|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||Advanced Characterization Techniques for Quantifying and Modeling Deformation
||Coupling In-situ SEM Experiments with Acoustic Emission to Unravel the Underlying Deformation Mechanism in Metals
||Mostafa Omar, Jaafar El-Awady
|On-Site Speaker (Planned)
Metals exhibit different deformation mechanisms. Conventional load-displacement curves are inadequate for discrimination between active mechanisms that temporally overlap. Dislocations, twinning, and cracks generates different acoustic emission (AE) signatures when activated. In this work, AE technique is coupled with in-situ micromechanical testing inside the SEM to study the deformation of microcrystals. By simultaneously recording the generated AE signals while running microcompression tests, correlations were drawn between the AE wave characteristics and the generated stress-strain curves. AE analysis in both time and frequency domains can differentiate between various active sources and probe the underlying deformation kinetics. In addition, statistics associated with strain bursts in single crystal Ni microcrystal are discussed as well as the impact of using stiff vs. laterally compliant compression tips on the generated signals.