Abstract
The objective of this paper is to investigate the effect of friction stir processing (FSP) on the ballistic performance of armor grade aluminum and steel plates. FSP is a solid state microstructural modification process that was adapted from the concepts of friction stir welding (FSW). FSP has shown to locally refine the microstructures and eliminate many casting defects for improved mechanical and corrosion properties. Armor grade aluminum (6061 and 7039) and high-strength low-alloy (HSLA- MIL-A-12560) steel were prepared in various thicknesses. The prepared plates were then FSP in partial penetration overlapping passes to provide for the largest area of processed material possible. The plates were then tested in accordance with MIL-STD-662E to determine the V50 ballistic limit of the armor. Results from the ballistic testing of processed panels were analyzed and compared with the parent material. Microstructural differences observed between the processed and unprocessed panels were characterized and correlated with the ballistic performance.
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