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Meso/Micro Scale Slip System Activity Study in Ti6al4v Using High Resolution Digital Image Correlation

SSRN, ISSN: 1556-5068
2024
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Article Description

The slip system behaviour of Ti6Al4V alloy under uniaxial tension was quantitatively characterised using a combination of high-resolution digital image correlation (HRDIC), electron backscatter diffraction (EBSD), trace analysis, and relative displacement ratio (RDR) analysis. The results highlight significant roles played by different slip systems, notably cross slip, which contributes substantially to the plastic deformation. Despite frequent activation in a large number of favourably oriented grains, slip systems contribute a limited portion only of the overall strain, in contrast to the slip lines that demonstrate higher strain and more pronounced activity. The meso-scale distribution of strain is characterized using a grain-based HRDIC map, revealing variable strain levels influenced by crystal orientations and local microstructure. Compressive residual strain in grains with minimal slip activity indicates the influence of neighbouring grains with higher defect storage.

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