Page 88 - eBook_Proceedings of the International Conference on Digital Manufacturing V2

Proceedings of the International Conference on Digital Manufacturing –
Volume 2

The difference in microstructures suggests different processing
conditions or alloy compositions, which significantly affect the
material's properties. The study of these microstructures is crucial
in materials science and engineering for understanding and
controlling the mechanical, thermal, and electrical behaviour of
metallic materials (Ji, Wang & Dong, 2022).

Figure 30: Representative microstructure (a) dendritic morphology
resulting from conventional solidification, and (b) globular, non-
dendritic particles produced through intensive forced convection in
SSMP (Ji, Wang & Dong, 2022).

SSMP has several advantages over traditional metal forming
processes, including reduced porosity. In conventional casting,
turbulence during molten metal flow can trap air or gases, creating
porosity in the final product. Additionally, uneven shrinkage
during solidification can cause internal voids or surface defects,
compromising the structural integrity and appearance of the
components.

In its semi-solid state, the partially solidified slurry exhibits
reduced flow turbulence, thereby significantly lowering the
likelihood of air entrapment during processing. Solid particles
help maintain a uniform volume during solidification,
significantly reducing shrinkage-related defects. This controlled
process leads to components with improved density, fewer
internal voids, and enhanced mechanical properties, making them
suitable for high-reliability and strength applications.

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