한국정밀공학회:학술대회논문집 (Proceedings of the Korean Society of Precision Engineering Conference)

한국정밀공학회 (Korean Society for Precision Engineering)
권호 표지

Zr 계 벌크비정질합금의 마이크로 단조를 이용한 미세 성형성 평가와 유한요소해석 적용에 관한 연구

A study on the micro-formability of $Zr_{62}Cu_{17}Ni_{13}Al_8$ bulk metallic glass using micro-forging and finite element method application

  • 강성규 (울산대 자동차선박기술대학원) ;
  • 나영상 (한국기계연구원 첨단재료연구본부) ;
  • 박규열 (울산대 대학원 기계자동차공학부) ;
  • 손선천 (울산대 대학원 기계자동차공학부) ;
  • 이종훈 (한국기계연구원 첨단재료연구본부)
  • Kang S.G. (Mechanical and Automotive Engineering, University Of Ulsan) ;
  • Na Y.S. (Advanced Materials Research Division, Korea Institute of Machinery and Materials) ;
  • Park K.Y. (Mechanical Eng. Dept., UOU) ;
  • Son S.C. (Mechanical Eng. Dept. UOU) ;
  • Lee J.H. (Advanced Materials Research Division, Korea Institute of Machinery and Materials)
  • 발행 : 2005.10.01
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초록

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 Ag is cross-sectional area of U groove, and $A_f$ the filled area by material. Microforging process was simulated and analyzed by applying finite element method. FEM simulation results should reasonable agreement with the experimental results when the material properties and simulation conditions such as top die speed, remeshing criteria and boundary conditions 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 DEFORM was confirmed to be applicable for the micro-forming process simulation.

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