Grain boundary segregation and diffusion in Ag-S solid solution

1979 ◽  
Vol 27 (12) ◽  
pp. 1849-1854 ◽  
Author(s):  
B. Aufray ◽  
F. Cabane-Brouty ◽  
J. Cabane
Keyword(s):  
Solid Solution ◽  
Grain Boundary ◽  
Boundary Segregation ◽  
Grain Boundary Segregation ◽  
And Diffusion

Retardation Effect of Grain Boundary Segregation on Grain Boundary Diffusion

2006 ◽  
Vol 249 ◽  
pp. 167-172 ◽  
Author(s):  
Boris S. Bokstein ◽  
Alexey Rodin ◽  
A.N. Smirnov
Keyword(s):  
Solid Solution ◽  
Diffusion Coefficient ◽  
Grain Boundary ◽  
Boundary Diffusion ◽  
Boundary Segregation ◽  
Solute Concentration ◽  
Grain Boundary Diffusion ◽  
Grain Boundary Segregation ◽  
Retardation Effect ◽  
Ordering Transition

The effect of grain boundary segregation (GBS) on grain boundary diffusion (GBD) is analyzed in frame of the new model. This model supposes the formation of the specific “nuclei” in a grain boundary (GB) solid solution. Their composition is close to that of the nearest phase in grain in equilibrium with solid solution in grain. These GB “nuclei” form after the same solubility as in the bulk is reached. The size of these “nuclei” is close to an atomic size and consequently the new interfaces inside the two-dimensional GB are not formed. As the solute concentration in the bulk increases the solute concentration in GB increases as well, but only due to the increase of the “nuclei” fraction. At the same time the solute concentration in a disordered part of GB solid solution remains constant. The fraction of this part decreases. The retardation effect of GBS on GBD is connected with the ordering transition, the “nuclei” formation. A diffusion coefficient (D) in an ordered part of solid solution is close to the diffusion coefficient in a bulk phase. As a rule, it is less than a diffusion coefficient in a disordered part. The growth of an ordered part of GB solid solution (the fraction of the “nuclei”) leads also to the dependence of D on the solute concentration and to the additional curvature of the diffusion profiles.

Effects of solid solution and grain-boundary segregation of Mo on hydrogen embrittlement in 32MnB5 hot-stamping steels

2021 ◽  
Vol 207 ◽  
pp. 116661
Author(s):  
Jisung Yoo ◽  
Min Chul Jo ◽  
Min Cheol Jo ◽  
Seongwoo Kim ◽  
Sang-Heon Kim ◽  
...  
Keyword(s):  
Solid Solution ◽  
Hydrogen Embrittlement ◽  
Grain Boundary ◽  
Hot Stamping ◽  
Boundary Segregation ◽  
Grain Boundary Segregation

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.

Sign in / Sign up

Export Citation Format

Share Document