Ordering effect on the mechanical, electronic and magnetic properties of the beta-based non-canonical approximant phases: beta-Al50Cu33Fe17, eta-Al50Cu44Fe6 and phi-Al47.5Cu49.5Fe3 / Shalaeva E. V.,Medvedeva N. I.,Prekul A. F.,Smirnova E. O.,Smirnov S. V.,Shchegolikhina N. I.,Selyanin I. O. // PHILOSOPHICAL MAGAZINE. - 2017. - V. 97, l. 13, A. - P. 1024-1046.

ISSN/EISSN:

1478-6435 / 1478-6443

Type:

Article

Abstract:

Using transmission electron microscopy and X-ray diffraction, we established that the ordered eta 1-Al50Cu44Fe6 and phi-Al47.5Cu49.5Fe3 (Fmm2) alloys with nano-sized domain structure are formed by slowly cooling, whereas beta-solid solutions with a short-range order were found in quenched states. The phi'-modification which exhibits the additional long-period superstructure was also observed in Al47.5Cu49.5Fe3. The studies of low temperature magnetic susceptibility and heat capacity did not reveal any another phase transitions in these alloys. The indentation test showed that hardness and Young's modulus consistently grow as beta-Al50Cu33Fe17 -> eta 1-Al50Cu44Fe6 -> (phi+phi')-Al47.5Cu49.5Fe3 and approach to those in icosahedral phase. The same trend in the Young's modulus was obtained for alloys containing beta-solid solution with a short-range order. Ab initio calculations, however, predicted the opposite tendency in cubic beta-Al50Cu50-xFex with a decrease in x, which was explained by the weakening of the covalent Fe 3d-Al sp bonding. This discrepancy between the results for beta- and ordered phases, we related to a crucial effect of ordering which is accompanied by a progressive distortion of cubic local structure in the series beta-Al50Cu33Fe17 -> eta 1-Al50Cu44Fe6 -> phi-Al47.5Cu49.5Fe3. As we demonstrated for eta-Al(Cu,Fe), these distortions lead to the strengthening of the both covalent FeAl and Cu-Al bonds and the higher modules.

Author keywords:

Aluminium alloys; approximants; phase transformations; transmission electron microscopy; indentation; mechanical properties; ab initio; electronic structure TOTAL-ENERGY CALCULATIONS; WAVE BASIS-SET; CRYSTAL-STRUCTURE; QUASI-CRYSTALS; SOLID-SOLUTION; STABILITY; ALLOYS; TEMPERATURE; STATE; ALUMINIDES

DOI:

10.1080/14786435.2017.1287970

Web of Science ID:

ISI:000398451500003

Соавторы в МНС:

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Другие поля

Поле	Значение
Publisher	TAYLOR \& FRANCIS LTD
Address	2-4 PARK SQUARE, MILTON PARK, ABINGDON OR14 4RN, OXON, ENGLAND
Language	English
EISSN	1478-6443
Keywords-Plus	TOTAL-ENERGY CALCULATIONS; WAVE BASIS-SET; CRYSTAL-STRUCTURE; QUASI-CRYSTALS; SOLID-SOLUTION; STABILITY; ALLOYS; TEMPERATURE; STATE; ALUMINIDES
Research-Areas	Materials Science; Metallurgy \& Metallurgical Engineering; Physics
Web-of-Science-Categories	Materials Science, Multidisciplinary; Metallurgy \& Metallurgical Engineering; Physics, Applied; Physics, Condensed Matter
Author-Email	shalaeva@ihim.uran.ru
Funding-Acknowledgement	Russian Foundation for Basic Research {[}16-02-00085]; Complex Program of the Ural Branch, Russian Academy of Sciences {[}15-17-2-12]
Funding-Text	This work was supported by the Russian Foundation for Basic Research {[}grant number 16-02-00085] and in part by the Complex Program of the Ural Branch, Russian Academy of Sciences {[}grant number 15-17-2-12].
Number-of-Cited-References	32
Usage-Count-Last-180-days	3
Usage-Count-Since-2013	3
Journal-ISO	Philos. Mag.
Doc-Delivery-Number	ER0BP