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Shaping of Bulk Metallic Glasses by Simultaneous Application of Electrical Current and Low Stress

  • A.R. Yavari (a1), M. F. de Oliveira (a2) and W.J. Botta (a2)

Abstract

Using the intrinsic materials properties of bulk metallic glasses (BMG), namely electrical resistivities two orders of magnitude higher than good conductors and a Newtonian viscous-flow regime of deformability, a new electromechanical process has been developed for shaping, joining and engraving of BMGs. The wider the liquid supercooled region between the glass transition temperature Tg and the crystallisation temperature Tx of the bulk metallic glass, the easier the application of the new process. In this range, the undercooled liquid deforms in a quasi-Newtonian way, allowing thermomechanical shaping in the low viscosity range as for oxide glasses. The new electromechanical processing technology has been used for economical and rapid shaping at low applied stresses by eliminating the thermal mass of the furnace and the need to heat the deformation dies. The process parameters are adaptable for the full maintenance of the glassy state or when desired, for appropriate compositions, for nanocrystallisation during the joining or shaping operation.

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Shaping of Bulk Metallic Glasses by Simultaneous Application of Electrical Current and Low Stress

  • A.R. Yavari (a1), M. F. de Oliveira (a2) and W.J. Botta (a2)

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