Effect of Heat Treatment on the Mechanical Properties and Corrosion Behaviour of Al–Si–Mg Alloy Systems

In this study, effects of heat treatment on microstructure, hardness and corrosion behaviour of Al based eutectic alloy systems directionally solidified at different growth rates were investigated. The compositions of alloys were selected as Al–12.95 wt % Si–4.96 wt % Mg and Al–13 wt % Mg 2 Si. Al–1...

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Bibliographic Details
Published in:Physics of metals and metallography 2022-12, Vol.123 (14), p.1499-1508
Main Authors: Yusuf Kaygısız, Didem Balun Kayan
Format: Article
Language:English
Subjects:
Alloy systems
Alloys
Aluminum base alloys
Chemistry and Materials Science
Cold water
Corrosion
Corrosion and anti-corrosives
Corrosion effects
Corrosion resistance
Corrosion resistant alloys
Directional solidification
Electrochemical impedance spectroscopy
Eutectic alloys
Hardness
Heat treating
Intermetallic compounds
Magnesium compounds
Materials Science
Mechanical properties
Metal silicides
Metallic Materials
Microstructure
Silicon
Solution heat treatment
Specialty metals industry
Strength and Plasticity
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Summary:In this study, effects of heat treatment on microstructure, hardness and corrosion behaviour of Al based eutectic alloy systems directionally solidified at different growth rates were investigated. The compositions of alloys were selected as Al–12.95 wt % Si–4.96 wt % Mg and Al–13 wt % Mg 2 Si. Al–12.95 wt % Si–4.96 wt % Mg and Al–13 wt % Mg 2 Si alloys were kept at 500 and 540°C for 2 h, respectively, then quenched in cold water and subsequently artificially aged at 180°C for 4 h. The microstructure of Al–12.95 wt % Si–4.96 wt % Mg eutectic alloy consists of irregular Si plates and Mg 2 Si Chinese script in an aluminium matrix, while the microstructure of Al–13 wt % Mg 2 Si pseudoeutectic alloy consists of Mg 2 Si Chinese script in an aluminium matrix phase. Hardness value increased from 83.7 ± 2.0 mm –2 to 125.3 ± 5.2 kg mm –2 and from 82.5 ± 1.0 to 121 ± 2.0 kg mm –2 with the effect of the growth rate and solution heat treatment for Al–12.95 wt % Si–4.96 wt % Mg and Al–13 wt % Mg 2 Si alloy, respectively. Corrosion behaviour of the samples were investigated by Tafel polarization curves and electrochemical impedance spectroscopy (EIS) techniques. The increasing solidification rate of the alloys and also the heat treatment process increased their corrosion resistance.
ISSN:0031-918X
1555-6190
DOI:10.1134/S0031918X22100210