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.

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.

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 On the thermal stability and grain boundary segregation in nanocrystalline PtAu alloys

Materialia ◽  
2019 ◽  
Vol 6 ◽  
pp. 100298 ◽  
Author(s):  
P. Lu ◽  
F. Abdeljawad ◽  
M. Rodriguez ◽  
M. Chandross ◽  
D.P. Adams ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Grain Boundary ◽  
Boundary Segregation ◽  
Grain Boundary Segregation
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