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Mechanism for Light Emission During Fracture of a Zr-Ti-Cu-Ni-Be Bulk Metallic Glass: Temperature Measurements in Air and Nitrogen

Published online by Cambridge University Press:  10 February 2011

C. J. Gilbert ,
J. W. Ager ,
V. Schroeder  and
R. O. Ritchie
C. J. Gilbert
Affiliation:
Materials Sciences Division, Lawrence Berkeley National Laboratory Dept. of Materials Science & Mineral Eng., University of California, Berkeley, CA 94720–1760
J. W. Ager
Affiliation:
Materials Sciences Division, Lawrence Berkeley National Laboratory
V. Schroeder
Affiliation:
Materials Sciences Division, Lawrence Berkeley National Laboratory Dept. of Materials Science & Mineral Eng., University of California, Berkeley, CA 94720–1760
R. O. Ritchie
Affiliation:
Materials Sciences Division, Lawrence Berkeley National Laboratory Dept. of Materials Science & Mineral Eng., University of California, Berkeley, CA 94720–1760
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Abstract

Light emitted during rupture of Zr41.2Ti13.8Cu12.5 Ni10Be22.5 (at%) bulk metallic glass has been investigated. Charpy V-notch specimens fractured in a pendulum impact apparatus were used to excite light emission. Spectra acquired from rupture in air exhibited a single broad peak and were fit to a blackbody temperature of ∼3175 K. In nitrogen, however, light emission was no longer visible to the eye. In this case, the captured light was at least four orders of magnitude less intense, and spectra were shifted to the red with an effective blackbody temperature of ∼1400 K. Fracture surfaces generated in both air and nitrogen exhibited local melting, providing further evidence of intense heating during fracture. Based on these observations we argue that the intense light emission in air is associated with pyrolysis of fresh material exposed during rupture. Results were compared to preliminary observations of light emission from ribbons of a Zr57Nb5Ni12.6Cu15.4Al10 (at%) glass.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 554: Symposium MM – Bulk Metallic Glasses , 1998 , 191
Copyright
Copyright © Materials Research Society 1999

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