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Title:Shear modulus relaxation of bulk metallic glass, Pd₄₀Ni₄₀P₂₀, near the glass temperature
Author(s):Bains, Alijeet Singh
Director of Research:Granato, A.V.
Department / Program:Physics
Subject(s):relaxing glasses
Interstitialcy Theory
shear modulus relaxation
Abstract:The non-exponential and non-linear behavior of relaxing glasses below the glass temperature, Tg, is a well known and poorly understood phenomena that is the subject of much experimental and theoretical effort. The Interstitialcy Theory, which describes glasses as perfect crystals with a few percent of interstitialcy defects, provides an atomic insight into the nature of relaxing glasses. The shear modulus, G, is uniquely sensitive to interstitialcies and provides a convenient way to monitor their changing concentrations. A non-contact EMAT technique is used to excite and detect a shear wave resonance in bulk amorphous metallic glass Pd40Ni40P20 during and after a small sudden change in temperature. A shear modulus relaxation is observed with enough precision to determine how its time constant, t , changes as the relaxation progresses. The results discriminate against models of glassy relaxation commonly found in the literature and are consistent with the Interstitialcy Theory.
Issue Date:2004
Genre:Dissertation / Thesis
Rights Information:©2004 Bains
Date Available in IDEALS:2012-06-28
Identifier in Online Catalog:Q. 541.0421 B161s
FILM 2004 B161

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