High-toughness wear-resistant corrosion-resistant Ti-Zr-Ta plate and preparation method thereof

Abstract

The application provides a high-toughness wear-resistant and corrosion-resistant Ti-Zr-Ta plate and a preparation method thereof, and belongs to the technical field of alloy materials. The Ti-Zr-Ta plate comprises 0.1-15 % of Ta, 80-98 % of Ti and Zr in total, and inevitable impurities in the rest, according to the mass percentage. Any one of Ti and Zr is the main base element of the alloy, and the weight ratio of Ti and Zr is 9:1-1:9, and Ti and Zr can be mutually substituted to form a continuous solid solution structure. The Ti-Zr-Ta plate is prepared through a melting, forging, hot rolling and heat treatment process, and the microstructure is composed of needle-like alpha phase, beta phase and Ta-rich precipitated phase. Through the synergistic regulation of the component design and the preparation process, the alloy has good corrosion resistance, wear resistance, high strength and high toughness in a strong corrosion medium environment, and is suitable for structural parts or wear-resistant parts under strong corrosion conditions.

Description

Technical Field

[0001] This invention belongs to the field of alloy materials technology, and particularly relates to a high-strength, tough, wear-resistant and corrosion-resistant Ti-Zr-Ta plate and its preparation method. Background Technology

[0002] Nuclear waste reprocessing employs this chemical method, which uses high-temperature concentrated nitric acid to dissolve nuclear waste pellets, remove fission products, and thus recover nuclear fuel. The chemical equipment used for nuclear waste reprocessing operates for extended periods in environments with highly concentrated boiling nitric acid and other strongly oxidizing and corrosive media, while also enduring the scouring effects of flowing media, mechanical friction, and external loads. This necessitates that the equipment materials possess high strength and fracture toughness, excellent resistance to nitric acid corrosion, and good wear resistance.

[0003] Ti alloys are widely used in nuclear waste reprocessing equipment due to their excellent corrosion resistance and good mechanical properties. Since Ta dissolved in Ti further improves corrosion resistance, Ti-Ta alloys are currently the most widely used material. However, the tensile strength of Ti-Ta alloys is only 300-400 MPa, and their wear resistance is poor. Patents with publication numbers CN119843105 A and CN 111826550 A add alloying elements such as O, Nb, and Al to Ti-Ta alloys, which can increase the tensile strength to 450-750 MPa, but at the same time, the corrosion resistance decreases. Zr itself has even better corrosion resistance, but Zr alloys have a narrow hot working window, which is not conducive to plate preparation, and their tensile strength is relatively low. Patent CN 114150184A adds Hf and Ti to Zr alloys, regulating the microstructure to a single α phase, but the final tensile strength only reaches 450 MPa.

[0004] In summary, the existing technology has not yet provided a method for preparing a plate material with excellent comprehensive properties of corrosion resistance, wear resistance and high strength and toughness that can be achieved simultaneously through composition design and deformation heat treatment process in a Ti or Zr-based system. Summary of the Invention

[0005] To address the aforementioned technical problems, this invention proposes a high-strength, tough, wear-resistant, and corrosion-resistant Ti-Zr-Ta plate and its preparation method. This invention significantly improves strength, toughness, and wear resistance while maintaining excellent corrosion resistance through synergistic control of component design and preparation process.

[0006] To achieve the above objectives, the present invention provides the following technical solution: This invention provides a high-strength, tough, wear-resistant, and corrosion-resistant Ti-Zr-Ta plate. By mass percentage, the chemical composition of the plate includes 0.1-15% Ta, a total content of 80-98% Ti and Zr, and the balance being unavoidable impurities; wherein the weight ratio of Ti to Zr is 9:1 to 1:9.

[0007] Furthermore, by mass percentage, the chemical composition of the plate includes 4-6% Ta, a total content of 94-96% Ti and Zr, and the balance being unavoidable impurities.

[0008] The high-strength, high-toughness, wear-resistant, and corrosion-resistant Ti-Zr-Ta plate of this invention uses either Ti or Zr as the main matrix element of the alloy. These two elements can substitute for each other to form a continuous solid solution structure. The high-strength, high-toughness, wear-resistant, and corrosion-resistant Ti-Zr-Ta plate consists of a needle-like α phase + β phase + Ta-rich precipitates, forming a multi-scale heterogeneous structure. The main functions of each component are as follows: Ti and Zr are the main matrix elements; Ta improves corrosion resistance; Zr strengthens the stabilizing effect of Ta on the β phase and can regulate the Ta-rich precipitates. The synergistic effect of these elements further enhances the product performance without causing negative impacts.

