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

A Study on the Methodology of the Plasticity Enhancement of Amorphous Alloys

비정질 합금의 소성 증가 방법에 대한 연구

  • 박경원 (고려대학교 신소재공학과) ;
  • 이창면 (고려대학교 신소재공학과) ;
  • 이광복 (고려대학교 신소재공학과) ;
  • 이재철 (고려대학교 신소재공학과)
  • Published : 2008.11.01
Download PDF
⟨ Previous Next ⟩

Abstract

This study demonstrates that preloading via the elastostatic compression imposed on amorphous alloys at room temperature induces homogeneous plastic strain associated with structural disordering. This structural disordering causes disorder, which at room temperature creates excess free volume and in turn enhances the plasticity. In this study, we investigated the effects of various parameters, such as stress level, flow rate and preloading time, on the degree of the structural disordering at room temperature. On the basis of the present findings, we proposed a method of enhancing the plasticity of amorphous alloys.

Keywords

References

  1. K. H. Kim, S. W. Lee, J. P. Ahn, E. Fleury, Y. C. Kim, J. C. Lee, 2007, A Cu-based Amorphous Alloy with a Simultaneous Improvement in Its Glass Forming Ability and Plasticity, Met. Mater. Inter., Vol. 13, pp. 21-25 https://doi.org/10.1007/BF03027818
  2. S. C. Lee, M. Y. Huh, H. J. Kim, J. C. Lee, 2008, Extraordinary plasticity of an amorphous alloy based on atomistic-scale phase separation, Mater. Sci. Eng. A, Vol. 485, pp. 61-65 https://doi.org/10.1016/j.msea.2007.08.068
  3. J. C. Oh, T. Ohkubo, Y. C. Kim, E. Fleury, K. Hono, 2005, Phase separation in $Cu_{43}Zr_{43}Al_7Ag_7$ bulk metallic glass, Scripta Mater., Vol. 53, pp. 165-169 https://doi.org/10.1016/j.scriptamat.2005.03.046
  4. S. W. Lee, S. C. Lee, Y. C. Kim, E. Fleury, J. C. Lee, 2007, Design of a bulk amorphous alloy containing Cu-Zr with simultaneous improvement in glassforming ability and plasticity, J. Mater. Res., Vol. 22, pp. 486-492 https://doi.org/10.1557/jmr.2007.0063
  5. J. S. Park, H. K. Lim, J. H. Kim, H. J. Chang, W. T. Kim, D. H. Kim, E. Fleury, 2005, In situ crystallization and enhanced mechanical properties of the $Zr_{41.2}Ti_{13.8}Cu_{12.5}Ni_{10}Be_{22.5}$ alloy by cold rolling, J. Non-Cryst. Solids, Vol. 351, pp. 2142-2146 https://doi.org/10.1016/j.jnoncrysol.2005.04.070
  6. Y. Yokoyama, 2003, Ductility improvement of Zr-Cu-Ni-Al glassy alloy, J. Non-Cryst. Solids, Vol. 316, pp. 104-113 https://doi.org/10.1016/S0022-3093(02)01942-7
  7. Q. P. Cao, J. F. Li, Y. H. Zhou, A. Horsewell, J. Z. Jiang, 2006, Effect of rolling deformation on the microstructure of bulk $Cu_{60}Zr_{20}Ti_{20}$ metallic glass and its crystallization, Acta Mater., Vol. 54, pp. 4373-4383 https://doi.org/10.1016/j.actamat.2006.05.030
  8. C. M. Lee, S. C. Lee, S. Y. Shin, N. J. Kim, J. C. Lee, 2008, Improvement of the plasticity of bulk amorphous alloys via a low-angle shear-deforming process, Mater. Sci. Eng. A, Vol. 487, pp. 400-404 https://doi.org/10.1016/j.msea.2007.11.058
  9. I. Skorvanek, R. Gerling, T. Graf, M. Fricke, J. Hesse, 1994, Neutron Irradiation Effects on the Structural, Magnetic and Mechanical Properties of Amorphous and Nanocrystalline $Fe_{73.5}Cu_1Nb_3Si_{13.5}B_9,$ IEEE Trans. Magn., Vol. 30, pp. 548-551 https://doi.org/10.1109/20.312332
  10. J. C. Lee, K. W. Park, K. H. Kim, E. Fleury, B. J. Lee, M. Wakeda, Y. Shibutani, 2007, Origin of the plasticity in bulk amorphous alloys, J. Mater. Res., Vol. 22, pp. 3087-3097 https://doi.org/10.1557/jmr.2007.0382
  11. K. W. Park, J. I. Jang, M. Wakeda, Y. Shibutani, J. C. Lee, 2007, Atomic packing density and its influence on the properties of Cu-Zr amorphous alloys, Scripta Mater., Vol. 57, pp. 805-808 https://doi.org/10.1016/j.scriptamat.2007.07.019
  12. S. J. Lee , B. G. Yoo , J. I. Jang , J. C. Lee, 2008, Irreversible Structural Change Induced by Elastostatic Stress imposed on an Amorphous Alloy and Its Influence on the Mechanical Properties, Met. Mater. Inter., Vol. 14, pp. 9-14 https://doi.org/10.3365/met.mat.2008.02.009
  13. A. Van den Beukel, J Sietsma, 1990, The glass transition as a free volume related kinetic phenomenon, Acta Mater., Vol. 38, pp. 383-389 https://doi.org/10.1016/0956-7151(90)90142-4
  14. Bhowmick, R. Raghavan, K. Chattopadhyay, U. Ramamurty, 2006, Plastic flow softening in a bulk metallic glass, Acta Mater. Vol. 54, pp. 4221-4228 https://doi.org/10.1016/j.actamat.2006.05.011
  15. Q. K. Li, M. Li, 2006, Atomic scale characterization of shear bands in an amorphous metal, Appl. Phys. Lett., Vol. 88, pp. 241903 https://doi.org/10.1063/1.2212059