English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

High entropy alloys (HEAs) have emerged as a new class of multicomponentmaterials, which have potential for high temperature applications. Phasestability and creep deformation, two key selection criteria for hightemperature materials, are predominantly influenced by the diffusion ofconstituent elements along the grain boundaries (GBs). For the first time, GBdiffusion of Ni in chemically homogeneous CoCrFeNi and CoCrFeMnNi HEAs ismeasured by radiotracer analysis using the $^{63}$Ni isotope. Atom probetomography confirmed the absence of elemental segregation at GBs that allowedreliable estimation of the GB width to be about 0.5 nm. Our GB diffusionmeasurements prove that a mere increase in number of constituent elements doesnot lower the diffusion rates in HEAs, but the nature of added constituentsplays a more decisive role. The GB energies in both HEAs are estimated at about0.8-0.9 J/m$^2$, they are found to increase significantly with temperature andthe effect is more pronounced for the CoCrFeMnNi alloy.

Radioactive isotopes reveal a non sluggish kinetics of grain boundary diffusion in high entropy alloys