Summary of the project
The LoCoMecha project is set within the context of the increasing use of multiphase alloys such as Ti6Al4V, particularly in implants, where durability in physiological environments is critical. Although these materials are protected by a passive layer, they can still degrade under the influence of oxidizing species such as H₂O₂, generated during inflammatory reactions.
The main objective is to understand the coupled mechanisms of localized corrosion and mechanical degradation, in particular corrosion fatigue and associated cracking. The project also aims to link these mechanisms to the alloy microstructure, especially for materials produced by additive manufacturing.
The experimental approaches combine global and local electrochemical techniques, microstructural observations, and mechanical testing under controlled environments. This work is complemented by multiphysics models that describe corrosion–mechanical interactions.
The results show selective phase degradation, with oxide growth in certain areas and dissolution in others, leading to crack formation. They highlight the key role of microstructure in resistance to corrosion and crack propagation.
In conclusion, LoCoMecha provides a basis for better predicting the lifetime of multiphase alloys and for guiding their design for severe environments, particularly in biomedical applications.