[0009] This invention also provides a method for preparing the above-mentioned high-strength, tough, wear-resistant, and corrosion-resistant Ti-Zr-Ta plate, comprising the following steps: According to the chemical composition, the alloy ingot is prepared by vacuum melting after feeding the raw materials. After homogenization treatment, the alloy ingot is forged to obtain an intermediate billet. The intermediate billet is hot-rolled to obtain a hot-rolled plate; The hot-rolled plate is annealed and cooled to obtain the high-strength, tough, wear-resistant, and corrosion-resistant Ti-Zr-Ta plate.

[0010] Furthermore, the vacuum degree of the vacuum melting is 1×10⁻⁶. -3 ~8×10 -3 Pa, the number of melting cycles is 6 to 8, and the termination temperature of each melting cycle is independent, ranging from 2000 to 3000℃.

[0011] Furthermore, the homogenization treatment is carried out at a temperature of 1000–1200°C for 6–12 hours.

[0012] Furthermore, the forging temperature is 150–200°C above the phase transformation point.

[0013] Furthermore, the final rolling temperature of the hot rolling is 700-900℃, the hot rolling is performed 3-6 times, and the total deformation per hot rolling is 40-45% of the thickness before deformation.

[0014] Furthermore, the annealing process involves heating to the β phase region and holding for 10–30 minutes.

[0015] Furthermore, the cooling method is water cooling.

[0016] More preferably, the preparation method of the high-strength, tough, wear-resistant, and corrosion-resistant Ti-Zr-Ta plate specifically includes the following steps: (1) Vacuum arc melting is carried out in a vacuum arc furnace according to the above chemical composition requirements, with a vacuum degree of 1×10 -3 ~8×10 -3 Pa, the number of melting times is 6 to 8, and the termination temperature of each melting is independent at 2000 to 3000℃. After solidification, a high-strength, tough, wear-resistant and corrosion-resistant Ti-Zr-Ta alloy ingot is obtained. (2) The alloy ingot is homogenized at a temperature of 1000-1200℃ and a holding time of 6-12h. The forging temperature is 150-200℃ above the phase transformation point to obtain intermediate billet. (3) The intermediate billet is hot rolled. The final rolling temperature is 700-900℃, the hot rolling is 3-6 times, and the total deformation of a single hot rolling is 40-45% of the thickness before deformation, to obtain a hot rolled plate. (4) After heating the hot-rolled plate to the β phase region and holding it for 10 to 30 minutes, water cooling is performed to obtain a high-strength, tough, wear-resistant and corrosion-resistant Ti-Zr-Ta plate.

[0017] The high-strength, high-toughness, wear-resistant, and corrosion-resistant Ti-Zr-Ta plates prepared by the method of this invention have a yield strength ≥600MPa, tensile strength ≥900MPa, room temperature elongation ≥8%, and impact toughness ≥20J / m. 2 The Vickers hardness is ≥250 HV; and the self-corrosion potential in 8 mol / L nitric acid solution is ≥300 mV, and the corrosion current is ≤10 mV. -6 A / cm 2 The corrosion rate is ≤0.08mm / a.

[0018] This invention, through innovative compositional design, introduces Zr into the Ti-Ta alloy system, allowing both Ti and Zr to serve as the main matrix and substitute for each other, thus balancing processability and corrosion resistance. First, Zr enhances the stabilizing effect of Ta on the β phase, facilitating the expansion of the β phase region and broadening the hot working window. Furthermore, after deformation heat treatment combined with water cooling, it is easier to obtain a fine, needle-like α phase structure, improving strength, toughness, and wear resistance. Second, Zr can form a composite passivation film composed of TiO2, ZrO2, and Ta2O5 in a nitric acid environment, with ZrO2 providing higher chemical stability and self-healing ability of the passivation film, further improving corrosion resistance. Additionally, Zr can adjust the solid solubility of Ta in the Ti-Zr matrix, allowing for the formation of Ta-rich precipitates within the microstructure as needed, thus playing a precipitation strengthening role.

