Influence of Cu addition on the structures and properties of Ti15SnxCu alloys

ABSTRACT

In this study, Ti15SnxCu alloys were synthesised using an argon-arc melting and casting method. The as-cast alloy ingot was heat-treated for 2 h at 1000°C and then quenched in water to investigate the effects of heat treatment on the microstructure and corrosion behaviour of the Ti15SnxCu alloys. In comparison to the heat-treated Ti15Sn alloy, the average size of cellular grains (d_G), the lamellar length (λ_L), and the lamellar thickness (λ_T) in heat-treated Ti15Sn2Cu alloy were refined by approximately 36, 30, and 36%, respectively. The corrosion behaviour of heat-treated Ti15SnxCu alloys was made nobler by adding 2 wt-% Cu content. The precipitation of large amounts of nobler (Ti, Sn)₂Cu nanoparticles hindered grain growth, improved the UTS, 0.2YS, microhardness and good corrosion resistance.

KEYWORDS:

• Ti15SnxCu alloy
• heat-treat
• corrosion behaviour

Acknowledgements

Thank R. W. Wu for useful discussion and sample preparation. SEM was performed by the Precision Instrument Center of National Pingtung University of Science and Technology, Taiwan.

Disclosure statement

No potential conflict of interest was reported by the authors.

Additional information

Funding

The authors acknowledge the financial support of this work from the Ministry of Science and Technology, Taiwan, under Project No. MOST 105-ET-E-020-002-ET, 105-2622-E-020-003-CC3.