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Structure analysis of precursor alloy and diffusion during dealloying of Ag–Al alloy

机译:前驱体合金的结构分析及银铝合金脱合金过程中的扩散

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Nanoporous silver (NPS) was fabricated by dealloying Ag–Al alloy ribbons with nominal compositions of 30, 35 and 40 at% Ag (corresponding to hypoeutectic composition, eutectic composition and hypereutectic composition, respectively). The microstructures of the Ag–Al precursor and as-dealloyed samples were observed using a scanning electron microscope (SEM) and a transmission electron microscope (TEM) as well as via focused ion beam (FIB) technique. We concluded that with the increase in Ag content from 30 to 40 at%, the diameter of ligament increased from 70 ± 15 nm to 115 ± 35 nm. Due to the method of crystalline solidification and the distribution of α-Al(Ag) and γ-Ag _(2) Al phases, the as-dealloyed Ag _(35) Al _(65) alloy exhibited a homogeneous ligament/pore structure, whereas the microstructures of Ag _(30) Al _(70) and Ag _(40) Al _(60) showed thinner and coarser ligament structures, respectively.
机译:纳米多孔银(NPS)是通过脱银Ag-Al合金带制成的,其标称成分为30、35和40 at%Ag(分别对应于亚共晶成分,低共熔成分和过共晶成分)。使用扫描电子显微镜(SEM)和透射电子显微镜(TEM)以及通过聚焦离子束(FIB)技术观察了Ag-Al前驱体和脱合金样品的微观结构。我们得出的结论是,随着Ag含量从30 at%增加到40 at%,韧带的直径从70±15 nm增加到115±35 nm。由于采用了晶体凝固方法以及α-Al(Ag)和γ-Ag_(2)Al相的分布,因此,经过脱合金处理的Ag _(35)Al _(65)合金呈现出均匀的韧带/孔结构,而Ag _(30)Al _(70)和Ag _(40)Al _(60)的显微组织分别显示出较薄和较粗的韧带结构。

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