Vachhani, Shraddha J.
Stored energy maps in deformed metals using spherical nanoindentation.
Degree: PhD, Mechanical Engineering, 2014, Georgia Tech
Microstructure changes that occur during the deformation and heat treatments involved in wrought processing of metals are of central importance in achieving the desired properties or performance characteristics in the finished products. However, thorough understanding of the evolution of microstructure during thermo-mechanical processing of metallic materials is largely hampered by lack of methods for characterizing reliably their local (anisotropic) properties at the sub-micron length scales. Recently, remarkable advances in nanoindentation data analysis techniques have been made which now make it possible to obtain quantitative information about the local mechanical properties of constituent individual grains in polycrystalline metallic samples. In this work, a novel approach that combines mechanical property information obtained from spherical nanoindentation with the complementary structure information measured locally at the indentation site, using Electron Backscattered Diffraction (EBSD), is used to systematically investigate the local structure-property relationships in fcc metals. This work is focused on obtaining insights into the changes in local stored energies of polycrystalline metallic samples as a function of their crystal orientation at increasing deformation levels. Furthermore, using the same approach, the evolution of mechanical properties in the grain boundary regions in these samples is studied in order to better understand the role of such interfaces during deformation and recrystallization processes. The findings provide valuable information regarding development of stored energy gradients in polycrystalline materials during macroscopic deformation.
Advisors/Committee Members: Kalidindi, Surya R. (advisor), Neu, Richard (committee member), Antoniou, Antonia (committee member), Garmestani, Hamid (committee member), Doherty, Roger D. (committee member).
Subjects/Keywords: Nanoindentation; OIM; Stored energy; Deformation; Fcc metals; Microstructure; Anisotropy; Nanotechnology; Nanostructured materials; Aluminum
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APA (6th Edition):
Vachhani, S. J. (2014). Stored energy maps in deformed metals using spherical nanoindentation. (Doctoral Dissertation). Georgia Tech. Retrieved from http://hdl.handle.net/1853/51813
Chicago Manual of Style (16th Edition):
Vachhani, Shraddha J. “Stored energy maps in deformed metals using spherical nanoindentation.” 2014. Doctoral Dissertation, Georgia Tech. Accessed April 22, 2019.
MLA Handbook (7th Edition):
Vachhani, Shraddha J. “Stored energy maps in deformed metals using spherical nanoindentation.” 2014. Web. 22 Apr 2019.
Vachhani SJ. Stored energy maps in deformed metals using spherical nanoindentation. [Internet] [Doctoral dissertation]. Georgia Tech; 2014. [cited 2019 Apr 22].
Available from: http://hdl.handle.net/1853/51813.
Council of Science Editors:
Vachhani SJ. Stored energy maps in deformed metals using spherical nanoindentation. [Doctoral Dissertation]. Georgia Tech; 2014. Available from: http://hdl.handle.net/1853/51813