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
- Authors: Pozdniakov A.V.1, Aitmagambetov A.R.1, Makhov S.V.1, Napalkov V.I.2
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Affiliations:
- National University of Science and Technology MISiS
- Intermix Met
- Issue: Vol 118, No 5 (2017)
- Pages: 479-484
- Section: Strength and Plasticity
- URL: https://journals.rcsi.science/0031-918X/article/view/167055
- DOI: https://doi.org/10.1134/S0031918X17050118
- ID: 167055
Cite item
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.
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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
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