Grain boundary segregation and secondary-phase transition of (La,Nb)-codoped TiO2 ceramic

2016 ◽  
Vol 42 (10) ◽  
pp. 11584-11592 ◽  
Author(s):  
Ji-Kang Yan ◽  
Kun-Yong Kang ◽  
Jing-Hong Du ◽  
Guo-You Gan ◽  
Jian-Hong Yi
Keyword(s):  
Phase Transition ◽  
Grain Boundary ◽  
Boundary Segregation ◽  
Secondary Phase ◽  
Grain Boundary Segregation ◽  
Codoped Tio2 ◽  
Tio2 Ceramic

Segregation and Phase Transitions in Grain Boundaries

2019 ◽  
Vol 22 ◽  
pp. 160-169
Author(s):  
Boris Bokstein ◽  
Alexey Rodin ◽  
Aleksei Itckovich ◽  
Leonid Klinger
Keyword(s):  
Phase Transition ◽  
Phase Transitions ◽  
Grain Boundary ◽  
Grain Boundaries ◽  
Computer Modeling ◽  
Boundary Segregation ◽  
Short Description ◽  
Grain Boundary Segregation ◽  
Atomic Interactions

The paper is devoted to some properties of grain boundaries: Segregation and concentration phase transitions – two important consequences of atomic interactions in grain boundaries. Except of a short description the Gibbs method of surface excesses and grain boundary segregation isotherms with the limited number of segregation sites in grain boundary, the paper concentrates on the effects of complexes formation, including thermodynamic and computer modeling, and concentration phase transition in the grain boundaries in systems with restricted solubility and intermediate compounds.

Is the Compensation Effect a Phase Transition?

2008 ◽  
Vol 138 ◽  
pp. 339-346 ◽  
Author(s):  
Pavel Lejček
Keyword(s):  
Phase Transition ◽  
Grain Boundary ◽  
Linear Dependence ◽  
Compensation Effect ◽  
Boundary Segregation ◽  
Grain Boundary Segregation ◽  
Close Relationship ◽  
Enthalpy And Entropy

The compensation effect, i.e. the linear dependence between characteristic enthalpy and entropy, has been frequently described in many fields of science and its close relationship to a phase transition is often assumed. In this paper it is shown for example of grain boundary segregation that the compensation effect principally differs from the phase transition although they can occasionally occur at the same temperature.

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.

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 Grain Boundary Segregation in UFG Alloys Processed by Severe Plastic Deformation

2012 ◽  
Vol 14 (11) ◽  
pp. 968-974 ◽  
Author(s):  
Xavier Sauvage ◽  
Artur Ganeev ◽  
Yulia Ivanisenko ◽  
Nariman Enikeev ◽  
Maxim Murashkin ◽  
...  
Keyword(s):  
Plastic Deformation ◽  
Grain Boundary ◽  
Severe Plastic Deformation ◽  
Boundary Segregation ◽  
Grain Boundary Segregation

Boron Grain Boundary Segregation in a Heat Treatable Steel

2015 ◽  
Vol 160 (5) ◽  
pp. 204-208 ◽  
Author(s):  
Phillip Haslberger ◽  
Christoph Turk ◽  
Katharina Babinsky ◽  
Devrim Caliskanoglu ◽  
Helmut Clemens ◽  
...  
Keyword(s):  
Grain Boundary ◽  
Boundary Segregation ◽  
Grain Boundary Segregation
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