Influence of Defect Thermodynamics on Self-Diffusion in Complex Concentrated Alloys with Chemical Ordering

Deformation mechanisms in high entropy alloys: a minireview of short-range order effects

“…The statistics of these VFE and VME distributions have been reported in several studies. 56,82–89 These variations in vacancy defect energies have been interpreted experimentally through the changes in activation volumes measured during nanoindentation experiments, as discussed in Nieh and co-workers. 90,91…”

“…The statistics of these VFE and VME distributions have been reported in several studies. 56,[82][83][84][85][86][87][88][89] These variations in vacancy defect energies have been interpreted experimentally through the changes in activation volumes measured during nanoindentation experiments, as discussed in Nieh and co-workers. 90,91 The effects of SRO on the vacancy defect energies may be understood from a similar gradient-based perspective as taken for structural considerations.…”

“…Diffusivity (as a companion property to vacancy migration) represents one such property of great interest due to its relevance in irradiation resistance and creep. New studies have revealed the beneficial role that SRO holds in slowing diffusion kinetics through defect trapping, 23,58,84,92,93 which can be explained by SRO-induced increases to forward vacancy migration barriers (see Fig. 6c).…”

“…6c). However, Manzoor and Zhang 84 note that the presence of SRO does not ensure lower diffusivities. That is, while SRO may diminish vacancy migration, total diffusion may rise in aggregate due to SRO-induced increases to the equilibrium vacancy concentration.…”