Metal matrix nanocomposites PPT

temperature stability, high strength, high modulus, wear resistance, and thermal and electrical conductivity of the metal matrix. Aluminum nanocomposites are predicted to surpass the weight reduction currently realized through the use of polymer-based nanocomposites and polymer-based fiber composites in aerospace applications primarily because these metal matrices have higher strength and stiffness (Figure 1). They also have much better thermal stability.

Figure 1. Comparison of potential materials and reinforcements for aerospace applications. (Data for Al-70% CNT is theoretical)

The development of Metal Matrix Nanocomposites (MMNCs), however, is still in its infancy. The MMNCs synthesized to date include Al-B4C, Mg-SiC, Al-CNT, Cu-CNT and Ti-SiC, prepared using powder metallurgy, and Al-SiC, Mg-SiC, Al-Al2O3, Al- CNT, Mg-Y2O3, Al-Diamond, and Zn-SiC, prepared using solidification processing.

Though there is great potential for the use of MMNCs in a variety of applications, their use is hindered by their cost, difficulty in the manufacture of large complex shaped parts and their often poor ductility. This article briefly reviews the state-ofthe- art in metal matrix nanocomposites, with specific emphasis on how these drawbacks are being overcome through proactive design of nanostructures and processing techniques.