....about MICRESS®

The properties of almost any material are largely determined by its structure and especially by its microstructure.

MICRESS® - the MICRostructure Evolution Simulation Software - is a software enabling the time- and space-resolved calculation of microstructure formation, especially in metallurgical systems. The software is based on a generalized multiphase-field concept for multiphase and multicomponent systems (see J.Eiken, B.Böttger, I.Steinbach, 2006). The historic grounds of the used phase-field concept were developed by ACCESS scientists in 1995 (see I.Steinbach, F.Pezzolla, B.Nestler, M.Seeßelberg, R.Prieler, G.J.Schmitz, J.L.L.Rezende, 1995). The core module which includes phase-field and diffusion modelling is combined with fluid flow, stress and temperature modules. The software is maintained and distributed by ACCESS e.V., a non-profit research center at the Aachen University of Technology (RWTH). The revenues of MICRESS® sales are re-invested into further development of the code.

The evolution of a microstructure is essentially governed by thermodynamic equilibria, diffusion and curvature. The strength of the MICRESS® code is that these aspects are treated simultaneously:



(energy scale)


(time scale)



(length scale)



MICRESS® applies a multiphase field method for multicomponent alloys and enables the treatment of multiphase, multigrain and multicomponent problems in the fields of solidification, grain growth, recrystallization or solid state phase transformations. All these phenomena can be addressed using this versatile and general tool. In the case of multicomponent alloys, the required thermodynamic data can either be provided in the form of locally linearized phase diagrams, or by direct coupling to thermodynamic data sets via a special TQ interface being developed in collaboration with Thermo-Calc AB, Stockholm. 

The software covers phase evolution, solutal and thermal diffusion and transformation strain in solid state. 2D and 3D simulations are possible and the size of the simulation domain, the number of grains, phases and components are chiefly restricted by available memory size and CPU speed. 

Coupling to stress/strain fields has been implemented into MICRESS® since version 5.2 alongside routines for the treatment of multicomponent diffusion and coupling to diffusion databases. 64 bit versions of MICRESS® are available from version 6.0 being released in October 2011.

A MICRESS® interface to the platform MuPIF (http://mech.fsv.cvut.cz/mupif) has been developed in the frame of the ongoing MMP project (Multiscale Modelling Platform: Smart design of nano-enabled products in green technologies, http://mmp-project.eu, 2014-2016). More ...