Microstructure regulation and mechanical properties of Ti-34 Nb-4 Zr-0.3 O alloys by aging
Metastable β type Ti-34Nb-4Zr-0.3O(mass fraction/%)alloy(TNZO)was prepared by vacuum arc melting,single-phase hot forging and cold rolling.The cold-rolled TNZO alloys were aged at low-temperature of 250℃and 300℃in order to reveal the effect of aging temperature and time on the precipitation behavior of ω phase and the mechanical properties of the alloys.The results show that ω phase precipitates in nanometer size as a result of low temperature aging which leads to the increase of strength and elastic modulus of the alloys.ω phase is easy to coarsen and agglomerate when the alloy is aged at 300℃,which results in the rapid drop of the elongation and embrittlement of the alloy.Short time aging at 250℃could make the ω phase precipitated dispersedly with small volume fraction,enabling the alloy to have excellent comprehensive properties of high strength,low modulus,ultra-high elasticity and good plasticity and show a broad application prospect in the field of aerospace elastic titanium alloys and medical implant titanium alloys.
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