Journal
APPLIED PHYSICS LETTERS
Volume 96, Issue 22, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3447373
Keywords
aluminium alloys; glass structure; glass transition; lanthanum alloys; metallic glasses; nickel alloys; quenching (thermal); X-ray diffraction
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Funding
- National Basic Research Program of China [2007CB613901]
- National Natural Science Foundation of China [50801041, 50871061]
- Research Fund for the Doctoral Program of Higher Education of China [200804221041]
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We report the structural characteristics during the sub-T-g relaxation in hyperquenched La55Al25Ni20 glasses. The sub-T-g 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. (C) 2010 American Institute of Physics. [doi: 10.1063/1.3447373]
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