THERMOPHYSICAL PROPERTIES OF ADDITIVE MANUFACTURED (AM) Ti6Al4V

Einat Strumza 1 Eitan Tiferet 2 Mahdi Halabi 1 Ori Yeheskel 2 Shmuel Hayun 1
1Materials Engineering, Ben-Gurion University of the Negev, Beer-Sheva, Israel
2Materials, Nuclear Research Center Negev, Beer-Sheva, Israel

Ti alloys are known for their high strength and good stability at high ranges of temperature and pressure. In the past few years, Additive Manufacturing (AM) technology becomes more developed and matured for metal fabrication. The great advantage of AM is the ability of fabrication near-net shape samples without the limitations of geometry. With the progress in this technology, there is a call for reliable thermal properties-processing-microstructure relationships of AM alloys.

In the present talk, the thermophysical properties (thermal expansion, heat capacity, and thermal conductivity) of Ti6Al4V fabricated by both Selective Laser Melting (SLM) and Electron Beam Melting (EBM) will be presented.

The thermal expansion and conductivity of AM parts showed strong deviation from the expected values compare to a conventionally processed Ti6Al4V alloy. Moreover, after heat treatment, a new phase was identified by both X-ray diffraction and Transmission Electron Microscopy (TEM), as Al3V0.333Ti0.666 with tetragonal structure. The effect of processing conditions and sample microstructure on the thermophysical properties will be discussed.









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