[0019] In this invention, due to the high melting point of Ta, in order to ensure the uniformity of the microstructure of the Ti-Zr-Ta alloy ingot, it is necessary to repeatedly melt 6 to 8 times, and control the termination temperature of each melting independently at 2000 to 3000°C; in order to ensure the good hot working ability of the Ti-Zr-Ta alloy, the forging opening temperature is controlled at 150 to 200°C above the phase transformation point, and the hot rolling temperature is controlled at 700 to 900°C; in order to ensure the acquisition of fine needle-like α phase, it is necessary to heat to the β single-phase region during annealing, and then perform water cooling treatment to suppress the excessive growth of α phase.

[0020] Compared with the prior art, the present invention has the following advantages and technical effects: (1) The high-strength, tough, wear-resistant and corrosion-resistant Ti-Zr-Ta plate of the present invention has a low corrosion rate in nitric acid environment, and the composite oxide film formed by Ti, Zr and Ta has good corrosion resistance and self-healing ability; (2) The present invention utilizes deformation heat treatment technology to regulate the α phase transformation behavior, so that it is distributed in the β phase in the form of fine needles, forming a dense heterogeneous structure, which improves the strength, toughness and wear resistance of Ti-Zr-Ta plate; (3) The present invention can adjust the Ta-rich precipitate phase by changing the Zr content, thereby further strengthening the Ti-Zr-Ta plate; (4) This invention achieves synergistic control of composition, process, structure and properties of high-strength, tough, wear-resistant and corrosion-resistant Ti-Zr-Ta plates. The processing and preparation difficulty and production cost are low, and industrial application can be realized. Attached Figure Description

[0021] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings: Figure 1 This is a scanning electron microscope (SEM) image of the high-strength, tough, wear-resistant, and corrosion-resistant Ti-Zr-Ta substrate of Embodiment 1 of the present invention. Figure 2 This is a tensile curve of the high-strength, tough, wear-resistant, and corrosion-resistant Ti-Zr-Ta plate of Embodiment 1 of the present invention; Figure 3 This is a Tafel polarization curve of the high-strength, tough, wear-resistant, and corrosion-resistant Ti-Zr-Ta plate of Embodiment 1 of the present invention; Figure 4 This is a scanning electron microscope (SEM) image of the high-strength, tough, wear-resistant, and corrosion-resistant Ti-Zr-Ta plate from Embodiment 2 of the present invention. Figure 5 This is a tensile curve of the high-strength, tough, wear-resistant, and corrosion-resistant Ti-Zr-Ta plate of Embodiment 2 of the present invention; Figure 6 This is a Tafel polarization curve of the high-strength, tough, wear-resistant, and corrosion-resistant Ti-Zr-Ta plate of Embodiment 2 of the present invention; Figure 7 This is a scanning electron microscope (SEM) image of the Ti-Ta substrate of Comparative Example 1 of this invention. Figure 8 This is a tensile curve of the Ti-Ta plate of Comparative Example 1 of the present invention; Figure 9 This is a scanning electron microscope (SEM) image of the Ti-Zr-Ta substrate of Comparative Example 3 of this invention. Detailed Implementation

[0022] Various exemplary embodiments of the present invention will now be described in detail. This detailed description should not be considered as a limitation of the present invention, but rather as a more detailed description of certain aspects, features, and embodiments of the present invention.

[0023] It should be understood that the terminology used in this invention is merely for describing particular embodiments and is not intended to limit the invention. Furthermore, with respect to numerical ranges in this invention, it should be understood that each intermediate value between the upper and lower limits of the range is also specifically disclosed. Every smaller range between any stated value or intermediate value within a stated range, and any other stated value or intermediate value within said range, is also included in this invention. The upper and lower limits of these smaller ranges may be independently included or excluded from the range.

[0024] Unless otherwise stated, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. While only preferred methods and materials have been described herein, any methods and materials similar or equivalent to those described herein may be used in the implementation or testing of this invention. All references to this specification are incorporated by way of citation to disclose and describe methods and / or materials associated with those references. In the event of any conflict with any incorporated reference, the content of this specification shall prevail.

[0025] Various modifications and variations can be made to the specific embodiments described in this specification without departing from the scope or spirit of the invention, as will be apparent to those skilled in the art. Other embodiments derived from this specification will also be apparent to those skilled in the art. This specification and embodiments are merely exemplary.

