| Abstract Scope |
This presentation will focus on the microstructure and multiscale mechanical behaviours of a laser directed energy deposition (LDED) produced Ti-6Al-2Zr-Mo-V alloy, using high-throughput nanoindentation mapping, in situ microscale tension, and macroscale fatigue tests. Firstly, the hardness (H) and modulus (E) of the α and β phases in both as-deposited and heat-treated titanium samples are measured, and the strong dependences of the chemical composition, crystal orientation, and nanoindentation depth on the measured H and E values are discussed. Secondly, the tensile deformation behaviours of the samples are characterized, and two types of deformation behaviours, slip banding and microscale shear banding, are observed in soft and hard α grains, respectively. Microscale shear banding is, for the first time, observed and being demonstrated as a beneficial behaviour to enhance the tensile ductility of the LDED-produced titanium alloys. Lastly, the fatigue crack growth behaviours of the as-deposited and heat-treated samples are studied. |