The development and validation of crystal plasticity models requires the ability to map deformation at microstructural scale. Here, a new method high-resolution mapping is used measure strain, material rotation lattice in austenitic stainless steel sub-micron resolution. Electron back-scatter diffraction maps are link microstructure. Deformation occurs domains, which most plastic strain originates from activation single slip system with high resolved shear stress. Within localized lamellar...

The plastic deformation of single crystal magnesium is strongly anisotropic. This gives rise to incompatibilities between grains during polycrystalline deformation, which are thought limit ductility and formability. Wrought alloys far from brittle, especially in uniaxial tension, implying that these can be accommodated some extent, although it not clear how. We have used high-resolution digital image correlation (HRDIC), supported by electron backscatter diffraction (EBSD), study...

The deformation mechanisms of binary Ti–Al model alloys (0–13.1 at.% Aluminium) have been investigated with respect to the twinning activity using in-situ loading in combination neutron diffraction as well detailed post mortem electron backscatter analysis. A consistent starting grain size and texture was generated for all promoting tensile during compression testing. Long-wavelength selected area transmission microscopy analysis were carried out detect evidence Aluminium ordering Ti3Al...

Understanding the deformation, strengthening and failure mechanisms in polycrystalline nickel-base superalloys is necessary to develop next generation alloys for application highly demanding environments. Here, aim examine various ways which solution- γ' precipitation-strengthening affect deformation behaviour of three Ni-based through mapping investigation at multiple length-scales. This achieved using high-resolution digital image correlation quantify local strain, electron backscattered...

Misorientation data from Electron Backscatter Diffraction (EBSD) is often used to identify strain localisation and quantify plastic at the microstructural scale. However, exact relationship between local misorientation how it changes grain sub-grain level has not been studied in detail. We have high resolution digital image correlation (HRDIC) measure sub-micron scale on surface of a nickel superalloy strained 2%. The values correlated different measures subgrain scale, over several hundreds...

During service of gas turbine engines, high cycle fatigue titanium is a leading cause component failure highlighting the need for better understanding crack initiation mechanism to predict sites. In this study, relationship between plastic slip activity and was investigated in near-α alloy using cyclic four-point bending at up 90% proof stress. The finding from surface characterization show that plasticity such low stress levels dominated by basal two types cracking were seen parallel...

The role of different microstructural constituents on crack initiation in two-phase titanium alloys is still an area great controversy. present study investigates the effects primary α volume fraction and concomitant macrozones two fatigue modes concurrently observed a near-α alloy. Statistically representative regions were monitored quasi-in-situ studies by interrupting testing to detect slip trace formation leading initiation. In addition, high-resolution 2D strain maps generated quantify...

Summary Optical correlation is an emerging strain‐mapping technique that allows full‐field surface strain mapping by comparing the images of same region before, during and after deformation. The fundamental aspects optical are presented, with emphasis on applicability to analysis micrographs obtained in situ deformation studies. Without considering specific algorithms, this paper discusses important practical issues such as accuracy spatial resolution how these affected image quality other...

To study the effect of γ′ precipitate size on deformation behaviour a polycrystalline nickel-based superalloy, model microstructures with unimodal distribution were developed and subjected to loading experiments at 750 °C. Neutron diffraction measurements carried out during record elastic lattice strain response γ phase. A two-site elasto-plastic self-consistent (EPSC) assisted in interpretation response. In addition, deformed specimens analysed by (scanning) transmission electron microscopy...

Near-α titanium alloys are known to be susceptible cold dwell fatigue (CDF) debit, which has been linked the occurrence of creep during high-load times superimposed onto low cycle loading. In order shed new light on deformation mechanisms and understand better role microstructure, two different bimodal microstructures (fine coarse transformation product) TIMETAL®834 were investigated at stress levels below 0.2% proof using a combination grain orientation mapping in-situ electron microscopy...

High Resolution Digital Image Correlation in combination with orientation imaging microscopy has been applied to compare quantitatively strain localisation Ti-6Al-4V alloy a bimodal microstructure subjected two different ageing treatments, i.e. above and below the α2 solvus temperature. Interestingly, most pronounced heterogeneity was observed secondary-α regions for sample heat-treated promote formation. The high local associated intense slip bands within single long laths low levels of...

Metals with a hexagonal close packed structure can deform by several different slip modes Critical Resolved Shear Stresses, which provides great deal of complexity when considering mechanical performance Mg, Ti and Zr alloys. Hence, an accurate but also statistically meaningful analysis active systems their contribution to plasticity is importance for the understanding deformation mechanism. In present study, correlative scanning electron microscopy-based method trace has been utilised...

Additive Manufacture (AM) of Ti–6Al–4V frequently leads to undesirable, coarse, columnar β-grain structures with a strong <100> fibre texture. In Wire-Arc AM (WAAM), it has been found that the application low plastic strain, by methods such as inter-pass rolling, can disrupt β growth and produce refined, equiaxed grain structure is more randomly orientated. The origin this desirable effect investigated thermo-mechanical simulation, direct in-situ EBSD observation, well real-time synchrotron...