A.L. Beltyukov, B.A. Rusanov, D.A. Yagodin, A.I. Moroz, Ye.V. Sterkhov, L.D. Son, V. I. Ladyanov.
ABSTRACT
Aluminum-based alloys prone to amorphization are actively studied due to their low specific gravity, high mechanical and corrosion properties. In this paper, experimental studies of the viscosity (by the Shvidkovsky method), density (by the penetrating gamma radiation method) and electrical resistance (by the contactless rotating magnetic field method) of the amorphous alloy Al91La9 in a wide temperature range are carried out. The measurements were carried out in an atmosphere of high-purity helium. The samples were prepared by five-fold vacuum-arc melting in an atmosphere of high-purity helium. The chemical analysis of the obtained composition was carried out on an atomic emission spectrometer with inductively coupled plasma. The morphology of the formed compounds in the alloy was studied using a scanning electron microscope. The elemental composition of the regions differing in contrast was determined using micro-X ray analysis. Studies of the phase composition were carried out on a diffractometer using CuKα radiation.
It is shown that this alloy in the liquid state is characterized by the presence of hysteresis (mismatch of the course of the heating and cooling polytherms) properties and long-term temporary processes of transition to a more homogeneous state (long-term relaxation). These processes are observed for viscosity and density, but are not detected in electrical resistance measurements. Therefore, we believe that they do not affect the local order in the melt, but occur on a meso- or macroscopic scale.
KEYWORDS: aluminum alloys, viscosity, density, gamma absorption method, melts, aluminum, rare earth metals, long-term relaxation, inhomogeneities.
DOI: 10.31857/S0235010622050024