Mechanism of the Mg$_3$Bi$_2$ phase formation in Pb-free aluminum 6xxx alloy with bismuth addition

Rečnik, Simon (author), Bizjak, Milan (author), Medved, Jože (author), Cvahte, Peter (author), Karpe, Blaž (author), Nagode, Aleš (author)

In the present work, free-cutting aluminum alloy AA6026 with 1.1 wt.% bismuth addition was fabricated by different melt preparation methods in order to investigate whether the melt preparation route affects the solidification sequence and thus has an influence on the machinability of the alloy. All experiments were designed to simulate variable industrial conditions: addition of bismuth in an induction melting furnace, addition of bismuth in an electric resistance holding furnace, addition of bismuth together with grain refiner, effect of holding time and melt temperature before casting. Detailed thermodynamic analyses (DSC, Thermo-Calc) and microstructural characterization (SEM-EDS, XRD) have been performed to explain the solidification sequence, microstructure development and especially formation of the intermetallic Mg$_3$Bi$_2$ phase.

• Language: English
• Keywords: free-machining AA6xxx alloy, bismuth, Mg$_3$Bi$_2$ phase, solidifcation model
• 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: 2021
• Number of pages: 12 str.
• Numbering: Vol. 11, iss. 4, art. 424
• PID: 20.500.12556/RUL-135327
• UDC: 669
• ISSN on article: 2073-4352
• DOI: 10.3390/cryst11040424
• COBISS.SI-ID: 66695939
• Publication date in RUL: 08.03.2022

Record is a part of a journal

• Title: Crystals
• Shortened title: Crystals
• Publisher: MDPI
• ISSN: 2073-4352
• COBISS.SI-ID: 36677893

Licences

• License: CC BY 4.0, Creative Commons Attribution 4.0 International
• Link: http://creativecommons.org/licenses/by/4.0/
• Description: This is the standard Creative Commons license that gives others maximum freedom to do what they want with the work as long as they credit the author.
• Licensing start date: 14.04.2021

Projects

• Funder: ARRS - Slovenian Research Agency
• Project number: P1-0195
• Name: Geookolje in geomateriali

• Funder: Other - Other funder or multiple funders
• Funding programme: Impol d.o.o.
• Name: Development of aluminum free-cutting alloys