This up-to-date reference text discusses the fabrication technique to determine high specific strength of alloys including age-hardened aluminum alloys for several industrial applications. The text presents an exhaustive overview of the materials used in aircraft construction in general and age-hardened aluminum alloys in particular. The text discusses important concepts including surface fabrication using friction stir processing, friction stir processing tools, the effect of reinforcement particles and surface fabrication on age-hardened aluminum alloys. The text will facilitate the readers to avoid conditions which lead to a net negative impact on the resulting composites and selects the once which lead to a net gain. It will enable the readers, researchers, and professionals to plan and practice composite fabrication via friction stir processing (FSP) with a benefit of net strengthening. The text will serve as an ideal reference for graduate students and academic researchers in the field of mechanical engineering, aerospace engineering, and materials science. It will also be helpful to the professionals working in the aviation and manufacturing industries. The understanding of specific strength of materials used in applications including aerial vehicles and manufacturing is important. The proposed text highlights importance of age-hardened alloy as one of the materials used for diverse applications. It discusses strengthening strategies of existing age-hardened aluminum alloys through composite fabrication via a solid-state friction stir processing (FSP) route. The text will help students and professionals working in the field of manufacturing, materials science and aerospace engineering. The text discusses an important aspect of strengthening age-hardened alloy using solid-state friction stir processing for diverse applications in industries including manufacturing and aviation. It will serve as an ideal reference for graduate students, academic researchers, and professionals in the field of mechanical engineering, aerospace engineering, and materials science.