Influence of bulk composition on grain boundary segregation inB2Fe−Al:An atomic-scale simulation study

2001 ◽  
Vol 64 (17) ◽  
Author(s):  
Rémy Besson ◽  
Alexandre Legris ◽  
Joseph Morillo
Keyword(s):  
Grain Boundary ◽  
Simulation Study ◽  
Bulk Composition ◽  
Boundary Segregation ◽  
Atomic Scale ◽  
Grain Boundary Segregation

Atomic Scale Characterisation of Electrodeposited Nanocrystalline Ni-P Alloys

1999 ◽  
Vol 581 ◽  
Author(s):  
Matthias Abraham ◽  
Mattias Thuvandert ◽  
Helen M. Lane ◽  
Alfred Cerezo ◽  
George D.W. Smith
Keyword(s):  
Heat Treatment ◽  
Grain Boundary ◽  
Grain Boundaries ◽  
Three Dimensional ◽  
Boundary Segregation ◽  
Atom Probe ◽  
Atomic Scale ◽  
Grain Boundary Segregation ◽  
P Concentration

ABSTRACTNanocrystalline Ni-P alloys produced by electrodeposition have been characterised by three-dimensional atom probe (3DAP) analysis. In the as-deposited materials, there are indications of some variation in P concentration between grains and segregation to grain boundaries. After heat treatment however, strong grain boundary segregation and the formation of Ni3P precipitates have been observed.

Atomic-Scale Quantification of Grain Boundary Segregation in Nanocrystalline Material

2014 ◽  
Vol 112 (12) ◽  
Author(s):  
M. Herbig ◽  
D. Raabe ◽  
Y. J. Li ◽  
P. Choi ◽  
S. Zaefferer ◽  
...  
Keyword(s):  
Grain Boundary ◽  
Nanocrystalline Material ◽  
Boundary Segregation ◽  
Atomic Scale ◽  
Grain Boundary Segregation

Free Energy Simulation of Grain Boundary Segregation and Thermodynamics In Ni3−xAl1+x

1990 ◽  
Vol 213 ◽  
Author(s):  
R. Najafabadi ◽  
H. Y. Wang ◽  
D. J. Srolovitzt ◽  
R. LeSar
Keyword(s):  
Free Energy ◽  
Low Temperature ◽  
Grain Boundary ◽  
Bulk Composition ◽  
Boundary Segregation ◽  
Simulation Method ◽  
Energy Simulation ◽  
Grain Boundary Segregation ◽  
Free Energies ◽  
Increasing Temperature

ABSTRACTThe free energy simulation method is employed to study segregation to Σ5 and Σ13 (001) twist grain boundaries and their free energies in ordered Ni3−xAl1+x. In the temperature range studied (300–900K), it is shown that there is almost no segregation, strong Al segregation, and weak Ni segregation to the grain boundary for the stoichiometric, Al-rich, and Ni-rich bulk compositions respectively. It is also shown that the segregation is limited to a few (002) planes around the grain boundary and its magnitude decreases with increasing temperature. For Al-rich bulk composition, it is demonstrated that segregation at low temperature substantially lowers the grain boundary free energy.

Atomic scale study of grain boundary segregation before carbide nucleation in Ni–Cr–Fe Alloys

2013 ◽  
Vol 439 (1-3) ◽  
pp. 57-64 ◽  
Author(s):  
Hui Li ◽  
Shuang Xia ◽  
Wenqing Liu ◽  
Tingguang Liu ◽  
Bangxin Zhou
Keyword(s):  
Grain Boundary ◽  
Boundary Segregation ◽  
Atomic Scale ◽  
Grain Boundary Segregation ◽  
Fe Alloys

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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