TY - JOUR
T1 - Buckling of metallic glass supercooled liquid layer during embossing
AU - Meduri, Chandra Sekhar
AU - Hu, Zhonglue
AU - Blawzdziewicz, Jerzy
AU - Kumar, Golden
N1 - Funding Information:
This work was supported by the National Science Foundation (NSF) through Award No. CMMI-1663568 and CAREER Award No. CMMI-1653938. J.B. was partially supported by NSF Award No. CBET-1603627. Microscopy characterization was performed using a Hitachi S-4300 SEM acquired through the NSF Major Research Instrumentation Program Award No. #0421032.
Publisher Copyright:
© 2019 Author(s).
PY - 2019/3/18
Y1 - 2019/3/18
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=85063223300&partnerID=8YFLogxK
U2 - 10.1063/1.5091721
DO - 10.1063/1.5091721
M3 - Article
AN - SCOPUS:85063223300
VL - 114
JO - Applied Physics Letters
JF - Applied Physics Letters
SN - 0003-6951
IS - 11
M1 - 113102
ER -