Porous metal micro-pillars by thermomechanical molding of two-phase alloys
Porous metal micro-pillars by thermomechanical molding of two-phase alloys
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DOI：
10.1016/j.jallcom.2023.170701
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发表时间：
2023-05
影响因子：
6.2
通讯作者：
S. H. Jagdale;G. Kumar
中科院分区：
文献类型：
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作者：
S. H. Jagdale;G. Kumar
结晶金属的基于蠕变的热机械成型已经成为金属纳米结构的低成本制造技术。在这里，我们展示了这种成型方法在制造多孔金属微结构中的潜力，通过使用二元合金，如Au-Si和Al-Cu。两相合金等温模塑对微尺度模板，然后通过选择性蚀刻的相之一，导致在多孔微柱。微柱的孔隙率通过改变合金成分的相分数而变化。扫描电子显微镜用于了解两相金属合金成型和蚀刻过程的不同阶段。虽然类似合金的纳米级热机械成型已被归因于扩散蠕变，这里提出的微尺度形成是由位错和晶界介导的变形机制。成型和选择性蚀刻方法可以潜在地用于通过优化原料合金的微观结构来定制孔隙的尺寸和分布。
Creep-based thermomechanical molding of crystalline metals has emerged as a low-cost manufacturing technique for metal nanostructures. Here, we demonstrate the potential of such molding approach in fabrication of porous metal microstructures by using binary alloys such as Au-Si and Al-Cu. Two-phase alloys were isothermally molded against microscale templates followed by selective etching of one of the phases resulting in porous micro-pillars. The porosity of micro-pillars was varied by changing the phase fractions through alloy composition. Scanning electron microscopy is used to understand the different stages of molding and etching processes for two-phase metal alloys. While the nanoscale thermomechanical molding of similar alloys has been attributed to diffusional creep, the microscale forming presented here is dominated by the dislocation and grain boundary mediated deformation mechanisms. The molding and selective etching methodology can be potentially used to tailor the size and the distribution of pores by optimizing the microstructure of feedstock alloy.