Solidification behaviour and microstructure of AlSi7Mg cast alloy with addition of Li

Petrič, Mitja (author), Zeka, Bastri (author), Mrvar, Primož (author), Nagode, Aleš (author), Vončina, Maja (author), Balaško, Tilen (author)

The constant need for the development of new alloys with an improved ratio between weight and strength is the driving force for the progress of the present work, which deals with the production of a new Al-cast alloy with the addition of lithium (Li). 0.8 wt% Li was added to the AlSi7Mg alloy. The solidification behaviour of such a new alloy was the focus of the work. The melt was produced in an inert gas atmosphere in an induction furnace. The solidification behaviour was described by CALPHAD simulations, optical microscopy, scanning electron microscopy (SEM) and simple thermal analysis. In addition, the Vickers hardness (HV) was measured 29 days after casting and compared with the results of the AlSi7Mg base alloy. Solidification proceeds somewhat differently from the base alloy, where the liquidus temperature is raised to 637 °C, where the primary AlLiSi phase forms, followed by α$_{Al}$ dendrites, eutectic β$_{Si}$ and other phases in the form of eutectics, which are known to occur during solidification of the AlSi7Mg alloy. The hardness of the new alloy is increased compared to the base alloy, especially at higher cooling rates, where the hardness gain is up to 36%.

• Language: English
• Keywords: lithium addition, Al-cast alloy, solidification, thermal analysis, hardness
• Work type: Article
• Typology: 1.01 - Original Scientific Article
• Organization: NTF - Faculty of Natural Sciences and Engineering
• Publication status: Published
• Publication version: Version of Record
• Year: 2022
• Number of pages: Str. 2084-2092
• Numbering: Vol. 19
• PID: 20.500.12556/RUL-138217
• UDC: 669
• ISSN on article: 2238-7854
• DOI: 10.1016/j.jmrt.2022.05.171
• COBISS.SI-ID: 110928131
• Publication date in RUL: 13.07.2022

Record is a part of a journal

• Title: Journal of materials research and technology
• Shortened title: J. mater. res. technol.
• Publisher: Elsevier
• ISSN: 2238-7854
• COBISS.SI-ID: 519699737

Licences

• License: CC BY-NC-ND 4.0, Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International
• Link: http://creativecommons.org/licenses/by-nc-nd/4.0/
• Description: The most restrictive Creative Commons license. This only allows people to download and share the work for no commercial gain and for no other purposes.

Projects

• Funder: ARRS - Slovenian Research Agency
• Project number: P2-0344
• Name: Napredna metalurgija