Synthesis and characterization of the dealloyed hierarchical structure of AlSi10Mg-Cu alloys prepared using laser-powder bed fusion

S Sun, C F Zhang, W Y Wang, A Godfrey
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Abstract

Nanoporous structures with high surface area can be obtained by 3D printing of lattice structures and subsequent dealloying, with potential applications in the field of catalysis and batteries. Here we prepared a AlSi10Mg-Cu (38wt%) alloy by laser-powder bed fusion of mixed powders. A metastable structure was obtained after 3D printing, with significant differences in solidification structures in different regions. The solidification structure is inherited after dealloying, in which dendrites form submicron ligaments, and nanoscale ligaments are formed inside the dendrites. Dealloying of a 3D-printed lattice structure allows the preparation of hierarchical nanoporous copper with only limited crack formation.
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利用激光粉末床熔融技术制备的 AlSi10Mg-Cu 合金的脱合金分层结构的合成与表征
通过三维打印晶格结构并随后进行脱合金处理,可以获得具有高比表面积的纳米多孔结构,并有望应用于催化和电池领域。在此,我们采用激光粉末床熔融混合粉末的方法制备了一种 AlSi10Mg-Cu (38wt%) 合金。三维打印后获得了一种可移动结构,不同区域的凝固结构存在显著差异。脱合金后,凝固结构得以继承,其中树枝状突起形成亚微米级韧带,树枝状突起内部形成纳米级韧带。通过对三维打印的晶格结构进行脱合金处理,可以制备出只形成有限裂纹的分层纳米多孔铜。
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