Effect of impurities of Fe and Si on the structure and strengthening upon annealing of the Al–0.2% Zr–0.1% Sc alloys with and without Y additive


Cite item

Full Text

Open Access Open Access
Restricted Access Access granted
Restricted Access Subscription Access

Abstract

The effect of impurities of Fe and Si on the microstructure and kinetics of the change in the hardness during annealing of the cast Al–0.2% Zr–0.1% Sc and Al–0.2% Zr–0.1% Sc–0.2% Y alloys has been studied. It has been found that the presence of the impurities of Fe and Si in the Al–0.2% Zr–0.1% Sc alloy leads to a partial binding of scandium into the (Al, Fe, Si, Sc) and (Al, Fe, Sc) phases of crystallization origin and to the corresponding depletion of the aluminum solid solution of Sc. It has been shown that as a result, the strengthening is significantly decreases upon annealing. The addition of 0.2% Y into the Al–0.2% Zr–0.1% Sc alloy with impurities of Fe and Si leads to the formation of the Al3Y and (Al, Y, Fe, Si) phases, whereas Sc is completely dissolved in the aluminum solid solution. It has been shown that the addition of Y leads to an increase in the thermal stability of the alloys during annealing at temperatures of 250, 300, and 370°C and eliminates the negative effect of impurities of Fe and Si.

About the authors

A. V. Pozdniakov

National University of Science and Technology MISiS

Author for correspondence.
Email: pozdniakov@misis.ru
Russian Federation, Krymskii val 3, Moscow, 119049

A. R. Aitmagambetov

National University of Science and Technology MISiS

Email: pozdniakov@misis.ru
Russian Federation, Krymskii val 3, Moscow, 119049

S. V. Makhov

National University of Science and Technology MISiS

Email: pozdniakov@misis.ru
Russian Federation, Krymskii val 3, Moscow, 119049

V. I. Napalkov

Intermix Met

Email: pozdniakov@misis.ru
Russian Federation, Plyushchikha 62, Moscow, 119049

Supplementary files

Supplementary Files
Action
1. JATS XML

Copyright (c) 2017 Pleiades Publishing, Ltd.