Predicting the Formation of Intermetallic Phases in the Al-Si-Fe System with Mn Additions

Author(s)

Otani, Lucas Barcelos ; Soyama, Juliano ; Zepon, Guilherme ; Costa e Silva, Andre ; Kiminami, Claudio Shyinti ; Botta, Walter Jose ; Bolfarini, Claudemiro

• Document type: Journal article
• Source: JOURNAL OF PHASE EQUILIBRIA AND DIFFUSION; v. 38, n. 3, p. 298-304, JUN 2017.
• Web of Science Citations: 6

Abstract

Phase formation was investigated via thermodynamic calculations of the Al-Si-Fe system within the range of commercial compositions with additions of Mn as a quaternary element. The calculations were performed using a commercial aluminum thermodynamic database and were compared with experimental data on sand casting from the literature. Both equilibrium and Scheil-Gulliver models were analyzed. The results showed that by adding Mn to the alloy it was possible to favor the formation of the Chinese script alpha-Al-15(Fe,Mn)(3)Si-2 intermetallic instead of the harmful platelet-shaped beta-Al5SiFe. Furthermore, the calculations indicated that with higher amounts of Mn, the beta-Al5SiFe intermetallic can be formed via a solid-state reaction, while alpha-Al-15(Fe,Mn)(3)Si-2 becomes the primary phase to form from the melt (also known as ``sludge{''} in the aluminum foundry industry). A relationship between Fe and Mn contents was identified that can prevent the formation of the beta-Al5SiFe intermetallic. (AU)

• FAPESP's process: 13/05987-8 - Processing and characterization of amorphous, metastable and nano-structured metallic alloys
• Grantee: Claudio Shyinti Kiminami
• Support Opportunities: Research Projects - Thematic Grants