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HomeJournal of Metastable and Nanocrystalline...Journal of Metastable and Nanocrystalline...On the Electromechanical Engraving of Bulk...

On the Electromechanical Engraving of Bulk Metallic Glasses: Modelling and Predictive Response

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Metastable, Mechanically Alloyed and Nanocrystalline Materials 2003

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Periodical:

Journal of Metastable and Nanocrystalline Materials (Volumes 20-21)

Pages:

89-94

DOI:

https://doi.org/10.4028/www.scientific.net/JMNM.20-21.89

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Cite this paper

Online since:

July 2004

Authors:

K. Hajlaoui, Tarek Benameur, Alain Reza Yavari, Walter José Botta Filho, B. Rezgui

Keywords:

Applied Current, Bulk Metallic Glass (BMG), Electromechanical Processing, Load, Modeling, Penetration Depth

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© 2004 Trans Tech Publications Ltd. All Rights Reserved

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[1] A.R. Yavari, M.F. de Olivera, C. Kiminami, A.Inoue and W.J. Botta F, Mater. Sci. Eng A, in press.

[2] de Olivera M., Botta W.J., and Yavari A.R., J. Metastable Nanocryst. Mater.,10,1 (2001)

[3] T.Benameur, K. Hajlaoui, A. R.Yavari, A. Inoue and B. Rezgui, Mater. Trans., JIM.V. 43,10 (2002)

[4] Z.F. Zhang , J. Eckert, L. Schultz., Acta Mater .51 (2003) 1167-1179

[5] Maillet D., André A., Batsale J-C., Degiovanni A., Moyne C., « thermal quadrupoles », John Wiley et Sons Ltd, 2000.

[6] Yves JANNOT., « Transfert Thermique » 2002.

[7] Spiegel M.R., « transformée de Laplace, cours et problème », Schaum, 1990.

[8] F. Spaepen, Acta. Metall. 25, 407 (1977).

[9] A.Inoue, Materials Science Foundation Vol.4 (1998) Radius r0 (mm) Fig. 9: Electrical power evolution during the wtip penetration for a constant current I= 0.5 A Joule power per unit volume (Ω.A2 /mm 2 ) In the super-plastic regime of the BMG, the viscosity which is exponentially dependent on the temperature is the key parameter that control strain rate and hence the rapid penetration. The tip's penetration can be predicted in the following manner: by the passage of constant current I, The heat is generated directly in cross-section S (wtip/BMG). Then, temperature increases as function of time (Fig.5). At the establishment of steady state temperature, around Tg, BMG became super-plastic and the w-tip rapidly penetrates according to ( ) 2 00 )0( tertr ⋅⋅= e& where )0(0r is the initial contact radius, e& is the strain rate given by ( )T App h s e =& and e is the average