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Precursors of amorphization in supersaturated Nb-Pd solid solutions

Published online by Cambridge University Press:  03 March 2011

C.E. Krill III,
J. Li,
C.M. Garland,
C. Ettl,
K. Samwer,
W.B. Yelon and
W.L. Johnson
C.E. Krill III*
Affiliation:
W.M. Keck Laboratory of Engineering Materials 138–78, California Institute of Technology, Pasadena, California 91125
J. Li
Affiliation:
W.M. Keck Laboratory of Engineering Materials 138–78, California Institute of Technology, Pasadena, California 91125
C.M. Garland
Affiliation:
W.M. Keck Laboratory of Engineering Materials 138–78, California Institute of Technology, Pasadena, California 91125
C. Ettl
Affiliation:
Institut für Physik, Universität Augsburg, D-86135 Augsburg, Germany
K. Samwer
Affiliation:
Institut für Physik, Universität Augsburg, D-86135 Augsburg, Germany
W.B. Yelon
Affiliation:
University of Missouri Research Reactor, Columbia, Missouri 65211
W.L. Johnson
Affiliation:
W.M. Keck Laboratory of Engineering Materials 138–78, California Institute of Technology, Pasadena, California 91125
*
a)Present address: Universität des Saarlandes, FB 15 Werkstoff-wissenschaften, Postfach 151150, Gebäude 43, D-66041 Saarbrücken, Germany.
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Abstract

The possibility that crystal-to-amorphous phase transformations can be induced by one or more underlying instabilities of the crystalline phase has been investigated in highly supersaturated solid solutions of Nb-Pd. Several unusual properties were discovered that may be identified as precursor effects of the collapse of the bcc α-Nb terminal solution to the amorphous phase. Elastic neutron diffraction measurements of α-Nb solutions found, with increasing Pd concentration, an anomalously large increase of the average atomic root-mean-square displacement to about half of the value at which the Lindemann criterion predicts the lattice should melt. Low-temperature heat capacity measurements yielded a concomitant decrease in the Debye temperature, suggesting that supersaturation causes an elastic modulus to soften. Single crystals of α-Nb solutions at high supersaturations have a highly anisotropic structure that is visible in transmission electron microscopy images; it is consistent with the development of a soft phonon mode leading to a bcc-to-ω phase transformation. Considered together with the results of other recent experiments, these findings suggest that shear instability of the crystalline phase plays an important role in the crystal-to-amorphous transformation and that the average static mean-square displacement of atoms in the lattice acts as a useful parameter for the stability of the crystal with respect to amorphization.

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Journal of Materials Research , Volume 10 , Issue 2 , February 1995, pp. 280 - 291
Copyright
Copyright © Materials Research Society 1995

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