The Effect of Grain and Phase Boundary Misorientation on Nucleation during Solid-state Phase Transformations in a Co-l5Fe Alloy

2008 ◽  
pp. 305-311 ◽  
Author(s):  
H. Landheer ◽  
S.E. Offerman ◽  
L.A.I. Kestens ◽  
T. Takeuchi ◽  
M. Enonioto ◽  
...  
Keyword(s):  
Solid State ◽  
Phase Boundary ◽  
Phase Transformations ◽  
Boundary Misorientation

On reaction in the solid state

1957 ◽  
Vol 239 (1217) ◽  
pp. 145-153 ◽  
Keyword(s):  
Solid State ◽  
Diffusion Process ◽  
Phase Boundary ◽  
Phase Transformations ◽  
Solid State Reaction ◽  
Minimum Temperature ◽  
Rate Theory ◽  
Reaction Sintering ◽  
Rate Law ◽  
Additive Reaction

Using the concept of phonon-lattice interaction, an expression is derived for the minimum temperature, T R , of a solid at which it may enter into solid-state reaction. This expression leads to a more precise idea of single-component reaction (sintering) temperatures than those given by Hüttig. Reaction between two different solids has been re-examined in the light of their physical and crystallographic properties. The rate law for such an additive reaction has been deduced from the quantum rate theory. It is concluded that crystallographic phase transformations and the formation of transitional superstructures constitute the phase-boundary processes and that the kinetics are governed by the dynamics of the diffusion process.

The use of high-resolution FESEM to study solid-state phase transformations and reactions

1994 ◽  
Vol 52 ◽  
pp. 1028-1029
Author(s):  
P. G. Kotula ◽  
D. D. Erickson ◽  
C. B. Carter
Keyword(s):  
Solid State ◽  
High Resolution ◽  
Phase Transformations ◽  
High Efficiency ◽  
Sol Gel ◽  
Quantitative Information ◽  
Solid State Reactions ◽  
Critical Dimensions ◽  
Backscattered Electrons ◽  
Backscattered Electron

High-resolution field-emission-gun scanning electron microscopy (FESEM) has recently emerged as an extremely powerful method for characterizing the micro- or nanostructure of materials. The development of high efficiency backscattered-electron detectors has increased the resolution attainable with backscattered-electrons to almost that attainable with secondary-electrons. This increased resolution allows backscattered-electron imaging to be utilized to study materials once possible only by TEM. In addition to providing quantitative information, such as critical dimensions, SEM is more statistically representative. That is, the amount of material that can be sampled with SEM for a given measurement is many orders of magnitude greater than that with TEM.In the present work, a Hitachi S-900 FESEM (operating at 5kV) equipped with a high-resolution backscattered electron detector, has been used to study the α-Fe2O3 enhanced or seeded solid-state phase transformations of sol-gel alumina and solid-state reactions in the NiO/α-Al2O3 system. In both cases, a thin-film cross-section approach has been developed to facilitate the investigation. Specifically, the FESEM allows transformed- or reaction-layer thicknesses along interfaces that are millimeters in length to be measured with a resolution of better than 10nm.

scholarly journals A review on the modeling and simulations of solid-state diffusional phase transformations in metals and alloys

2018 ◽  
Vol 5 ◽  
pp. 10 ◽  
Author(s):  
Xueyan Liu ◽  
Hongwei Li ◽  
Mei Zhan
Keyword(s):  
Solid State ◽  
Phase Transformations ◽  
Numerical Technique ◽  
Metals And Alloys ◽  
Analytical Models ◽  
Theoretical Research ◽  
Current Status ◽  
Advantages And Disadvantages ◽  
Simulation Techniques ◽  
Molecular Dynamics Methods

Solid-state diffusional phase transformations are vital approaches for controlling of the material microstructure and thus tailoring the properties of metals and alloys. To exploit this mean to a full extent, much effort is paid on the reliable and efficient modeling and simulation of the phase transformations. This work gives an overview of the developments in theoretical research of solid-state diffusional phase transformations and the current status of various numerical simulation techniques such as empirical and analytical models, phase field, cellular automaton methods, Monte Carlo models and molecular dynamics methods. In terms of underlying assumptions, physical relevance, implementation and computational efficiency for the simulation of phase transformations, the advantages and disadvantages of each numerical technique are discussed. Finally, trends or future directions of the quantitative simulation of solid-state diffusional phase transformation are provided.

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