MAFMA · MULTISCALE ANALYSIS OF FATIGUE IN Mg ALLOYS
Horizon 2020 — Marie Skłodowska-Curie Actions
- Duration
- 2019-09-01 → 2021-09-15
- EU contribution
- €170,122
- Participants
- 1
- Scheme
- MSCA-IF-EF-ST
Lines connect the coordinator with its partners.
Results in brief
MULTISCALE ANALYSIS OF FATIGUE IN Mg ALLOYS
Fatigue behavior of metallic alloys is controlled by the number of cycles necessary to nucleate a crack and that necessary to propagate the crack until a critical size. The former (including the propagation of very short cracks whose length is comparable to the grain size) is the dominant one in the case of high cycle fatigue and often very important in low cycle fatigue. It is also well established, from the qualitative viewpoint, that fatigue crack nucleation and the propagation is highly dependent on the microstructure (grain boundary, grain size, texture, twin, precipitates), while the quantitative influences of each microstructural feature is missing particularly in HCP metals. The objective of the MAFMA was to understand the deformation and fracture mechanisms of Mg alloys during cyclic deformation and to establish the effect of the microstructural features on the mechanisms of fatigue crack nucleation in Mg alloys using a combination of in-situ mechanical tests and simulations at different length scales within the spirit of integrated computational materials engineering. In summary, experimental tests showed that fatigue cracks were mainly nucleated at high-angle grain boundaries around small grains or parallel to slip bands (pyramidal or basal) and to twin interfaces in large grains. This information was integrated within a physically-based crystal plasticity model and the fatigue life of Mg alloys was predicted using computational homogenization of a representative volume element of the microstructure by means of fatigue indicator parameters which were partially based on the newly observed fatigue crack nucleation mechanisms. In addition, a coupled crystal plasticity/phase field model was developed to include in the simulations the lattice rotation associated with twinning (twinning was only included as a pseudo-slip mechanism in the crystal plasticity framework), which will provide a more realistic simulation of nucleation of fatigue cracks near twin boundaries. Finally, molecular dynamics simulations were carried out to understand the effect of precipitates on dislocation glide and twin migration. The achievement of this project will allow to design novel Mg alloys with improved fatigue resistance.
Data: CORDIS, © European Union
Project objective
According to the Europe police (EV5V-CT94-0375) Magnesium alloys are potential metals to be progressively introduced in structural components in many areas, especially in transport to reduce weight and achieve required CO2 reductions. As the deformation and failure mechanisms of Mg alloys are very complicated owing to basal slip, prism slip, primed slip and twinning, there lack reliable continuum level constitutive models for engineering application. This project will solve one of the most challenging open questions of Mg alloys, i.e. the influence of twin formation and persistent slip bands on the fatigue crack nucleation and growth by using rigorously scale-bridged models and in-situ experiments. Molecular dynamics, dislocation dynamics, phase field, nonlocal crystal plasticity finite element as well as cohesive zone method will be used to study twin nucleation, twin growth, persistent slip band as well as fatigue crack, respectively. The outcome of this interdisciplinary research proposal will be published in high impact peer-reviewed journals and at international conferences. The approach and the code developed in this proposal will improve the predictive power of Integrated Computational Materials Engineering concerning Mg alloy industry. The applicant will transfer his expertise and his international connection in the field of multiscale modelling to the host institute. He will work with researchers of the host institution to prompt new areas of research that can attract new funding. At the same time, he will receive regular training on transferable skills. All these activities will enlarge the portfolio of skills of the applicant and will ensure further development of his career.
Original text from CORDIS.
Participants
- FUNDACION IMDEA MATERIALES · GetafeCoordinatorSpain
Links
- View on CORDIS
- DOI: 10.3030/795658
- https://materiales.imdea.org/proyectos/mafma-multiscale-analysis-of-fatigue-in-mg-alloys/
Data: CORDIS, © European Union