Processing Routes for Aluminum based Nano-Composites

• Main Author: Yu, Hao
• Other Authors: Jianyu Liang, Committee Member
• Format: Others
• Published: Digital WPI 2010
• Subjects: Electromagnetic Stirring; Metal Matrix Nano-Composites; Particle Agglomeration; Fabrication
• Online Access: https://digitalcommons.wpi.edu/etd-theses/367; https://digitalcommons.wpi.edu/cgi/viewcontent.cgi?article=1366&context=etd-theses

The term "Metal Matrix Nano-Composites (MMNCs)" broadly refers to a composite system that is based on metal or alloy substrate, combined with metallic or non-metallic nano-scale reinforcements. The main advantages of MMNCs include excellent mechanical performance, feasible to be used at elevated temperatures, good wear resistance, low creep rate, etc. In the recent past, MMNCs have been extensively studied, especially the method of fabrication as the processing of such composites is quite a challenge. Though a variety of processing methods have been explored and studied over the years, none have emerged as the optimum-processing route. The major issue that needs to be addressed is the tendency of nano-sized particles to cluster and also the challenge as to how to disperse them in the bulk melt. This work explored the feasibility of utilizing Lorentz forces to address both of these critical issues: clustering and dispersion. The work was carried out both theoretically as well as with accompanying validation experiments. The results indicate that Lorentz Forces may be viable and should be considered in the processing of MMNCs.