Founding Research Journal

Founding Research Journal

The influence of Solid Fraction on the Microstructural Evolution and ‎Mechanical Properties of ‎in situ Mg/Mg2Si Composite Produced by Semi-Solid ‎Casting Process

Document Type : Original Research Article

Authors
Hasan Hosseini-Jebeli 1
Mehdi Raeissi 2
Sayyed Hasan Nourbaksh 3
1 M.Sc., Faculty of Materials Engineering, Shahrekord University, Shahrekord, IRAN
2 Assistant Professor, Faculty of Materials Engineering, Shahrekord University, Shahrekord, IRAN
3 Associate Professor, 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 a semi-solid casting process (using the mechanical stirring method) and the effects of the 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 rise 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 a 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.
Keywords
Mg/Mg2Si in-situ composite
Semisolid processing
Non-dendritic microstructure
Mechanical properties
Subjects
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Founding Research Journal
Volume 6, Issue 3 - Serial Number 21
Winter 2022
Pages 171-182

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