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A study on the micro-formability of $Zr_{62}Cu_{17}Ni_{13}Al_8$ Bulk Metallic Glasses using micro-forging and Finite Element Method applications  

Kang Sung-Gyu (울산대학교 자동차선박기술대학원)
Park Kyu-Yeol (울산대학교 기계자동차공학부)
Son Seon-Cheon (울산대학교 기계자동차공학부)
Lee Jong-Hon (한국기계연구원 첨단재료연구본부)
Na Young-Sang (한국기계연구원 첨단재료연구본부)
Publication Information
Journal of the Korean Society for Precision Engineering / v.23, no.4, 2006 , pp. 153-161 More about this Journal
Abstract
Micro-forming is a suited technology to manufacture very small metallic parts(several $mm{\sim}{\mu}m$). Micro-forming of $Zr_{62}Cu_{17}Ni_{13}Al_8$ bulk metallic glass(BMG) as a candidate material for this developing process are feasible at a relatively low stress in the supercooled liquid state without any crystallization during hot deformation. In this study, micro- formability of a representative bulk metallic glass, $Zr_{62}Cu_{17}Ni_{13}Al_8$. was investigated for micro-forging of U-shape pattern. Micro-formability was estimated by comparing $R_f$ values ($=A_f/A_g$), where $A_g$ is cross-sectional area of U groove, and $A_f$ the filled area by material. Micro-forging process was simulated and analyzed by applying finite element method. FEM simulation results showed reasonable agreement with the experimental results when the material properties and simulation conditions such as top die speed, remeshing criteria and boundary conditions were tightly controlled. The micro-formability of $Zr_{62}Cu_{17}Ni_{13}Al_8$ was increased with increasing load and time in the temperature range of the supercooled liquid state. Also, FEM simulation using a commercial software, DEFORM was confirmed to be applicable for the optimization of micro-forming process.
Keywords
Micro-forming; Micro-forging; Micro-formability; Bulk metallic glass; Finite element method;
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Times Cited By KSCI : 2  (Citation Analysis)
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