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HomeMaterials Science ForumMaterials Science Forum Vols. 706-709Structural Changes of Liquid Pb-Bi Eutectic Alloy

Structural Changes of Liquid Pb-Bi Eutectic Alloy

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Abstract:

Liquid Pb–Bi eutectic (LBE) alloy has been selected as coolant and neutron spallation source for the development of MYRRHA, an accelerator driven system (ADS). The alloy has been characterized in liquid state from melting (125 °C) to 750 °C by mechanical spectroscopy, i.e. internal friction (IF) and dynamic modulus measurements. The experiments have been carried out using hollow reeds of austenitic stainless steel filled with Pb-Bi alloy and sealed at the extremities. Dynamic modulus showed a remarkable drop in the range 350-520 °C. In the same temperature range radial distribution functions (RDFs), determined from X-ray diffraction patterns, evidenced variations of the mean distance between the 1st nearest neighbour atoms. The phenomenon has been explained as a structural re-arrangement of atoms in the liquid metal.

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THERMEC 2011

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Periodical:

Materials Science Forum (Volumes 706-709)

Pages:

878-883

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.706-709.878

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Online since:

January 2012

Authors:

Paolo Deodati, Franco Gauzzi, Roberto Montanari, Alessandra Varone

Keywords:

Dynamic Modulus, High-Temperature X-Ray Diffraction, Internal Friction, Liquid Pb–Bi Alloy, Liquid Structure, Nuclear Reactors

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© 2012 Trans Tech Publications Ltd. All Rights Reserved

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