Strain, stress and stress relaxation in oxidized ZrCuAl-based bulk metallic glass

On the role of stress in microstructure evolution during thermo-chemical surface engineering

“…Oxidation leads to formation of cubic ZrO 2 and metallic Cu consistent with the hillocks in Fig. 15 (graphs from [6]). Table 2 Comparison of rotationally symmetric biaxial stresses (σ) and strains parallel to the surface (ε // ) as determined with independent XRD and FIB-DIC techniques (cf.…”

“…Fig.19. Top: A random pattern of Pt dots is a reference for the location of markers (green crosses) whose displacements are tracked with DIC during FIB (for abbreviations see Fig.18; graph from[6]). Bottom: snapshot from a movie of excavation of a column with FIB (left) and the engineering strain in x and y direction as calculated from the displacements recorded with DIC.…”

Influence of Oxidation on Structure, Performance, and Application of Metallic Glasses

“…[ 45 ] In addition, stress‐induced nonoxidizing elemental diffusion into microcracks can seal the cracks and lead to self‐repairing, which is beneficial for maintaining surface integrity. [ 46 ] Oxidation‐induced elemental redistribution can be utilized as a method to proactively adjust metallic glass chemical compositions and microstructures, for example, by forming designated matrix‐phase frameworks upon which to construct composite materials. Because conventional experimental techniques cannot track designated atomic motions, the available descriptions of elemental diffusion during metallic glass oxidation have been developed based on inferences drawn from elemental distribution snapshots.…”

“…[ 17 ] Hence, after prolonged metallic glass oxidation, multilayered oxides exhibiting distinct morphologies can be formed ( Figure ). [ 46 ]…”

A novel pathway for multiscale high-resolution time-resolved residual stress evaluation of laser-welded Eurofer97

“…However, requiring a stress-free reference is challenging, and the technique only characterizes type III residual strain. Ga + focused ion beam (FIB) and DIC method has proven reliable in measuring the timeresolved strain relaxation in titanium alloys, metallic glasses, and martensitic steels (19)(20)(21). Although it measures residual strain without a stress-free reference, two notable limitations exist, which affect residual strain measurements: (i) the accelerated Ga + ions damage the material by amorphizing, creating defects and increasing dislocation density, which is likely to induce residual stress during the Ga + FIB milling process (22), and (ii) to achieve a multiscale residual stress characterization of metallic alloys, the low removal rates of Ga + FIB usually limit the milling areas to a few micrometers, which largely achieves only type III residual stress (20).…”