Shear modulus relaxation of bulk metallic glass, Pd₄₀Ni₄₀P₂₀, near the glass temperature

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.

Name thesis:degree_name

Ph.D.

Level thesis:degree_level

Dissertation

Discipline thesis:degree_discipline

Physics

Year dc:date

2012

Author dc:creator

• Bains, Alijeet Singh

Contributors dc:contributor

• Granato, A.V.

• relaxing glasses
• Interstitialcy Theory
• shear modulus relaxation

Statement dc:rights

• ©2004 Bains

Language dc:language

en

Identifier

Q. 541.0421 B161s
FILM 2004 B161

OAI identifier oai:identifier

oai:www.ideals.illinois.edu:2142/32088