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TEM Studies of Shear Bands in a Bulk Metallic Glass Based Composite

Published online by Cambridge University Press:  02 July 2020

E. Pekarskaya ,
C.P. Kim  and
W.L. Johnson
E. Pekarskaya
Affiliation:
Keck Laboratory of Engineering Materials, California Institute of Technology, Pasadena, CA, 91125, USA
C.P. Kim
Affiliation:
Keck Laboratory of Engineering Materials, California Institute of Technology, Pasadena, CA, 91125, USA
W.L. Johnson
Affiliation:
Keck Laboratory of Engineering Materials, California Institute of Technology, Pasadena, CA, 91125, USA
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Abstract

In 1980’s the discovery of multicomponent systems with exceptional glass forming ability enabled the synthesis of metallic glasses at relatively low cooling rates, 10−1 — 102 K/s and at a larger thicknesses. Bulk metallic glasses normally have very high yield stress, σy = 0.02 · Y (Y is Young’s modulus), high elastic limit of about 2%, but fail with very little global plasticity, typically along a localized shear band at a 45 degree angle with respect to the applied stress.

The material studied in the present work is a two-phase Zr56.3Ti13.8Cu6.9Ni5.6Nb5.0Be12.5 alloy,prepared by in-situ processing. The alloy consists of amorphous and crystalline phases. In-situ TEM straining (tensile) experiments were performed at room temperature in JEOL 4000EX operating at 300kV. The experiments were carried out in the Center for Microanalysis of Materials in the University of Illinois at Urbana-Champaign. The goal of the study was to understand the deformation mechanisms of such composite material.

Type
Advanced Composites
Information
Microscopy and Microanalysis , Volume 7 , Issue S2: Proceedings: Microscopy & Microanalysis 2001, Microscopy Society of America 59th Annual Meeting, Microbeam Analysis Society 35th Annual Meeting, Long Beach, California August 5-9, 2001 , August 2001 , pp. 1120 - 1121
Copyright
Copyright © Microscopy Society of America 2001

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References

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