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Applied Physics Letters / Volume 96 / Issue 22 / STRUCTURAL, MECHANICAL, THERMODYNAMIC, AND OPTICAL PROPERTIES OF CONDENSED MATTER

Appl. Phys. Lett. 96, 221908 (2010); http://dx.doi.org/10.1063/1.3447373 (3 pages)

Structural evolution during the sub-Tg relaxation of hyperquenched metallic glasses

Lina Hu1, Chunzhi Zhang1, and Yuanzheng Yue1,2

1Key laboratory of Liquid Structure and Heredity of Materials (Ministry of Education), Shandong University, Jinan, Shandong 250061, China
2Section of Chemistry, Department of Life Sciences, Aalborg University, Sohngaardsholmsvej 57, DK-9000 Aalborg, Denmark

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(Received 11 March 2010; accepted 12 May 2010; published online 4 June 2010)

We report the structural characteristics during the sub-Tg relaxation in hyperquenched La55Al25Ni20 glasses. The sub-Tg relaxation is associated with the structural change in intermediate range order, as manifested by the appearance of a prepeak in the x-ray diffraction spectrum. Such structural change could be the source of the Johari–Goldstein relaxation in metallic glasses. The mechanism governing the evolution of the prepeak is different between the glasses with the fictive temperature below 604 K and those above 604 K. Cooperative motion of atoms in La-centered clusters was further discussed in terms of the atomic bond deficiency model.

© 2010 American Institute of Physics

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KEYWORDS and PACS

Keywords

aluminium alloys, glass structure, glass transition, lanthanum alloys, metallic glasses, nickel alloys, quenching (thermal), X-ray diffraction

PACS

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.3447373

PUBLICATION DATA

ISSN

0003-6951 (print)  
1077-3118 (online)

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$abstract.society.value is a Member of CrossRef American Institute of Physics

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