New approach to achieve high strength powder metallurgy Ti-6Al-4V alloy through accelerated sintering at β-transus temperature and hydrogenation-dehydrogenation treatment

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Abstract

It is demonstrated that high density powder metallurgy (PM) Ti-6Al-4V alloy, with a finer prior-β grain size, can be achieved by vacuum sintering of TiH2 compacts at the β-transus (1010 °C) temperature, taking advantage of the accelerated self-diffusion. The subsequent refinement of the coarse lamellar microstructure by hydrogenation-dehydrogenation treatment produces a high tensile strength (~ 1130 MPa) and ductile (~ 10%) alloy. The superior tensile strength and ductility result from the nanoscale Widmanstatten structure and the finer prior-β grain size, respectively, created by the two treatments. The results show a promising pathway to make high strength and ductile PM titanium alloys.

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Cao, F., Chandran, K. S. R., & Kumar, P. (2017). New approach to achieve high strength powder metallurgy Ti-6Al-4V alloy through accelerated sintering at β-transus temperature and hydrogenation-dehydrogenation treatment. Scripta Materialia, 130, 22–26. https://doi.org/10.1016/j.scriptamat.2016.11.005

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