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Residual Stresses in Bulk Metallic Glasses due to Differential Cooling or Thermal Tempering

Published online by Cambridge University Press:  10 February 2011

E. Ustundag ,
B. Clausen ,
J. C. Hanan ,
M. A. M. Bourke ,
A. Winholtz  and
A. Pekers
E. Ustundag
Affiliation:
California Institute of Technology, Department of Materials Science, M/C 138-78, Pasadena, CA 91125, ustundag@hyperfine.caltech.edu
B. Clausen
Affiliation:
Los Alamos National Laboratory, LANSCE, MS H805, Los Alamos, NM 87545
J. C. Hanan
Affiliation:
California Institute of Technology, Department of Materials Science, M/C 138-78, Pasadena, CA 91125, ustundag@hyperfine.caltech.edu
M. A. M. Bourke
Affiliation:
Los Alamos National Laboratory, LANSCE, MS H805, Los Alamos, NM 87545
A. Winholtz
Affiliation:
Research Reactor Center, Research Park, University of Missouri, Columbia, MO 65211
A. Pekers
Affiliation:
California Institute of Technology, Department of Materials Science, M/C 138-78, Pasadena, CA 91125, ustundag@hyperfine.caltech.edu Amorphous Technologies, 27722 El Lazo, Laguna Niguel, CA 92677
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Abstract

Due to their very low thermal conductivities and large thermal expansion values, bulk metallic glasses (BMGs) undergo differential cooling during processing. Large thermal gradients are generated across a specimen leading to residual stress buildup. A thin surface layer contains compressive stresses balanced by tension in the middle. Such stresses can not only influence the mechanical behavior of BMGs, but they can also lead to problems during manufacturing of large or intricate components. Analytical and finite element modeling was used to predict the values and distribution of such stresses as a function of processing conditions. Neutron diffraction measurements were then performed on model specimens which included crystalline phases as “strain gages”. It was shown that significant stresses, on the order of several hundred MPa, can be generated in BMGs. Modeling and diffraction results are presented and their implications discussed.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 554: Symposium MM – Bulk Metallic Glasses , 1998 , 431
Copyright
Copyright © Materials Research Society 1999

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