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DICTRA

DICTRA
Definition:Diffusion Controlled Transformation; simulation software for diffusion and phase transformations
Explanation:Dictra is a simulation software for diffusion controlled reactions in multi-component alloys. The calculation is based on a thermodynamic database and an atomic mobility database. Solutions are obtained through the application of numerical methods in a one dimensional geometry.

Some applications of Dictra include the simulation of:
(i) microsegregation, during solidification,
(ii) homogenization,
(iii) growth/dissolution of precipitates,
(iv) coarsening of precipitates, and
(v) diffusion controlled phase transformations, e.g. ferrite to austenite in steels.
Picture /
Figure /
Diagram:

Evolution of the aluminum concentration over time in a Fe-23Mn-0.3C-4Al (wt%) alloy. Cooling rate 5 K s-1. Plateau on the left side (at 60 s) corresponds to the residual delta phase.
SFB-Link:Thermodynamic models developed in A3 (in collaboration A2, that supplies ab initio data) can be utilized for Thermo-Calc calculations. These models are also used in A8 (phase field model) and to investigate experimental results obtained in the project B1.
References:Mats Hillert, Phase Equilibria, Phase Diagrams and Phase transformations, 2008, Cambridge University Press.
http://www.thermocalc.com/products-services/software/dictra/