[0026] The terms “include,” “including,” “have,” “contain,” etc., used in this article are all open-ended terms, meaning that they include but are not limited to.

[0027] This invention provides a high-strength, tough, wear-resistant, and corrosion-resistant Ti-Zr-Ta plate. By mass percentage, the chemical composition of the plate includes 0.1-15% Ta, a total content of 80-98% Ti and Zr, and the balance being unavoidable impurities; wherein the weight ratio of Ti to Zr is 9:1 to 1:9.

[0028] In a preferred embodiment of the present invention, the chemical composition of the board material, by mass percentage, includes 4-6% Ta, 94-96% Ti and Zr, and the balance being unavoidable impurities.

[0029] This invention also provides a method for preparing the above-mentioned high-strength, tough, wear-resistant, and corrosion-resistant Ti-Zr-Ta plate, comprising the following steps: According to the chemical composition, the alloy ingot is prepared by vacuum melting after feeding the raw materials. After homogenization treatment, the alloy ingot is forged to obtain an intermediate billet. The intermediate billet is hot-rolled to obtain a hot-rolled plate; The hot-rolled plate is annealed and cooled to obtain a high-strength, tough, wear-resistant, and corrosion-resistant Ti-Zr-Ta plate.

[0030] This invention relates to a high-strength, tough, wear-resistant, and corrosion-resistant Ti-Zr-Ta plate, employing a process flow of melting, homogenization, forging, hot rolling, annealing, and cooling. The interconnectedness of each process allows for gradual control of the alloy's microstructure. Vacuum melting ensures the uniformity of the alloy ingot's composition, avoiding defects such as oxidation and inclusions during the melting process, thus laying a solid foundation for subsequent hot working. Homogenization eliminates component segregation and casting stress in the ingot. Forging transforms the as-cast microstructure into a deformable microstructure, breaking up coarse grains and improving the alloy's hot working properties. Thermoplastic deformation further refines the grains, controlling the alloy's phase transformation behavior and creating conditions for the formation of fine needle-like α-phase during subsequent annealing. Annealing achieves phase transformation control and stress release, while the cooling method determines the growth morphology of the α-phase, ultimately forming the target microstructure of needle-like α-phase + β-phase + Ta-rich precipitates, ensuring the alloy's high strength, toughness, wear resistance, and corrosion resistance.

[0031] In a preferred embodiment of the present invention, the vacuum degree of vacuum melting is 1×10⁻⁶. -3 ~8×10 -3 The melting process involves 6 to 8 melting cycles, with each melting cycle ending at an independent temperature of 2000 to 3000°C. Preferably, the vacuum degree for vacuum melting is 6 × 10⁻⁶. -3 ~7×10 -3 The melting process involves 6 or 7 melting cycles, with each melting cycle ending at an independent temperature of 2500–2600℃. The high-vacuum environment prevents oxidation and nitriding reactions between the alloy and air during melting, thus preventing the formation of oxide inclusions such as TiO2, ZrO2, and Ta2O5, ensuring ingot purity. Repeated melting effectively eliminates Ta segregation, ensuring a uniform distribution of Ti, Zr, and Ta in the ingot, preventing subsequent hot working cracking and performance inhomogeneity due to compositional segregation. The ending temperature of 2000–3000℃ is significantly higher than the melting point of the Ti-Zr-Ta alloy, ensuring complete melting into a liquid state and thorough mixing of elements, further enhancing the compositional uniformity of the ingot.

[0032] In a preferred embodiment of the present invention, the homogenization treatment temperature is 1000–1200℃, and the holding time is 6–12 hours. Preferably, the homogenization treatment temperature is 1150–1200℃, and the holding time is 8–12 hours. This temperature is within the high-temperature solid solution region of the Ti-Zr-Ta alloy, where atomic diffusion is strong, effectively eliminating dendritic segregation and intergranular segregation in the ingot, thus making the composition more uniform. If the temperature is too low, atomic diffusion is slow, resulting in poor homogenization; if the temperature is too high, it can easily lead to coarse grains in the ingot, increasing the difficulty of subsequent processing.

