Characterization of mechanical deformation in aluminum by optical second harmonic generation
- 15 February 2021
- journal article
- research article
- Published by IOP Publishing in Measurement Science and Technology
- Vol. 32 (7), 075202
- https://doi.org/10.1088/1361-6501/abe668
Abstract
Second harmonic generation (SHG), a laser-based surface technique, was used to characterize near-surface defect evolution associated with mechanical deformation in 2024-T3 aluminum due to tensile loads. Electron backscatter diffraction (EBSD) measurements were also performed to determine the geometrically necessary dislocation (GND) density before and after tensile deformation. Comparison of the EBSD and SHG results found that dislocation density and SHG signal are inversely proportional; tensile deformation in the plastic regime led to an increase in dislocation density and a decrease in SHG response. A similar trend was seen in the SHG results on as-received (unpolished) Al samples; SHG response decreases with extent of plastic deformation. This study suggests that SHG has potential as a nondestructive evaluation (NDE) technique.Keywords
Funding Information
- NSF (DMR 1507095)
- US Department of Energy (DE-SC0012587)
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