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Microstructural Evolution of Severely Plastically Deformed Sensitized Aluminum 5456-H116 Treated by Ultrasonic Impact Treatment


  • This work was supported by the Office of Naval Research (ONR) grant No. N000141010867, N000141210424, and Naval Surface Warfare Center Carderock Division (NSWCCD) grant N001671000168. The authors would like to acknowledge the support of the Maryland NanoCenter and Nanoscale Imaging Spectroscopy and Properties Laboratory (NISP Lab). The NISP Lab is supported by the National Science Foundation (NSF) as a Materials Research Science and Engineering Center (MRSEC) Shared Experimental Facility.



Sensitized aluminum 5456-H116 is characterized by a continuous network of β phase. The use of ultrasonic impact treatment refines the near surface microstructure to produce nanograins that vary in size from 2 to 200 nm in diameter. The deformation layer does not exhibit the presence of a continuous β phase indicating that the near surface microstructure undergoes recrystallization.