Viscosity of high-entropy melts in Cu-Sn-Pb-Bi-Ga, G-Sn, Cu-Pb, Cu-Ga, and Cu-Bi equiatomic compositions / Chikova O. A.,Tsepelev V. S.,V'yukhin V. V. // RUSSIAN JOURNAL OF NON-FERROUS METALS. - 2015. - V. 56, l. 3. - P. 246-250.

ISSN/EISSN:

1067-8212 / 1934-970X

Type:

Article

Abstract:

Temperature dependences of kinematic viscosity of high-entropy melts (HEM) of the composition, at \%, Cu-20Sn-20Pb-20Bi-20Ga, Cu-50Sn, Cu-50Pb, Cu-50Ga, and Cu-50Bi are investigated in a temperature range from 1550 to 1300A degrees C. It is shown that melt overheating above a definite temperature (t (hom)) leads to the appearance of viscosity hysteresis, which indicates a variation in the structural state of the HEM. The values of t (hom) for all studied samples are in limits of 925-1185A degrees C. It is found that heating the HEM to definite temperatures (t{*}) leads to a variation in the activation energy of viscous flow (E) and entropy multiplier (A) in the Arrhenius equation: nu = Aexp{[}E/(RT)]. Entropy of viscous flow (Delta S (\#)) for studied HEMs is investigated in terms of the Airing theory. It is revealed that the magnitude of Delta S\# for a five-component Cu-Sn-Pb-Bi-Ga melt in a cooling mode is smaller than during heating by a factor of 2.6. The rheological characteristics of HEMs allow us to consider these melts promising functional materials: solders, heat carriers, and electric contacts.

Author keywords:

entropy; melt; viscosity; melt structure ALLOY SYSTEM; MICROSTRUCTURE

DOI:

10.3103/S1067821215030037

Web of Science ID:

ISI:000357747800003

Соавторы в МНС:

Другие поля

Поле	Значение
Month	MAY
Publisher	ALLERTON PRESS INC
Address	18 WEST 27TH ST, NEW YORK, NY 10001 USA
Language	English
EISSN	1934-970X
Keywords-Plus	ALLOY SYSTEM; MICROSTRUCTURE
Research-Areas	Metallurgy \& Metallurgical Engineering
Web-of-Science-Categories	Metallurgy \& Metallurgical Engineering
Author-Email	chik63@mail.ru v.s.tsepelev@ustu.ru v.v.vyukhin@ustu.ru
Number-of-Cited-References	16
Usage-Count-Last-180-days	6
Usage-Count-Since-2013	20
Journal-ISO	Russ. J. Non-Ferrous Metals
Doc-Delivery-Number	CM5SB