Quantitative Evaluation of Bulk and Interface Microstructures in Al-3003 Alloy Builds Made by Very High Power Ultrasonic Additive Manufacturing

• Published in: Metallurgical and materials transactions. A, Physical metallurgy and materials science Vol. 42; no. 13; pp. 4045 - 4055
• Main Authors: Fujii, Hiromichi T., Sriraman, M. R., Babu, S. S.
• Format: Journal Article
• Language: English
• Published: Boston Springer US 01-12-2011; Springer; Springer Nature B.V
• Subjects: Additives; Alloying additive; Alloys; Aluminum base alloys; Applied sciences; Characterization and Evaluation of Materials; Chemistry and Materials Science; Construction; Density; Elongation; Exact sciences and technology; Grains; Interfaces; Materials Science; Metallic Materials; Metals. Metallurgy; Microstructure; Nanotechnology; Physical metallurgy; Structural Materials; Surfaces and Interfaces; Thin Films; Ultrasonic technology; Dynamic Recrystallization; Subgrain Boundary; Peel Test; Interface Region; Misorientation Angle; Additive; Aluminium base alloys; Manufacturing; Microstructure; Interface
• ISSN: 1073-5623; 1543-1940
• DOI: 10.1007/s11661-011-0805-x

Ultrasonically consolidated 3003 aluminum alloy builds were prepared with constituent tapes by using a very high power ultrasonic additive manufacturing (UAM) process. Microstructures of interface and bulk regions were quantitatively characterized using the electron backscattered diffraction technique. The interface microstructure consists of equiaxed grains. The 〈111〉 crystallographic directions of these grains were aligned with the normal direction of the specimen, confirming a shear deformation mode at these regions. In addition, due to recrystallization, the density of low-angle grain boundaries also significantly decreased. In contrast, original elongated grains and partially recrystallized grains were observed in the bulk region of the tape. These elongated grains correspond to rolling texture components of face-centered-cubic materials. The preceding microstructure gradients are rationalized based on the accumulated thermomechanical cycles during processing.