Previous studies have revealed that dislocation structures in metals with medium-to-high stacking fault energy, depend on the grain orientation and therefore slip systems. In present work, dislocations eight slip-plane-aligned geometrically necessary boundaries (GNBs) three grains of near 45° ND rotated cube lightly rolled pure aluminium are characterized great detail using transmission electron microscopy. Dislocations all six Burgers vectors ½⟨1 1 0⟩ type expected for fcc crystals were...

A direct and effective method for synthesizing diaryl amides has been developed through the photocatalytic coupling of methyl nitroarenes. This employs FeCl3 as a redox-active photocatalyst under mild conditions to enable selective benzylic C-H activation concurrent nitro group reduction, eliminating necessity pre-functionalization. exhibits broad substrate scope, high functional tolerance, improved atom economy, offering sustainable practical alternative amide bond formation.

For the specific slip geometry of two sets coplanar systems (a total four systems) in fcc metals, range dislocation networks boundaries aligned with one active planes is predicted from Frank equation for free long-range elastic stresses. Detailed comparison experimental data eight cold-rolled aluminium grains 45° ND rotated Cube orientation conducted. It concluded that are Low-Energy Dislocation Structures, which good agreement while also lowering energy by reactions. Cross plays a role...

AISI 304L stainless steel in austenitized and solution nitrided condition was severely mechanically deformed by surface roller burnishing. High-temperature nitriding applied to achieve a nitrogen-concentration depth profile, leading depth-gradient the austenite stability. X-ray diffraction, electron microscopy hardness indentation were for characterization of graded microstructures obtained combining composition profile deformation profile. While severe plastic straining an specimen leads...

Recent synchrotron X-ray measurements examined three-dimensional boundary migration during recrystallization [Scripta Mater 205 (2021) 114187]. To analyze possible correlations between grain mobility and the observed heterogeneous migration, molecular dynamics simulations were carried out. Migration of two selected segments simulated in both planar spherical bicrystal atomistic models. These chosen because experiment one was to migrate much faster than other. The reveal that cannot account...

A synchrotron X-ray micro-diffraction based technique, namely differential aperture microscopy (DAXM), is used to investigate the subgrain evolution in bulk interior during ex-situ recovery annealing of a lightly deformed Al sample. This first 4D DAXM study recovery. Supplementary TEM observations reveal that enables proper reconstruction microstructure, with important addition it 3D. The result provides direct observation 3D microstructural and confirms boundary migration an mechanism for...

Boundary migration during recrystallization in the heterogeneous microstructure near a hardness indent lightly rolled pure Al was followed 3D. The after multiple steps of ex-situ annealing examined using synchrotron white-beam differential-aperture X-ray microscopy, supplemented by scanning electron microscopy. Heterogeneous boundary observed and analyzed terms driving force characteristics. results reveal very similar local stored energies misorientations for migrating stationary segments,...

Abstract This study examined the composition and characteristics of scales formed at different depths in an oil production well, which had developed over years well operation, workovers, interventions, by combined use optical microscopy, scanning electron energy‐dispersive X‐ray spectroscopy, transmission diffraction. The iron‐rich consist several mineral phases, including a dominant portion akagneite hibbingite, some barite, silicon dioxide, copper sulfide, small amounts iron oxide calcium...

White etching cracks and other microstructural features have been investigated in two 100Cr6 steel bearings failed after several years of service wind turbines. It is found that these propagate predominantly through prior austenite grains the tempered martensite structure. Both sharp gradual transitions between structure white matter adjacent to are observed. Furthermore, it suggested structural refinement carbide particles present microstructure turbine occurred at a late stage formation.

The flat surface of a Cu plate was processed by incremental frictional sliding at liquid nitrogen temperature. treatment results in hardened gradient layer as thick 1 mm the plate, which contains nanostructured on top with boundary spacing order 100 nm. increases increasing distance from surface, and is accompanied decrease hardness 2179±31MPa topmost to 568±10 MPa undeformed matrix.

In order to reveal the effect of hydrogen on room-temperature plasticity titanium alloys TC4 and TC21, compression tests have been carried out at room temperature. Results show that an appropriate amount can improve both TC21 alloys. The ultimate strain alloy containing a concentration 0.5 wt.% increases by 39% compared untreated material. For is increased 33% 0.6 wt.%. main reason for improvement hydrogen-induced discussed.

Abstract A method for visualization of low-misorientation dislocation structures from orientation data obtained by electron backscatter diffraction (EBSD) in scanning microscopy is presented. The termed “customized All-Euler maps”. microstructure high purity (99.996 wt.%) aluminum lightly rolled to a thickness reduction 12% presented as case study. Dislocation with misorientations across boundaries approaching the precision standard EBSD (∼0.5°) are revealed using customized maps. Cautions...

Abstract We report the observation of a small orientation gradient (~0.5° over few micrometers) in recrystallized grain formed at sample surface pure Al and elimination this during subsequential ex-situ annealing. The is 3D done using synchrotron white-beam differential-aperture X-ray microscopy with high angular resolution 0.01°. subsequent annealing are analyzed discussed.