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Localized Shear Deformation and Fracture in a Zr-Based Bulk Metallic Glass

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Abstract:

Behaviors of fracture and deformation in a Zr-Al-Ni-Cu bulk metallic glass(BMG) was investigated by using three-point bending tests. Apparent fracture toughness obtained by bending test was 40MPam1/2 which is comparable to the value of ductile crystalline metals. This high toughness of the BMG should be understood by the crack-tip plasticity as well as crystalline metals. It is well known that plastic deformation occurs very inhomogeneously when BMGs are deformed at room temperature. Such inhomogeneity is manifested by the appearance of surface steps caused by localized shear deformation. In the present study, the surface steps due to the localized shear bands near a fracture surface have been examined in detail by using SEM and AFM, where much attention has been paid on the variation of the surface step height measured along the localized shear band. The variation of the step height indicates the gradient of plastic shear deformation, and it can be understood, in principle, as the introduction of elastic singularities corresponding dislocations in the case of crystalline materials.

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Periodical:

Materials Science Forum (Volumes 539-543)

Pages:

2094-2099

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.539-543.2094

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Online since:

March 2007

Authors:

Tatsuya Morikawa, Tetsuro Kawada, Kenji Higashida

Keywords:

Atomic Force Microscope (AFM), Bend Test, Strain Gradient Plasticity, TEM

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© 2007 Trans Tech Publications Ltd. All Rights Reserved

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References

[1] J.F. Loffler: Intermetallics, Vol. 11(2003), p.529.

Google Scholar

[2] C.J. Gilbert, R.O. Ritchie and W.L. Johnson: Appl. Phys. Let., Vol. 71(1997), p.476.

Google Scholar

[3] R.D. Conner, A.J. Rosakis, W.L. Johnson and D.M. Owen: Scr. Mater., Vol. 37(1997), p.1373.

Google Scholar

[4] K.M. Flores and R.H. Dauskardt: Scr. Mater., Vol. 41(1999), p.937.

Google Scholar

[5] I. -H. Lin and R. Thomson: Acta Metall., Vol. 34(1986), p.187.

Google Scholar

[6] K. Higashida, N. Narita, K. Matsunaga, R. Onodera: Phys. Stat. Sol. (a), Vol. 149 (1995), p.429.

Google Scholar

[7] K. Higashida and N. Narita: Mater. Trans., Vol. 42(2001), p.33.

Google Scholar

[8] T.C. Hufnagel, P. El-Deiry and R.P. Vinci: Scr. Mater., Vol. 43(2000), p.1071.

Google Scholar

[9] J.X. Li, G.B. Shan, K.W. Gao, L.J. Qiao and W.Y. Chu: Mater. Sci. Eng., Vol. A354(2003), p.337.

Google Scholar

[10] M.F. Ashby: Phil. Mag., Vol. 21(1970), p.399.

Google Scholar

[11] N.A. Fleck, G.M. Muller, M.F. Ashby and J.W. Hutchinson: Acta Met. Mater., Vol. 42(1994), p.475.

Google Scholar

[12] T. Mukai, T.G. Nieh, Y. Kawamura, A. Inoue and K. Higashi: Scr. Mater., Vol. 46(2002), p.43.

Google Scholar

[13] G. Subhash, R.J. Dowding and L.J. Kecskes: Mater. Sci. Eng., Vol. A334(2002), p.33.

Google Scholar

[14] D. Suh and R.H. Dauskardt:J. Non-Crys. Sol., Vol. 317(2003), p.181.

Google Scholar

[15] Z.F. Zhang, J. Eckert and L. Schultz: Acta Mater., Vol. 51(2003), p.1167.

Google Scholar