Physical properties of Zr sub(50)Cu sub(40 - x)Al sub(10)Pd sub(x) bulk glassy alloys

It was shown recently (Yokoyama et al. [9]) that the addition of a small amount of Pd to the Zr sub(50)Cu sub(40)Al sub(10) bulk glassy alloy (BGA) has a beneficial effect on fatigue-strength enhancement, where the composition Zr sub(50)Cu sub(37)Al sub(10)Pd sub(3) behaved in a resonant-like way by...

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Bibliographic Details
Published in:Journal of alloys and compounds 2010-08, Vol.504 (1), p.16-21
Main Authors: Wencka, M, Jagodic, M, Gradisek, A, Kocjan, A, Jaglicic, Z, McGuiness, P J, Apih, T, Yokoyama, Y, Dolinsek, J
Format: Article
Language:English
Subjects:
Alloys
BGA
Diamond pyramid hardness
Electrical resistivity
Glassy
Palladium
Physical properties
Specific heat
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Summary:It was shown recently (Yokoyama et al. [9]) that the addition of a small amount of Pd to the Zr sub(50)Cu sub(40)Al sub(10) bulk glassy alloy (BGA) has a beneficial effect on fatigue-strength enhancement, where the composition Zr sub(50)Cu sub(37)Al sub(10)Pd sub(3) behaved in a resonant-like way by showing the highest fatigue limit of 1050 MPa and the minimum Vickers hardness. We performed a study of the magnetic properties, the specific heat, the electrical resistivity and the hydrogen-diffusion constant for a series of compositions Zr sub(50)Cu sub(40 - x)Al sub(10)Pd sub(x) (x = 0-7 at.%), in order to determine their physical properties and to check for the influence of the Pd content on these properties. The Zr sub(50)Cu sub(40 - x)Al sub(10)Pd sub(x) BGAs are nonmagnetic, conducting alloys, where the Pauli spin susceptibility of the conduction electrons is the only source of paramagnetism. The low-temperature specific heat indicates an enhancement of the conduction-electron effective mass m* below 5 K, suggesting that the Zr sub(50)Cu sub(40 - x)Al sub(10)Pd sub(x) BGAs are not free-electron-like compounds. The electrical resistivities of the Zr sub(50)Cu sub(40 - x)Al sub(10)Pd sub(x) BGAs amount to about 200 k[Omega] cm and show a small, negative temperature coefficient (NTC) with an increase from 300 to 2 K of 4%. The hydrogen self-diffusion constant D in hydrogen-loaded samples shows classical over-barrier-hopping temperature dependence and is of comparable magnitude to the related icosahedral and amorphous Zr sub(69.5)Cu sub(12)Ni sub(11)Al sub(7.5) hydrogen-storage alloys. No correlation between the investigated physical parameters and the Pd content of the samples could be observed.
ISSN:0925-8388
DOI:10.1016/j.jallcom.2010.05.092