This work will benefit casting technologies in which metal matrix composites are cast, such as squeeze casting, stir casting, low pressure permanent mold casting, and high pressure die casting. Different reinforcement materials at different loads interact differently with different aluminum alloys; therefore, the microstructure of the composite materials will be manipulated differently, requiring different heat treatment methods to refine or control grain structure and minimize inclusions. To achieve the desired balance between ductility and strength for the composite application, the heat treatment of the composite part requires much iteration of casting and heat treatment trials. However, this study will provide a much needed starting point and reference of trends as to what heat treatment conditions should be used to achieve optimal properties, thereby, translating into a reduced number of time consuming and costly iterations. The investigation of the selected flat specimen is representative of common MMC components used for braking, armor, and other common structural and wear applications. Specific commercial products that this study will immediately influence are shown in Figure 3; however, this project will also influence products outside REL through the published findings and association with AFS. The time to market is dependent on the length of this study (approximately 16 weeks), since heat treatment equipment and processes are already integrated into many casting facilities. However, the benefit from this study will come in the form of cost savings due to reduction of solution treatment and aging times required to treat the parts, corresponding to reduced manufacturing cycle times and reduced energy consumption.

Status Update: Test specimens have been cast and heat treated. The tensile testing is underway and will submit a final report for next quarter. Those wishing further information on the project should contact Adam Loukas, REL, at This e-mail address is being protected from spam bots, you need JavaScript enabled to view it .