Abstract:
This work presents the microstructural investigation of an in situ synthesized TiB/Ti6Al4V-ELI composite that was manufactured
with additive manufacturing (AM) technique known as laser metal deposition (LMD). A single-track sample was
manufactured by adding TiB2
to Ti6Al4V-ELI at mass deposition volume of 5% and characterized for microstructure and
hardness. It was found that in situ reaction promoted the formation of quasi-continuous network microstructure of TiB whiskers
with a needle-like morphology, in a martensitic α′ matrix. Furthermore, the manufactured TiB/Ti6Al4V-ELI presented
two different grain growth morphologies, with smaller and large TiB network grains observed at the top and bottom of the
sample, respectively, due to heat travelling direction. A high hardness of 513 HV was observed at the top of the sample,
which was reduced to 483 HV at the bottom, promoted by grain growth.
