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FP6

DIGIMAT — Result In Brief

Project ID: 17105
Funded under: FP6-NMP
Country: France

A multiscale modelling approach for advancing alloys

Better kinds of alloys without crystallisation have the potential to improve many products and applications in several industries. Efforts have been made to address the challenge of recrystallisation.
A multiscale modelling approach for advancing alloys
Alloys made of two or more metals are often stronger, lighter and more efficient for use in industry and a wide variety of products. The latter range from cars and aeroplanes to electronics and medical devices.

Manufacturing of alloys is often plagued by a phenomenon of recrystallisation, which can affect the quality of the end product. However, the fluctuating state of recrystallisation has made it difficult to outline the exact mechanisms of this phenomenon and to address it.

The EU-funded project 'Multiscale modelling of recrystallization in metals based on a digital material framework' (Digimat) investigated ways to remedy the problem posed by recrystallisation. It proposed multiscale modelling using digital media to understand recrystallisation fully.

Digimat partners believed that digital representation could be converted into elements used to simulate plastic deformation and subsequent recrystallisation. With this in mind, they developed virtual software to construct, visualise and analyse 3D microstructures and how they mesh together. Digimat built elastic-viscoplastic crystal plasticity models of deformation and validated the model.

Team members also studied the characteristics of dislocation motion, grain boundary migration and nucleation phenomena through the new modelling software. Diffraction experiments were then performed to study 3D polycrystalline microstructures and recrystallisation during heat treatment.

While the project faced many obstacles in realising its goals, some valuable results were published and much of the research done promises to facilitate efforts to improve alloys.

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