Local atomic structure of Zr–Cu and Zr–Cu–Al amorphous alloys investigated by EXAFS method

▶ Coordination number, interatomic distances and mean square atomic displacement in Zr–Cu and Zr–Cu–Al glasses. ▶ Icosahedral symmetry in local atomic structure. ▶ Deviation from random mixing behavior resulting from Al addition. We report on extended X-ray absorption fine structure (EXAFS) study of...

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Vydané v:Journal of alloys and compounds Ročník 509; s. S34 - S37
Hlavní autori: Antonowicz, J., Pietnoczka, A., Zalewski, W., Bacewicz, R., Stoica, M., Georgarakis, K., Yavari, A.R.
Médium: Journal Article
Jazyk:English
Vydavateľské údaje: Elsevier B.V 01.06.2011
Elsevier
Predmet:
Alloys
Amorphous alloys
Amorphous materials
AMORPHOUS STRUCTURE
Atomic scale structure
Atomic structure
Chemical Sciences
Deviation
EXAFS
FITTINGS
Material chemistry
Metallic glasses
MOLECULAR STRUCTURE
QUENCHING MECHANISMS
Zirconium
ZIRCONIUM ALLOYS (50 TO 99 ZR)
Zirconium base alloys
ZIRCONIUM COPPERS
Atomic scale structure
Metallic glasses
Amorphous materials
EXAFS
ISSN:0925-8388, 1873-4669
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Popis
Shrnutí:▶ Coordination number, interatomic distances and mean square atomic displacement in Zr–Cu and Zr–Cu–Al glasses. ▶ Icosahedral symmetry in local atomic structure. ▶ Deviation from random mixing behavior resulting from Al addition. We report on extended X-ray absorption fine structure (EXAFS) study of rapidly quenched Zr–Cu and Zr–Cu–Al glassy alloys. The local atomic order around Zr and Cu atoms was investigated. From the EXAFS data fitting the values of coordination number, interatomic distances and mean square atomic displacement were obtained for wide range of compositions. It was found that icosahedral symmetry rather than that of corresponding crystalline analogs dominates in the local atomic structure of Zr–Cu and Zr–Cu–Al amorphous alloys. Judging from bonding preferences we conclude that addition of Al as an alloying element results in considerable deviation from random mixing behavior observed in binary Zr–Cu alloys.
Bibliografia:ObjectType-Article-2
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ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2010.10.105