The τ-plot, a multicomponent 1-D pole figure plot, to quantify the heterogeneity of plastic deformation

• Published in: Materials characterization 2020-02, Vol.160, p.110114, Article 110114
• Main Authors: Simm, T.H., Das, Y.B., Forsey, A.N., Gungor, S., Fitzpatrick, M.E., Prakash, D.G.L., Moat, R.J., Birosca, S., Quinta da Fonseca, J., Perkins, K.M.
• Format: Article
• Language: English
• Subjects: Alloy steel; Backscattering; Crystallites; Crystallographic orientations; Deformation heterogeneities; Diffraction peak profile analysis; Diffraction peaks; Digital image correlation; Digital image correlations; Dislocation densities; Electron back scatter diffraction; Electron backscatter diffraction; Electron diffraction; Heterogeneous deformation; High strength steel; Image analysis; Neutron diffraction; Planar fault; Planar faults; Plastic deformation; Strain; Strain measurement; Textures; Transformation Induced Plasticity steel; TRIP steel
• ISSN: 1044-5803; 1873-4189; 1873-4189
• DOI: 10.1016/j.matchar.2019.110114

An approach is presented that allows multi-scale characterisations of heterogeneous deformation in crystalline materials by employing a range of characterisation techniques including: electron backscatter diffraction, digital image correlation and neutron diffraction powder measurements. The approach will be used to obtain critical information about the variations in parameters that characterise the deformed state in different crystallographic orientation texture components of a sample in a statistically significant way. These parameters include lattice strains, texture evolution, peak broadening, dislocation density, planar faults, phase changes and surface strain. This approach allows verification of models of plastic deformation to provide a more detailed view of plastic deformation heterogeneity at multiple length scales than obtained by other characterisation approaches. The approach demonstrated here is applied to two stainless steel alloys; an alloy that exhibits phase transformation during deformation and an alloy that remains the same phase all through deformation process. •An approach to characterise the heterogeneous nature of deformation in materials•The ability to combine powder diffraction and multiple electron microscopy methods•Obtain information and model deformation at multiple length scales•Easy and useful test to perform to help verify lattice strain models•Stainless steel alloys that do and do not transform to martensite are compared