径的增加而减小，从而导致晶格应变的松弛。
Nanoporous Au foils were formed by dealloying a Ag–Au alloy in concentrated HNO3. The resultant foils, which have a “spongelike” morphology with interconnecting ligaments, were studied using synchrotron-based diffraction. A three-dimensional visualization of the nanostructure is generated from small angle experiments and the lattice parameter is derived from diffraction. The data show the development of two interspersed nanoscale strained regions within the material: one in significant tension and one in compression. We interpret this by considering regions of high positive and negative curvatures in the material; this curvature decreases with increasing pore size resulting in a relaxation in lattice strain.