Influence of substitutional alloying elements on deformation mechanisms in beta Ti and Zr alloys – ISANAMI

This project consists of a multi-scale experimental investigation of the deformation mechanisms of bcc beta titanium and zirconium alloys covering various applications such as aeronautics or biomedical devices. Three mechanisms operate in these alloys: dislocation slip, twinning and stress-induced martensitic transformation, but many of their features are still not elucidated. Macroscopic mechanical properties will be characterized from tensile tests at temperatures from -150 °C to 800 °C for different binary model alloys, and at different strain rates. Mechanisms of deformation will then be analysed by SEM-EBSD and TEM. Additionally, in situ tensile tests will also be performed at the mesoscopic scale in SEM and at the microscopic scale in TEM at the same temperature range than macroscopic tensile tests.
This multi-scale experimental investigation aims for the first time to correlate the macroscopic mechanical properties to the elementary deformation mechanisms and determine the influence of alloying element content, temperature and strain rate in bcc Ti and Zr alloys.