Understanding Metal Matrix Composites Fabrication — Lesson 4

This lesson covers the fabrication of metal matrix composites through the additive manufacturing process. It delves into the factors affecting composite properties, including the mixing of matrix and reinforcing elements, the size of the reinforcing element, decomposition temperature, viscosity, pore formation, and buoyancy effects. The lesson also explains the influence of these factors on the final output. For instance, it discusses how the size of the reinforcing element affects microstructure densification, hardness, toughness, and wear. It also highlights the importance of maintaining the ball to powder ratio during the milling process.

Video Highlights

00:30 - Discussion on factors affecting composite properties
05:48 - Explanation on the importance of size of reinforcing element
11:41 - Explanation on the role of viscosity and pore formation in the process
17:05 - Explanation on the effects of buoyancy and surface tension in laser additive manufacturing fluid flow

Key Takeaways

- The properties of metal matrix composites are influenced by several factors such as the mixing of matrix and reinforcing elements, the size of the reinforcing element, and decomposition temperature.
- The milling process plays a crucial role in the fabrication of metal matrix composites. It involves maintaining the ball to powder ratio and safeguarding the mixing and milling environment.
- The size of the reinforcing element significantly affects the microstructure densification, hardness, toughness, and wear of the composite.
- The decomposition temperature is crucial as it determines whether the reinforcing agent will dissolve during the laser processing.
- Viscosity and pore formation are also important factors that affect the relative density of a composite.