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Published August 1, 1996 | public
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Investigation of beryllium diffusion in the supercooled liquid and glassy states of the amorphous alloy Zr_(41.2)Ti_(13.8)Cu_(12.5)Ni_(10)Be_(22.5) by high energy helium elastic backscattering

Qiu, Yuanxun
Geyer, U.
Schneider, S.
Macht, M.-P.
Johnson, W. L.
Tombrello, T. A.
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Abstract

The elastic scattering cross section for ^9Be(α, α)^9Be has been measured in a strongly resonant region from 6.00 to 6.50 MeV at a laboratory angle of 177°. This reaction has been used to investigate Be diffusion in the bulk metallic amorphous alloy Zr_(41.2)Ti_(13.8)Cu_(12.5)Ni_(10)Be_(22.5) in the solid state (SS) as well as in the supercooled liquid state (SLS). Above the glass transition, i.e., in the SLS, a remarkable increase in the diffusivity of Be (about two orders of magnitude over a 40 K temperature interval) was observed, which can be explained with a modified Arrhenius fit, which takes into account the change in configurational entropy due to the glass transition.

Additional Information

© 1996 Elsevier Science B.V. Received 9 October 1995; revised form received 12 February 1996. This work was supported in part by the National Science Foundation Grant DMR 93-1893l. by the U.S. Department of Energy Grant No. DE-FG03-86ER45242, and by the U.S. Army Research Office Grant DAAH04-95-1-0233. We gratefully acknowledge valuable assistance by A. Rice, S. Stryker and I. Dencks.

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August 19, 2023
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October 18, 2023