Paper Titles
Preface
Gelation, Vitrification and Shrinkage of Thermoset Polymers - Methods for Investigation and Modelling
p.1
Microstructural and Morphological Evolution of Novel In Situ Al-15%Mg₂Si-4.5%Si Composite with Strontium Addition
p.7
Fabrication and Thermomechanical Processing of Titanium-Based Laminates for Enhanced Performance under High Dynamic Impact
p.15
Phase Field Model of Modification of Microstructure of Al-15Mg2Si- 4.5Si Composite by Addition of Sr during Semi-Solid Processing
p.23
Effect of Oxygen on Phase Evolution in Al-Y2O3 Nanocomposites by Mechanical Alloying
p.29
Microstructures and Properties of Diffusion Layer Formed at Laminated Interface of Alumina-Particle Dispersed Magnesium Laminated Compacts Fabricated by MM/SPS Method
p.35
Mechanical and Thermal Properties of Harmonic Structure Composites with Ti-Ni Alloy and Copper
p.41
Structure of Ta2O5 containing Phosphate Invert Glasses Prepared by Liquid Phase Method
p.47

Phase Field Model of Modification of Microstructure of Al-15Mg2Si- 4.5Si Composite by Addition of Sr during Semi-Solid Processing

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Abstract:

Semi-solid processing over a cooling slope has emerged as an efficient technique for producing near-spherical grain structures in metallic composites. In this study, an Al-15Mg₂Si-4.5Si composite processed using this method exhibited globular Mg₂Si particles embedded within an α-Al matrix. The addition of 0.01% Sr further refined the microstructure by reducing the size of the Mg₂Si particles, acting as a grain-refining agent. To gain deeper insight into the effect of Sr addition on microstructure evolution during semi-solid processing, a two-dimensional phase field model is developed. Wherein, rather than modelling the nucleation of Sr-containing phases explicitly, the influence of Sr is realised by modifying the relevant phase field parameters. The simulations predicted key microstructural characteristics—including grain size, sphericity, area fraction and grain density of P-Mg₂Si —along with interfacial energy and mobility coefficients for both the base and Sr-modified composites. The phase field results show good agreement with experimental observations, validating the modelling approach. Keywords: Semi-solid, Magnesium silicide, Phase field, grain refinement

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Periodical:

Materials Science Forum (Volume 1176)

Pages:

23-28

DOI:

https://doi.org/10.4028/p-Uj1voX

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Online since:

January 2026

Authors:

Indrani Mukherjee, Prosenjit Das*

Keywords:

Grain Refinement, Magnesium Silicide, Phase Field, Semi-Solid

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© 2026 Trans Tech Publications Ltd. All Rights Reserved

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