Relationship between the heat flow and relaxation of the shear modulus in bulk PdCuP metallic glass

•We studied unusual PdCuP glass, whose density decreases upon crystallization.•We found that heat effects are uniquely linked to shear modulus relaxation.•Equations describing this relationship are discussed.•There is an intrinsic connection between the shear moduli of glass and crystal. We measured...

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Bibliographic Details
Published in:Journal of alloys and compounds 2015-01, Vol.618, p.449-454
Main Authors: Tsyplakov, A.N., Mitrofanov, Yu.P., Khonik, V.A., Kobelev, N.P., Kaloyan, A.A.
Format: Article
Language:English
Subjects:
Calorimetry
Elasticity
Metallic glasses
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Summary:•We studied unusual PdCuP glass, whose density decreases upon crystallization.•We found that heat effects are uniquely linked to shear modulus relaxation.•Equations describing this relationship are discussed.•There is an intrinsic connection between the shear moduli of glass and crystal. We measured the heat flow, shear modulus and density changes occurring upon heating of bulk glassy Pd41.25Cu41.25P17.5, which polymorphically crystallizes into tetragonal Pd2Cu2P with simultaneous decrease of the density. It was found that the heat release (well below the glass transition temperature Tg) and heat absorption (near and above Tg) are uniquely linked to the relaxation of the shear modulus through the relaxation change of the concentration of internal “defects” frozen-in upon glass production. The two models suitable for a quantitative description of this interrelationship are discussed in detail. The obtained results clearly demonstrate an intrinsic connection of the shear moduli of glass and maternal crystal.
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2014.08.198