Solute segregation and deviation from bulk thermodynamics at nanoscale crystalline defects.

ABSTRACT: It has long been known that solute segregation at crystalline defects can have profound effects on material properties. Nevertheless, quantifying the extent of solute segregation at nanoscale defects has proven challenging due to experimental limitations. A combined experimental and first-principles approach has been used to study solute segregation at extended intermetallic phases ranging from 4 to 35 atomic layers in thickness. Chemical mapping by both atom probe tomography and high-resolution scanning transmission electron microscopy demonstrates a markedly different composition for the 4-atomic-layer-thick phase, where segregation has occurred, compared to the approximately 35-atomic-layer-thick bulk phase of the same crystal structure. First-principles predictions of bulk free energie

SUBMITTER: Titus MS 

PROVIDER: S-EPMC5176347 | biostudies-literature | 2016 Dec

REPOSITORIES: biostudies-literature