The influence of solid fraction on the microstructural evolution and mechanical properties of in situ Mg/Mg2Si composite produced by semi-solid casting process

Articles in Press

Document Type : Original Research Article

Authors

1 Shahrekord university

2 Faculty of Materials Engineering, Shahrekord University, Shahrekord, IRAN

3 Faculty of Mechanical Engineering, Shahrekord University, Shahrekord, IRAN

10.22034/frj.2023.391080.1176

Abstract

In this research, the magnesium matrix composite reinforced with in-situ Mg2Si particles was produced by semi-solid casting process (using mechanical stirring method) and the effects of fraction of primary solid particles before casting on the morphology of Mg2Si primary particles as well as mechanical and wear properties of the produced composite, was studied. The results showed that the increase of the solid fraction has a significant effect on the morphology of the primary Mg2Si solid particles, and with the increase of the solid fraction before casting (lowering the casting temperature), the shape of the particles gradually transformed from faceted dendrite to polyhedral and finally pseudo-spherical morphology. Also, increasing the solid fraction improved the mechanical and wear properties of the composite. For example, the tensile strength of the composite increased from about 180 MPa for the sample cast in the molten state to 230 MPa for the sample cast in the solid fraction of 0.2 (an increase of 25% in strength). Meanwhile, the elongation increased from 2.3% for the sample cast in the molten state to 4% for the sample cast in the solid fraction 0.38 (about 48% increase). Parameters such as reducing the sharp areas with high stress concentration, the porosity and the average dimensions of primary solid particles and improvement in the bonding strength between the matrix and reinforcing particles with increasing solid fraction were believed to be effective factors in improving composite properties.

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Articles in Press, Accepted Manuscript
Available Online from 09 May 2023

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History

  • Receive Date: 27 March 2023
  • Revise Date: 03 May 2023
  • Accept Date: 09 May 2023

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