Systematic procedures for atom‐probe field‐ion microscopy studies of grain boundary segregation

1992 ◽  
Vol 63 (9) ◽  
pp. 4071-4079 ◽  
Author(s):  
B. W. Krakauer ◽  
D. N. Seidman
Keyword(s):  
Grain Boundary ◽  
Boundary Segregation ◽  
Atom Probe ◽  
Grain Boundary Segregation ◽  
Probe Field ◽  
Field Ion Microscopy ◽  
Ion Microscopy

scholarly journals Characterization of Phosphorus Segregation in Neutron-Irradiated Pressure Vessel Steels by Atom Probe Field Ion Microscopy

1994 ◽  
Vol 373 ◽  
Author(s):  
M. K. Miller ◽  
R. Jayaram ◽  
K.F. Russell
Keyword(s):  
Pressure Vessel ◽  
Boundary Segregation ◽  
Atom Probe ◽  
Probe Field ◽  
Phosphorus Segregation ◽  
Field Ion Microscopy ◽  
Narrow Region ◽  
Pressure Vessel Steels ◽  
Ion Microscopy

AbstractAn atom probe field ion microscopy characterization of A533B and Russian VVER 440 and 1000 pressure vessel steels has been performed to determine the phosphorus coverage of grain and lath boundaries. Field ion micrographs of grain and lath boundaries have revealed that they are decorated with a semi-continuous film of discrete brightly-imaging precipitates that were identified as molybdenum carbonitride precipitates. In addition, extremely high phosphorus levels were measured at the boundaries. The phosphorus segregation was found to be confined to an extremely narrow region indicative of monolayer-type segregation. The phosphorus coverages determined from the atom probe results of the unirradiated materials were in excellent agreement with predictions based on McLean's equilibrium model of grain boundary segregation. The boundary phosphorus coverage of a neutron-irradiated weld material was significantly higher than that observed in the unirradiated material.

An atom probe tomography study of grain boundary segregation in nanocrystalline Ni-W

2005 ◽  
Vol 903 ◽  
Author(s):  
Andrew Detor ◽  
Michael K. Miller ◽  
Christopher A. Schuh
Keyword(s):  
Grain Boundary ◽  
Atom Probe Tomography ◽  
Boundary Segregation ◽  
Atom Probe ◽  
Solute Segregation ◽  
Grain Boundary Segregation ◽  
Distribution Analysis ◽  
Grain Sizes ◽  
Composition Fluctuations ◽  
20 Nm

AbstractAtom probe tomography is used to observe the solute distribution in electrodeposited nanocrystalline Ni-W alloys with three different grain sizes (3, 10, and 20 nm) and the results are compared with atomistic computer simulations. The presence of grain boundary segregation is confirmed by detailed analysis of composition fluctuations in both experimental and simulated structures, and its extent quantified by a frequency distribution analysis. In contrast to other nanocrystalline alloys, the present Ni-W alloys exhibit only a subtle amount of solute segregation to the intergranular regions. This finding is consistent with quantitative predictions for these alloys based upon a thermodynamic model of grain boundary segregation.

scholarly journals Atom Probe Tomography investigations on grain boundary segregation in polycrystalline Ti(C,N) and Zr(C,N) CVD coatings

2019 ◽  
Vol 162 ◽  
pp. 335-340 ◽  
Author(s):  
Idriss El Azhari ◽  
Jenifer Barrirero ◽  
José García ◽  
Flavio Soldera ◽  
Luis Llanes ◽  
...  
Keyword(s):  
Grain Boundary ◽  
Atom Probe Tomography ◽  
Boundary Segregation ◽  
Atom Probe ◽  
Grain Boundary Segregation
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