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Characterization of mechanical deformation in aluminum by optical second harmonic generation

Journal Article · · Measurement Science and Technology
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 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 technique.

Research Organization:
Brigham Young Univ., Provo, UT (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
DOE Contract Number:
SC0012587;
OSTI ID:
1851718
Journal Information:
Measurement Science and Technology, Journal Name: Measurement Science and Technology Journal Issue: 7 Vol. 32; ISSN 0957-0233
Publisher:
IOP Publishing
Country of Publication:
United States
Language:
English

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