TITLE

Evidence of icosahedral short-range order in Zr[sub 70]Cu[sub 30] and Zr[sub 70]Cu[sub 29]Pd[sub 1] metallic glasses

AUTHOR(S)
Saksl, K.; Franz, H.; Jóvári, P.; Klementiev, K.; Welter, E.; Ehnes, A.; Saida, J.; Inoue, A.; Jiang, J.Z.
PUB. DATE
November 2003
SOURCE
Applied Physics Letters;11/10/2003, Vol. 83 Issue 19, p3924
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Change in local atomic environment during crystallization of Zr-based glassy alloys was studied by extended x-ray absorption fine structure (EXAFS) spectroscopy. The formation of icosahedral quasicrystalline phase followed by crystallization of tetragonal CuZr[sub 2] has been observed in the Zr[sub 70]Cu[sub 29]Pd[sub 1] glassy alloy during annealing up to 850 K. On the other hand, the binary Zr[sub 70]Cu[sub 30] alloy shows a single glassy to crystalline CuZr[sub 2] phase transformation. The local atomic environment of as-quenched Zr[sub 70]Cu[sub 30] alloy is matched to an icosahedral local atomic configuration, which is similar to that of the as-quenched Zr[sub 70]Cu[sub 29]Pd[sub 1] alloy and the alloy annealed at 593 K containing icosahedral phase. Considering that the supercooled liquid region appears prior to crystallization in the Zr[sub 70]Cu[sub 30] glassy alloy, the observed results support the theory claiming a strong correlation between the existence of local icosahedral short-range order and stability of the supercooled liquid state. © 2003 American Institute of Physics.
ACCESSION #
11332770

 

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