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Plasticity at Crack Tips in Zr-Based Bulk Metallic Glasses

Published online by Cambridge University Press:  17 March 2011

Jing Li ,
Xiaofeng Gu ,
Li-Qian Xing ,
Ken Livi  and
T. C. Hufnagel
Jing Li
Affiliation:
Department of Materials Science and Engineering, Johns Hopkins University, Baltimore, Maryland 21218, U.S.A.
Xiaofeng Gu
Affiliation:
Department of Materials Science and Engineering, Johns Hopkins University, Baltimore, Maryland 21218, U.S.A.
Li-Qian Xing
Affiliation:
Department of Materials Science and Engineering, Johns Hopkins University, Baltimore, Maryland 21218, U.S.A.
Ken Livi
Affiliation:
Department of Earth and Planetary Sciences, Johns Hopkins University, Baltimore, Maryland 21218, U.S.A.
T. C. Hufnagel
Affiliation:
Department of Materials Science and Engineering, Johns Hopkins University, Baltimore, Maryland 21218, U.S.A.
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Abstract

We have examined the structure of plastic deformation zones ahead of the tips of microcracks in Zr-based bulk metallic glass Zr57Ti5Cu20Ni8Al10. We have used an axially aligned dark field transmission electron microscopy technique, with the objective aperture placed to form images using electrons from several different areas of the diffraction patterns. We also compared Fourier transforms of the high resolution transmission electron microscopy images of deformed and undeformed regions to extract additional structural information. The plastic zones produce enhanced low-angle scattering of electrons and an apparent broadening of the amorphous halo, suggesting increased disorder and the presence of voids in the deformed zones. These results are consistent with an increased degree of atomic-scale disorder and enhanced free volume in highly deformed regions, which may provide a partial explanation of the manner in which plastic deformation occurs in metallic glasses.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 644: Symposium L – Supercooled Liquid, Bulk Glassy and Nanocrystalline State of Alloys , 2000 , L12.19
Copyright
Copyright © Materials Research Society 2001

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