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Thermal Tempering of Bulk Metallic Glasses

Published online by Cambridge University Press:  11 February 2011

Cahit C. Aydiner  and
Ersan Üstündag
Cahit C. Aydiner
Affiliation:
Department of Materials Science, California Institute of Technology, Pasadena, CA 91125, USA
Ersan Üstündag
Affiliation:
Department of Materials Science, California Institute of Technology, Pasadena, CA 91125, USA
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Abstract

The recent development of multi-component alloys with exceptional glass forming ability has allowed the processing of large amorphous metal samples. The possibility of formation of thermal tempering stresses during the processing of these bulk metallic glass (BMG) specimens was investigated using the (1) instant freezing, and (2) viscoelastic models. Both models yielded similar results although from vastly different approaches. It was shown that fast convective cooling of Zr41.2Ti13.8Cu12.5Ni10Be22.5 plates could generate significant compressive stresses on the surfaces balanced with mid-plane tension. The crack compliance method was then employed to measure the stress profiles in a BMG plate that was cast in a copper mold. These profiles were roughly parabolic suggesting that thermal tempering was indeed the dominant residual stress generation mechanism. However, the magnitude of the measured stresses (with peak values of only about 1.5% of the yield strength) was significantly lower than the modeling predictions. Possible reasons for this discrepancy are described in relation to the actual casting process and material properties.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 754: Symposium CC – Supercooled Liquids, Glass Transition and Bulk Metallic Glasses , 2002 , CC1.9
Copyright
Copyright © Materials Research Society 2003

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References

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