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Multiscale modeling for fusion and fission materials
The project is broken down in Domains and Work-Packages. The Domains are defined in terms of approaches and scales, clusters of Work-Packages contribute to each of the objectives.
The distinctive feature of the M4F project is its combination of multiscale physical modelling and advanced microstructural and mechanical characterisation using several complementary techniques. This enables a full comprehension of the physics that drive the change of properties under irradiation of F/M steels, including in addition a direct comparison between the effects of neutron and ion irradiation. Models and experiments feed each other: models provide a rationalisation of experimental observations based on fundamental physical laws and possible mechanisms; in turn, experimental data that cover as many microstructural features and deformation modes as possible allow the validation and the calibration of the models.
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The models used in the project cover a wide range of scales and methods. 19 different codes are used in the projectTable 1.
Specific materials were chosen for the experimental programme, namely F/M model alloys (with 9 and 14%Cr, the latter in order to observe α' precipitation, with or without addition of minor solutes) and one steel, Eurofer97 Table 2 and Table 3. The first table shows that part of these materials have been characterised through several work-packages for the specific feature of interest, while part have been the focus of study in only one or two WPs.
The model alloys were chosen because their simpler chemical composition and controlled microstructure (fully ferritic versus largely martensitic) enables the effects of different variables to be separated. Fe is included because it is always a good reference to understand the effects of the alloying elements that are added to it. The steel, Eurofer97, in contrast, provides data for a material of technological interest, the behaviour of which is interpreted based also on the observations made on the model alloys, after irradiation under the same conditions.
The experiments performed are summarised in Table 4.
