1. Production and Investigation of New Cast Aluminium Alloy with Lithium Addition
- Author
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Blaž Leskovar, Mitja Petrič, Primož Mrvar, Bastri Zeka, and Boštjan Markoli
- Subjects
020209 energy ,chemistry.chemical_element ,02 engineering and technology ,precipitation ,mechanical properties ,microstructural constituents ,020401 chemical engineering ,Aluminium ,0202 electrical engineering, electronic engineering, information engineering ,Aluminium alloy ,0204 chemical engineering ,QE1-996.5 ,Mining engineering. Metallurgy ,Precipitation (chemistry) ,aluminium ,Metallurgy ,staranje ,TN1-997 ,Geology ,precipitacija ,aluminij ,mehanske lastnosti ,chemistry ,ageing ,visual_art ,visual_art.visual_art_medium ,mikrostrukturne sestavine ,Lithium - Abstract
Lithium additions to Al offer the promise of substantially reducing the weight of alloys, since each 1 wt. % Li added to Al reduces density by 3 % and increases elastic modulus. In the present work, the effect of 1.46 wt. % Li addition to AlSi7Mg (containing 7.05 wt. % Si and 0.35 wt. % Mg) was studied. The alloy showed reduced density and higher hardness after natural ageing. Experimental work showed that micro-structural and mechanical properties changed with Li addition. It was observed that 0.80 wt. % Li addition resulted in formation of new phase AlLiSi which has a great effect to increase hardness of AlSi7Mg. According to Scanning Electron Microscope (SEM) and X-ray diffraction analysis it was confirmed that the addition of Li causes formation of different phases which are: α-Al, β-Si and AlLiSi.
- Published
- 2020