|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||Advanced Characterization Techniques for Quantifying and Modeling Deformation
||Role of Misorientation on Grain Boundary Sliding through High-resolution Digital Image Correlation
||Alberto Orozco-Caballero, Eugenia Nieto-Valeiras, Javier Llorca, Fernando Carreņo
|On-Site Speaker (Planned)
Superplastic deformations are likely to occur in fine and highly misoriented microstructures through the activation of the grain boundary sliding (GBS) deformation mechanism. While it is generally proven that the optimum grain size is in the range 1-20 ĩm, corresponding values of misorientation are not stablished. This is mainly due to the experimental difficulties of relating the individual grain to grain misorientation to the overall superplastic deformation. Nevertheless, such limitation can be overcome by means of the recently developed High-Resolution Digital Image Correlation (HRDIC), a displacement mapping technique during mechanical loading that allows quantifying strain localization with resolutions bellow 100 nm. The material used in the present work is an overaged Al 7075 alloy subjected to severe friction stir processing in order to obtain a microstructure prone to GBS. The statistical HRDIC analysis of the sliding at individual boundaries allowed to determine the relative influence of misorientation on superplastic deformation.
||Aluminum, Mechanical Properties, Other