Buckling of metallic glass supercooled liquid layer during embossing
Buckling of metallic glass supercooled liquid layer during embossing
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DOI：
10.1063/1.5091721
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发表时间：
2019-03
影响因子：
4
通讯作者：
C. Meduri;Zhonglue Hu;J. Blawzdziewicz;G. Kumar
中科院分区：
文献类型：
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作者：
C. Meduri;Zhonglue Hu;J. Blawzdziewicz;G. Kumar
将金属玻璃过冷液体压花到模板中是一种新兴的金属精密净成型和表面图案化技术。在这里，我们报告了金属玻璃厚度对基于模板的压花的影响。结果表明，现有的针对厚样品开发的压花理论无法描述当金属玻璃的厚度与模板腔直径相当时的过程。型腔入口处流动阻力的增加导致过冷液体发生粘性屈曲而不是填充。提出了唯象方程来描述模板空腔的厚度相关填充。基于多层粘性介质的折叠模型对屈曲现象进行了分析。我们表明，可以在金属微管的制造中利用受控屈曲，这对于许多新兴应用来说是理想的。
Embossing of metallic glass supercooled liquids into templates is emerging as a precision net-shaping and surface patterning technique for metals. Here, we report the effect of thickness of metallic glass on template-based embossing. The results show that the existing embossing theory developed for thick samples fails to describe the process when the thickness of metallic glass becomes comparable to the template cavity diameter. The increased flow resistance at the cavity entrance results in viscous buckling of supercooled liquid instead of filling. A phenomenological equation is proposed to describe the thickness dependent filling of template cavities. The buckling phenomenon is analyzed based on the folding model of multilayer viscous media. We show that controlled buckling can be harnessed in the fabrication of metal microtubes, which are desirable for many emerging applications.