TITLE

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

AUTHOR(S)
Hu, Lina; Chunzhi Zhang; Yuanzheng Yue
PUB. DATE
May 2010
SOURCE
Applied Physics Letters;5/31/2010, Vol. 96 Issue 22, p221908
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
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.
ACCESSION #
51227009

 

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