Research Article

Effects of Si, Fe, Mn and Mg on Solidification Characteristics of EN-AW 3105 Alu-minum Alloy: A CALPHAD-Based Multi-Objective Optimization

Volume: 6 Number: 3 June 17, 2026

Effects of Si, Fe, Mn and Mg on Solidification Characteristics of EN-AW 3105 Alu-minum Alloy: A CALPHAD-Based Multi-Objective Optimization

Abstract

Centerline segregation driven by the mushy zone width remains the primary defect limiting the broader application of twin-roll casting (TRC) for 3xxx series aluminum alloys. In this study, the individual and combined effects of Si (0.10–0.50 wt.%), Fe (0.30–0.70 wt.%), Mn (0.30–0.70 wt.%), and Mg (0.20–0.60 wt.%) on the solidification range, liquidus and solidus temperatures, and latent heat of fusion of EN-AW 3105 alloy were investigated using 56 equilibrium calculations performed with ThermoCalc. Sobol variance-based global sensitivity analysis revealed that the solidification range is predominantly controlled by Mn (total-order index ST = 0.512), attributed to the high equilibrium partition coefficient of Mn in aluminum (k₀ ≈ 0.94) and the promotion of Al₆(Fe,Mn) intermetallics that raise the solidus temperature. Si overwhelmingly governed the latent heat (ST = 0.926) through its control over the Al-Si eutectic fraction, while Si and Mg co-dominated the liquidus temperature (ST = 0.445 and 0.345, respectively). Fe showed consistently low thermophysical sensitivity (ST < 0.16), confirming its primary role in controlling intermetallic morphology rather than solidification temperatures. To identify optimal compositions for TRC, a Gaussian Process Regression surrogate model (10-fold CV R² = 0.90, selected from five candidate algorithms) was coupled with the NSGA-III evolutionary algorithm for simultaneous minimization of solidification range, liquidus temperature, and latent heat. Entropy-weighted TOPSIS identified a compromise composition of Si: 0.38, Fe: 0.70, Mn: 0.70, Mg: 0.24 (wt.%) with a solidification range of 7.24 °C (8.9% improvement), whose Mn/Fe ratio (≈1.0) additionally promotes the beneficial β→α intermetallic transformation.

Keywords

Supporting Institution

Authors are grateful to the financial support provided by Research Fund of the Sakarya University of Applied Sciences. Project Number: 079-2022

Project Number

079-2022

Ethical Statement

The authors declare that there is no conflict of interest in the study.

Thanks

Authors are grateful to the financial support provided by Research Fund of the Sakarya University of Applied Sciences. Project Number: 079-2022

References

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Details

Primary Language

English

Subjects

Materials Science and Technologies, Computational Material Sciences, Metals and Alloy Materials

Journal Section

Research Article

Publication Date

June 17, 2026

Submission Date

January 31, 2026

Acceptance Date

May 13, 2026

Published in Issue

Year 2026 Volume: 6 Number: 3

APA
Şirin, S., & Kılınç, B. (2026). Effects of Si, Fe, Mn and Mg on Solidification Characteristics of EN-AW 3105 Alu-minum Alloy: A CALPHAD-Based Multi-Objective Optimization. Engineering Perspective, 6(3), 503-510. https://doi.org/10.64808/engineeringperspective.1878888
AMA
1.Şirin S, Kılınç B. Effects of Si, Fe, Mn and Mg on Solidification Characteristics of EN-AW 3105 Alu-minum Alloy: A CALPHAD-Based Multi-Objective Optimization. engineeringperspective. 2026;6(3):503-510. doi:10.64808/engineeringperspective.1878888
Chicago
Şirin, Selçuk, and Bülent Kılınç. 2026. “Effects of Si, Fe, Mn and Mg on Solidification Characteristics of EN-AW 3105 Alu-Minum Alloy: A CALPHAD-Based Multi-Objective Optimization”. Engineering Perspective 6 (3): 503-10. https://doi.org/10.64808/engineeringperspective.1878888.
EndNote
Şirin S, Kılınç B (June 1, 2026) Effects of Si, Fe, Mn and Mg on Solidification Characteristics of EN-AW 3105 Alu-minum Alloy: A CALPHAD-Based Multi-Objective Optimization. Engineering Perspective 6 3 503–510.
IEEE
[1]S. Şirin and B. Kılınç, “Effects of Si, Fe, Mn and Mg on Solidification Characteristics of EN-AW 3105 Alu-minum Alloy: A CALPHAD-Based Multi-Objective Optimization”, engineeringperspective, vol. 6, no. 3, pp. 503–510, June 2026, doi: 10.64808/engineeringperspective.1878888.
ISNAD
Şirin, Selçuk - Kılınç, Bülent. “Effects of Si, Fe, Mn and Mg on Solidification Characteristics of EN-AW 3105 Alu-Minum Alloy: A CALPHAD-Based Multi-Objective Optimization”. Engineering Perspective 6/3 (June 1, 2026): 503-510. https://doi.org/10.64808/engineeringperspective.1878888.
JAMA
1.Şirin S, Kılınç B. Effects of Si, Fe, Mn and Mg on Solidification Characteristics of EN-AW 3105 Alu-minum Alloy: A CALPHAD-Based Multi-Objective Optimization. engineeringperspective. 2026;6:503–510.
MLA
Şirin, Selçuk, and Bülent Kılınç. “Effects of Si, Fe, Mn and Mg on Solidification Characteristics of EN-AW 3105 Alu-Minum Alloy: A CALPHAD-Based Multi-Objective Optimization”. Engineering Perspective, vol. 6, no. 3, June 2026, pp. 503-10, doi:10.64808/engineeringperspective.1878888.
Vancouver
1.Selçuk Şirin, Bülent Kılınç. Effects of Si, Fe, Mn and Mg on Solidification Characteristics of EN-AW 3105 Alu-minum Alloy: A CALPHAD-Based Multi-Objective Optimization. engineeringperspective. 2026 Jun. 1;6(3):503-10. doi:10.64808/engineeringperspective.1878888

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