High-strength high-elasticity titanium alloy and preparation method thereof

Abstract

The invention relates to a high-strength high-elasticity titanium alloy and a preparation method thereof. The alloy comprises the following components of, in percentage by weight, 30%-32% of Nb, 4%-6%of Zr, 2%-3% of Mo, 0.038%-0.088% of Fe; 0.016%-0.037% of Cr, 0.005%-0.011% of Ni and the balance titanium; the preparation method of the alloy comprises the following specific steps of carrying outmechanical ball milling on titanium powder and absolute ethyl alcohol in a ball milling tank and a ball milling system composed of 0Cr18Ni9, and then performing SPS sintering on the titanium powder toobtain titanium sintering block containing trace Fe, Cr and Ni oxides; smelting flaky sintered titanium, titanium sponge, Nb, Zr and Mo raw materials in an electric arc furnace to obtain an alloy ingot; carrying out hot forging on the cast ingot into a bar material and carrying out solid solution treatment, and then carrying out cold rolling deformation processing; and finally, carrying out agingheat treatment, so that the alpha phase with the extremely fine nanometer size is separated out from a beta-precipitation matrix body. The obtained titanium alloy has high strength and high elastic performance, is low in elasticity modulus and high in elongation rate, is very suitable for manufacturing high-elasticity parts in the fields of aerospace, machinery and the like, and can also be applied to the preparation of biomedical implants.

Description

technical field [0001] The invention relates to a high-strength and high-elasticity titanium alloy and a preparation method thereof, and belongs to the technical field of design and preparation of titanium alloy materials. Background technique [0002] The main characteristic parameters of elastic metal materials are the tensile strength σ b , Yield strength σ 0.2 , elastic modulus E and elastic strain limit, where the elastic strain limit can be approximated by σ 0.2 Ratio to E (σ 0.2 / E) to represent. σ b Larger means that it can work under higher stress; σ 0.2 The larger the / E, the stronger the elastic deformation ability, that is, the elastic parts can be made smaller and lighter under the same stress level. Due to the high strength of titanium alloy, the elastic modulus and density are only 50% and 60% of steel, respectively, and the elastic deformation capacity is about twice that of steel, so it is very suitable for use as a lightweight high-performance elastic...

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Problems solved by technology

[0004] This kind of medical titanium alloy also has the potential to be used as a high-performance elastic material after strengthening treatment, but there are still some problems: ① The elastic modulus of the alloy in the solid solution state (composed of β phase) can be reduced to 55-65GPa, but Its yield strength also decreases synchronously (σ 0.2 Generally less than 700MPa), can not meet the requirements of high strength

However, since oxygen is an interstitial strengthening element, adding a high content of oxygen (0.30-0.55wt%) makes the elongation of the alloy low (8.0-10.7%), which affects the processability and fatigue performance of the alloy

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