The Effect of Oxygen on the Phase Composition and Heat Treatment Behavior of Ti-V Alloys

Abstract:

Titanium and its alloys possess high specific strength, excellent corrosion resistance and good biocompatibility [1] [2]. Since oxygen is an unavoidable impurity in such materials, it has been adopted as an alloying element in the development of low-cost titanium alloys. Therefore, it is important to investigate the role of oxygen in these alloys, especially in β-type alloys. In the present study, the effects of oxygen on the electrical resistivity, Vickers hardness and heat treatment behavior of a Ti-20mass%V alloy which is the lowest concentration for which the fully retained β phase is obtained were assessed. The electrical resistivity and Vickers hardness of solution-treated and quenched specimens increased with increasing oxygen content, due to the dissolution of oxygen into the β phase and solid solution hardening, respectively. Upon isothermal aging at 673 K, the addition of O accelerated a-phase precipitation. The addition of O was found to suppress the appearance of the athermal ω phase in the solution-treated and quenched state.

• Periodical: Materials Science Forum (Volume 941)
• Pages: 1565-1569
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.941.1565
• Online since: December 2018
• Authors: Hitomi Nagasawa*, Masahiko Ikeda, Masato Ueda
• Keywords: Electrical Resistivity, Oxygen, Titanium Vanadium Alloy, Vickers Hardness

References

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