Transactions of Materials Processing (소성∙가공)

The Korean Society for Technology of Plasticity and materials processing (한국소성∙가공학회)
권호 표지
DOI QR코드

DOI QR Code

Deformation Behavior of Bulk Amorphous Alloys During Hot Forming Process

열간성형공정에서 벌크 아몰퍼스 소재의 변형거동

  • 이용신 (국민대학교 기계자동차공학부)
  • Published : 2004.12.01
Download PDF
⟨ Previous Next ⟩

Abstract

The purpose of this study is to examine the bulk/sheet forming characteristics of bulk amorphous alloys in the super cooled liquid state. Recently it is reported that amorphous alloys exhibit stress overshoot/undershoot and non-Newtonian behaviors even in the super cooled liquid state. The stress-strain curves with the temperature-dependences as well as strain-rate dependence of Newtonian/non-Newtonian viscosities of amorphous alloys are obtained based on the previous experimental works. Then, those curves are directly used in the thermo-mechanical finite element analyses. Upsetting and deep drawing of amorphous alloys are simulated to examine the effects of process parameters such as friction coefficient, forming speed and temperature. It could be concluded that the superior formability of an amorphous alloy can be obtained by taking the proper forming conditions.

Keywords

References

  1. Y. Saotome, A. Itoh, S. Amada, 1993, 'Superplastic Micro Forming of Double Gear for Milli-machines', advanced Technology of Plasticity, Proceeding of the Fouth International Conference on Technology of Plasticity
  2. Y. Saotome, H. Iwazaki, 2000, Microsystem technologies, Vol. 6, pp. 126-129 https://doi.org/10.1007/s005420050180
  3. Y. Saotome, 1977 'Microforming and Fabrication of Micromachines with Amorphous Alloys', Proc. The 3rd Int. Micromachine Symposium
  4. Y. Saotome, A. Inoue, 2000, 'New Amorphous Alloys as Micro materials and Processing Technol-ogy', The 13th Annual Int.Conf. on Micro Electro Mechanical Systems, pp. 288-292
  5. A. Inoue, 2000, 'Stabilization of Metallic Super- cooled Liquid and Bulk Amorphous Alloys', Acta mater. Vol 48, pp.279-306 https://doi.org/10.1016/S1359-6454(99)00300-6
  6. Ho-Sou Chen, H. Kato, A. Inoue, 2000,' A Ficitve Stress Model Calculation of Stress Overshoot', The Japan Society of Applied Physics, Vol. 39, pp.1808-1811 https://doi.org/10.1143/JJAP.39.1808
  7. Y. Kawamura, T. Shibata, A. Inoue and T. Masum-oto, 1977, Scripta Materialia, Vol. 37, No.4, pp. 431-436 https://doi.org/10.1016/S1359-6462(97)00105-X
  8. M. L. Vaillant, V. Keryvin, T. Rouxel, Y. Kawa-mura, 2002, Scripta Materialia, Vol. 47, pp. 19-23 https://doi.org/10.1016/S1359-6462(02)00091-X
  9. William L. Johnson, 1996, 'Bulk Metallic Glasses a New Engineering Material', Current Opinion in Solid State & Materials Science
  10. J. F. Loffler, W. Johnson, 2001, 'Crystallization Pathways of Deeply Undercooled Zr-Ti-Cu-Ni-Be Melts', Scripta mater., Vol 44, pp. 1251-1255 https://doi.org/10.1016/S1359-6462(01)00693-5