Improved mechanical properties of in-situ Al-Mg2Si composites via Sr addition

Document Type : Research Paper

Authors

School Of Metallurgy And Materials, College Of Engineering, University Of Tehran, Tehran, Iran

Abstract

Effects of strontium addition to the Al-Mg2Si composite on the microstructure, phase formation, and improvement of the mechanical properties in the wrought condition were investigated. Accordingly, 0, 1, 2, 3, and 5 wt.% Sr was added to the Al-15Mg2Si composite. Results revealed that the optimum Sr addition up to 2 wt.% leads to the modification of Mg2Si particles. Moreover, the emergence of Al2Si2Sr particles resulted in the development of a hybrid composite microstructure. These microstructural modifications, combined with the extrusion process, resulted in the improvement of mechanical properties, in terms of yield stress, ultimate tensile strength, total elongation, and tensile toughness. For instance, tensile toughness, as a measure of the strength-ductility synergy, for the Sr addition of 2 wt.% showed 30% improvement compared to the base composite. However, higher Sr additions of 3 and 5 wt.% resulted in the formation of coarse needle-shaped Al2Si2Sr and Al4Sr particles, which resulted in poor ductility and work-hardening behavior. Moreover, the significant reduction in the amount of Mg2Si phase at high Sr additions was found to be in contrast to the idea of hybrid composite formation. Accordingly, the present work sheds light on the development of hybrid Al-Mg2Si/Al2Si2Sr composites via optimum Sr addition to the Al-Mg2Si composite for the improvement of mechanical behavior.

Keywords

References

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Journal of Ultrafine Grained and Nanostructured Materials
Volume 59, Issue 1
June 2026
Pages 1-10

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History

  • Receive Date: 11 November 2025
  • Revise Date: 07 February 2026
  • Accept Date: 14 February 2026

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