To be specific, in the selected-area electron diffraction pattern, CSRO may give off the extra superlattice scattering, usually in the form of diffuse disks with the diameters substantially larger than those of Bragg spots of base lattices. For the latter, electron diffraction seems the most appropriate way capable of directly digging out the direct evidence of CSRO. high-resolution, HR) transmission electron microscope (TEM). One is indirect, such as the fitting of the X-ray or neutron data as well as the three-dimensional atom probe tomography (3D-APT) while the other is the ‘seeing-is-believing’ strategy by the direct observation of CSRO using the state-of-the-art (e.g. To demonstrate CSRO, there are two kinds of experimental techniques.
#Crystalmaker electron diffraction pattern example how to#
So far how to identify convincingly CSRO becomes undisputedly the top question. CSRO is considered as an iconic entities inherent in H/MEA, playing a key role in dislocation behaviors, strain hardening, and macroscopic mechanical properties such as strength and ductility. In this sense, CSRO is usually at the sub-nanoscale in size, without lattice periodicity. By definition, CSRO refers to the preference/avoidance of some species in the alloy away from atomic fractions expected for random mixing, but the chemical order is short-ranged such that it prevails only in the first and the next couple of nearest-neighbor atomic shells around the atom at center. The chemical short-range order (CSRO) is the incipient LCO in H/MEAs, akin to the counterparts in the conventional alloys. In H/MEA, constituent species would be much likely to make enthalpic interactions large enough locally such that the local chemical order (LCO) is induced in the basal solid solution. High-/medium-entropy alloys (H/MEA) are the complex concentrated solid solution composed of multi-principal elements, showing an improved synergy between strength and ductility.
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