Grain-boundary segregation and dynamic solute drag theory—A phase-field approach

2007 ◽  
Vol 55 (3) ◽  
pp. 955-960 ◽  
Author(s):  
Klara Grönhagen ◽  
John Ågren
Keyword(s):  
Grain Boundary ◽  
Phase Field ◽  
Boundary Segregation ◽  
Solute Drag ◽  
Grain Boundary Segregation ◽  
Field Approach

Irradiation Assisted Grain Boundary Segregation in Steels

2006 ◽  
Vol 981 ◽  
Author(s):  
Zheng Lu ◽  
Roy G Faulkner
Keyword(s):  
Grain Boundary ◽  
Boundary Segregation ◽  
Analytical Techniques ◽  
Solute Drag ◽  
Grain Boundary Segregation ◽  
Rate Theory ◽  
Comprehensive Information ◽  
Fusion Applications ◽  
Radiation Induced ◽  
Reactor Pressure

AbstractThe understanding of radiation-induced grain boundary segregation (RIS) has considerably improved over the past decade. New models have been introduced and much effort has been devoted to obtaining comprehensive information on segregation from the literature. Analytical techniques have also improved so that chemical analysis of layers 1 nm thick is almost routine. This invited paper will review the major methods used currently for RIS prediction: namely, Rate Theory, Inverse Kirkendall, and Solute Drag approaches. A summary is made of the available data on phosphorus RIS in reactor pressure vessel (RPV) steels. This will be discussed in the light of the predictions of the various models in an effort to show which models are the most reliable and easy to use for forecasting P segregation behaviour in steels. A consequence of RIS in RPV steels is a radiation induced shift in the ductile to brittle transition temperature (DBTT). It will be shown how it is possible to relate radiation-induced P segregation levels to DBTT shift. Examples of this exercise will be given for RPV steels and for ferritic steels being considered for first wall fusion applications. Cr RIS in high alloy stainless steels and associated irradiation-assisted stress corrosion cracking (IASCC) will be briefly discussed.

scholarly journals The role of grain boundary character in solute segregation and thermal stability of nanocrystalline Pt–Au

Nanoscale ◽  
2021 ◽  
Vol 13 (6) ◽  
pp. 3552-3563
Author(s):  
Christopher M. Barr ◽  
Stephen M. Foiles ◽  
Malek Alkayyali ◽  
Yasir Mahmood ◽  
Patrick M. Price ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Grain Boundary ◽  
Boundary Segregation ◽  
Solute Drag ◽  
Solute Segregation ◽  
Grain Boundary Segregation ◽  
Grain Boundary Character ◽  
Service Conditions ◽  
Thermal Stability Of

In nanocrystalline alloys, the anisotropy in grain boundary segregation and its impact on dynamic solute drag plays a key role in the thermal stability of these systems during processing treatments or under service conditions.

Revealing the effect of grain boundary segregation on Li ion transport in polycrystalline anti-perovskite Li3ClO: a phase field study

2020 ◽  
Vol 22 (5) ◽  
pp. 3030-3036 ◽  
Author(s):  
Kun Shen ◽  
Yixuan Wang ◽  
Jun Zhang ◽  
Yi Zong ◽  
Gengwei Li ◽  
...  
Keyword(s):  
Grain Boundary ◽  
Ion Transport ◽  
Field Study ◽  
Phase Field ◽  
Boundary Segregation ◽  
Effective Diffusivity ◽  
Grain Boundary Segregation ◽  
Negative Contribution ◽  
Grain Sizes ◽  
Li Ion

Phase field calculated effective diffusivity Deff of Li vacancy in anti-perovskite Li3OCl is shown as a function of average grain sizes. Li vacancy segregation reinforces the negative contribution of grain boundaries on the overall Li diffusion.

Grain boundary segregation in metals

1992 ◽  
Vol 50 (2) ◽  
pp. 1204-1205
Author(s):  
C.L. Briant
Keyword(s):  
Fracture Surface ◽  
Grain Boundary ◽  
Grain Boundaries ◽  
Material Properties ◽  
Electron Spectroscopy ◽  
High Vacuum ◽  
Boundary Segregation ◽  
Grain Boundary Segregation ◽  
Local Concentration ◽  
The One

Grain boundary segregation is the process by which solute elements in a material diffuse to the grain boundaries, become trapped there, and increase their local concentration at the boundary over that in the bulk. As a result of this process this local concentration of the segregant at the grain boundary can be many orders of magnitude greater than the bulk concentration of the segregant. The importance of this problem lies in the fact that grain boundary segregation can affect many material properties such as fracture, corrosion, and grain growth.One of the best ways to study grain boundary segregation is with Auger electron spectroscopy. This spectroscopy is an extremely surface sensitive technique. When it is used to study grain boundary segregation the sample must first be fractured intergranularly in the high vacuum spectrometer. This fracture surface is then the one that is analyzed. The development of scanning Auger spectrometers have allowed researchers to first image the fracture surface that is created and then to perform analyses on individual grain boundaries.

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