Grain boundary in NbCo(Pt)Sn half-Heusler compounds: segregation and solute drag on grain boundary migration

2022 ◽  
pp. 117604
Author(s):  
Ting Luo ◽  
Dominique Mangelinck ◽  
Federico Serrano-Sánchez ◽  
Chenguang Fu ◽  
Claudia Felser ◽  
...  
Keyword(s):  
Grain Boundary ◽  
Boundary Migration ◽  
Solute Drag ◽  
Grain Boundary Migration ◽  
Heusler Compounds

Solute Drag and Entropy Production - Two Approaches to the Same Phenomenon

2004 ◽  
Vol 467-470 ◽  
pp. 3-10 ◽  
Author(s):  
Mats Hillert
Keyword(s):  
Gibbs Energy ◽  
Grain Boundary ◽  
Phase Transformations ◽  
Entropy Production ◽  
Grain Growth ◽  
Historical Development ◽  
Boundary Migration ◽  
Solute Drag ◽  
Grain Boundary Migration ◽  
Solute Atoms

The historical development of the two approaches to the interaction between solute atoms and a migrating interface, based on dissipation of Gibbs energy and on solute drag, are reviewed and compared. In the way the solute drag was formulated long ago for recrystallization and grain growth, it does not apply to phase transformations. With a new solute drag equation, which was recently proposed, it turns out that the two approaches are completely equivalent for phase transformations as well as grain boundary migration.

Solute drag assessment of grain boundary migration in Au

2021 ◽  
pp. 117473
Author(s):  
Ayush Suhane ◽  
Daniel Scheiber ◽  
Maxim Popov ◽  
Vsevolod I. Razumovskiy ◽  
Lorenz Romaner ◽  
...  
Keyword(s):  
Grain Boundary ◽  
Boundary Migration ◽  
Solute Drag ◽  
Grain Boundary Migration

A New Approach to Solute Effect on Grain Boundary Migration

2013 ◽  
Vol 753 ◽  
pp. 131-134
Author(s):  
Yan Huang
Keyword(s):  
Grain Boundary ◽  
Boundary Migration ◽  
Boundary Energy ◽  
Boundary Segregation ◽  
Solute Drag ◽  
Solute Concentration ◽  
Irreversible Thermodynamics ◽  
Grain Boundary Migration ◽  
Grain Boundary Mobility ◽  
Alternative Approach

Solute drag theory is critically revisited and an alternative approach is presented to account for the effect of solute elements on grain boundary migration during annealing. A fundamental new concept is introduced in the model that, in the linear range of irreversible thermodynamics, solute atoms segregated in a grain boundary will not lag behind when the boundary migrates. While lagging behind is the very essential assumption for the solute drag theory. Instead of blaming the lagging behind, the mobility drop due to solute addition is attributed to the decrease in boundary energy as a result of boundary segregation. According to this model, grain boundary mobility is dependent on solute concentration rather than migration rate. The predictions of the model are compared with experimental results, with a good agreement.

Measurement of solute segregation to grain boundaries in the AEM: A review

1988 ◽  
Vol 46 ◽  
pp. 606-607
Author(s):  
D. B. Williams ◽  
A. D. Romig
Keyword(s):  
Grain Boundary ◽  
Grain Boundaries ◽  
Boundary Migration ◽  
Grain Boundary Migration ◽  
Boundary Misorientation ◽  
Collector Plate ◽  
Segregation Process ◽  
Grain Boundary Misorientation ◽  
Structure Boundary ◽  
Equilibrium Segregation

The segregation of solute or imparity elements to grain boundaries can occur by three well-defined processes. The first is Gibbsian segregation in which an element of minimal matrix solubility confines itself to a monolayer at the grain boundary. Classical examples include Bi in Cu and S or P in Fe. The second process involves the depletion of excess matrix solute by volume diffusion to the boundary. In the boundary, the solute atoms diffuse rapidly to precipitates, causing them to grow by the ‘collector-plate mechanism.’ Such grain boundary diffusion is thought to initiate “Diffusion-Induced Grain Boundary Migration,” (DIGM). This process has been proposed as the origin of eutectoid transformations or discontinuous grain boundary reactions. The third segregation process is non-equilibrium segregation which result in a solute build-up around the boundary because of solute-vacancy interactions.All of these segregation phenomena usually occur on a sub-micron scale and are often affected by the nature of the grain boundary (misorientation, defect structure, boundary plane).

Domain coarsening by grain boundary migration in ordered Ni4Mo

1986 ◽  
Vol 44 ◽  
pp. 560-561
Author(s):  
K. Vasudevan ◽  
H. P. Kao ◽  
C. R. Brooks ◽  
E. E. Stansbury
Keyword(s):  
Grain Boundary ◽  
Grain Boundaries ◽  
Short Range ◽  
Boundary Migration ◽  
Grain Boundary Migration ◽  
Rapid Cooling ◽  
Temperature Range ◽  
Fee Structure ◽  
Domain Coarsening ◽  
Boundary Reaction

The Ni4Mo alloy has a short-range ordered fee structure (α) above 868°C, but transforms below this temperature to an ordered bet structure (β) by rearrangement of atoms on the fee lattice. The disordered α, retained by rapid cooling, can be ordered by appropriate aging below 868°C. Initially, very fine β domains in six different but crystallographically related variants form and grow in size on further aging. However, in the temperature range 600-775°C, a coarsening reaction begins at the former α grain boundaries and the alloy also coarsens by this mechanism. The purpose of this paper is to report on TEM observations showing the characteristics of this grain boundary reaction.

STUDY OF THE GRAIN BOUNDARY MIGRATION IN A TRICRISTAL PURE ICE WITH BUBBLES

Anales AFA ◽  
2019 ◽  
Vol 30 (3) ◽  
pp. 47-51
Author(s):  
P.I. Achával ◽  
C. L. Di Prinzio
Keyword(s):  
Monte Carlo ◽  
Grain Boundary ◽  
Numerical Simulations ◽  
Triple Junction ◽  
Boundary Migration ◽  
Optical Microscope ◽  
Physical Parameters ◽  
Grain Boundary Migration

In this paper the migration of a grain triple junction in apure ice sample with bubbles at -5°C was studied for almost 3hs. This allowed tracking the progress of the Grain Boundary (BG) and its interaction with the bubbles. The evolution of the grain triple junction was recorded from successive photographs obtained witha LEICA® optical microscope. Simultaneously, numerical simulations were carried out using Monte Carlo to obtain some physical parameters characteristic of the BG migration on ice.

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