Study of microstrain in rapidly solidified structures of hypercooled Co₈₀Pd₂₀ alloys

Abstract

Applying fluxing method, hypercooling was achieved in Co80Pd20 alloys. The rapidly solidified microstructures and substructures of hypercooled Co80Pd20 alloys, subjected to rapid quenching and natural cooling after recalescence, have been studied. Transmission electron microscopy was used to investigate the substructures such as dislocations in the as solidified microstructures. X-ray diffraction line profile analysis was used for illuminating and determining the microstrain due to rapid solidification in the as solidified microstructures. In the undercooling range studied, the microstrain in the rapidly solidified structures increases with increasing undercooling. Quenching immediately after rapid solidification is helpful to preserving the microstrain in the microstructures.

Stacking Effects on Electron–Phonon Coupling in Layered Hybrid Perovskites via Microstrain Manipulation

“…Generally, the fwhm of the XRD peak is a yardstick to measure the crystal distortion in terms of microstrain . Growth at the high cooling rate, the crystals exhibit larger microstrain due to the severer lattice imperfection, which is similar to that of metal solidification processing . With a high cooling rate, the organic cations are probable to have less relax time to construct perfect lattice in the interior of the crystals.…”

“…41 Growth at the high cooling rate, the crystals exhibit larger microstrain due to the severer lattice imperfection, which is similar to that of metal solidification processing. 42 With a high cooling rate, the organic cations are probable to have less relax time to construct perfect lattice in the interior of the crystals. It thus leads to more local lattice distortion, which is responsible for higher microstrain as reflected in the XRD peak widening, and this further explains the broadening of the emission peaks (Figure 2a).…”

Rapid phase transformation under local non-equilibrium diffusion conditions

“…But when the interface velocity V increases, the transformation process begins to deviate from equilibrium. 1–97 The non-equilibrium nature of phase transformation has made it possible to produce supersaturated solid solutions, metastable compounds, highly disordered intermetallic compounds, ceramic materials, glasses and other advanced engineering materials with unique characteristics. 1–97 The most obvious manifestation of the deviation from local equilibrium during rapid alloy solidification is solute trapping, which reduces the solute segregation at the solid/liquid interface.…”

“…1–97 The non-equilibrium nature of phase transformation has made it possible to produce supersaturated solid solutions, metastable compounds, highly disordered intermetallic compounds, ceramic materials, glasses and other advanced engineering materials with unique characteristics. 1–97 The most obvious manifestation of the deviation from local equilibrium during rapid alloy solidification is solute trapping, which reduces the solute segregation at the solid/liquid interface. 1–37 The solute trapping phenomenon is often accompanied by grain refinement 7–9,11,14–17 and is analogous to disorder trapping 14–17 and density trapping.…”

Computation of Micro-Strains in Cold Formed Steels- FEA Approach

“…The microstrains in the sample were determined from XRD pattern analysis based on line broadening. X L Xu [9] studied microstrain in rapidly solidified structures of hypercooled Co 80 pd 20 alloys. In the undercooling range studied, the microstrain in the rapidly solidified structures increases with increasing undercooling.…”