[0033] In a preferred embodiment of the present invention, the forging temperature is 150–200°C above the phase transformation point. Preferably, the forging temperature is 180–200°C above the phase transformation point. In the high-temperature region above the phase transformation point, the alloy microstructure is dominated by the β phase with good plasticity and low deformation resistance, which can achieve forging with large deformation and avoid cracking caused by low-temperature forging. At the same time, this temperature range avoids coarse grains caused by excessively high temperatures, and can break up the coarse grains in the cast state through forging deformation to form a fine β-deformed microstructure, laying the foundation for grain refinement and phase transformation control in subsequent hot rolling. The introduction of Zr into the Ti-Zr-Ta alloy broadens the β-phase region, and the forging temperature of 150–200°C above the phase transformation point further utilizes this characteristic, solving the problem of narrow hot working window of single Zr alloys.

[0034] In a preferred embodiment of the present invention, the final rolling temperature of hot rolling is 700–900°C, the number of hot rolling passes is 3–6, and the total deformation per pass is 40–45% of the thickness before deformation. Preferably, the final rolling temperature of hot rolling is 830–850°C, the number of hot rolling passes is 3–4, and the total deformation per pass is 40–45% of the thickness before deformation. This temperature is in the α+β dual-phase region of the Ti-Zr-Ta alloy, where β-phase deformation and α-phase dynamic precipitation can occur simultaneously during hot rolling, achieving dynamic grain refinement. If the final rolling temperature is too high, it can easily lead to grain growth; if it is too low, the deformation resistance is too high, which can easily lead to work hardening and plate cracking. Multiple hot rolling passes further break down the grains and refine the microstructure by accumulating deformation, while also allowing the alloy stress to be released evenly, avoiding plate warping and cracking caused by a single large deformation. If the number of hot rolling passes is too few, the deformation is insufficient, and the grain refinement effect is poor; if too many passes are too many, it increases production costs and can easily lead to oxidation of the plate surface.

[0035] In a preferred embodiment of the present invention, the annealing process involves heating to the β phase region and holding for 10–30 minutes. Preferably, the annealing process involves heating to the β phase region and holding for 15–20 minutes.

[0036] In a preferred embodiment of the present invention, the cooling method is water cooling. Water cooling causes the β phase to undergo a martensitic phase transformation at low temperature, forming fine needle-like α phases, rather than the coarse lath-like α phases formed by slow cooling. The needle-like α phases are uniformly distributed in the β phase, forming a dense heterogeneous structure, which greatly improves the strength, toughness, and wear resistance of the alloy. At the same time, it can also inhibit the diffusion of Ta elements, so that the Ta-rich precipitates are uniformly and finely distributed in the Ti-Zr matrix, giving full play to the precipitation strengthening effect. The fine-grained structure after water cooling provides good surface microstructure conditions for the alloy to form a dense and uniform TiO2-ZrO2-Ta2O5 composite passivation film in corrosive media, further improving corrosion resistance.

[0037] The test site for the samples in this invention is the longitudinal section of a high-strength, tough, wear-resistant, and corrosion-resistant Ti-Zr-Ta plate sample. The microstructure was examined using a HITACHI SU7000 SEM scanning electron microscope. The room temperature tensile test specimen dimensions and performance determination methods refer to GB / T 228-2002, and the equipment used is a ZWICK Z100HT tensile testing machine. The impact toughness test refers to GB / T229-2020, and the equipment used is a ZBC2302-D impact testing machine. The hardness was determined using a YZHV-1000P Vickers hardness tester. The electrochemical sample dimensions and Tafel polarization curve test methods refer to GB / T 17899-1999, and the equipment used is a Princeton Parstat 3000.

[0038] Unless otherwise specified, "room temperature" in this invention refers to 10-30°C.

[0039] All raw materials used in the following embodiments and comparative examples of the present invention are commercially available products.

[0040] The technical solution of the present invention will be further illustrated by the following embodiments.

[0041] Example 1 A high-strength, tough, wear-resistant, and corrosion-resistant Ti-Zr-Ta plate, the alloy composition by mass percentage includes: Ta 6%, Zr 30%, with the balance being Ti and unavoidable impurities; wherein, Ti is the main matrix element of the alloy, and the mass ratio of Ti to Zr is approximately 2:1; the specific preparation method is as follows: (1) Prepare the raw materials according to the above chemical composition requirements (Ti, Zr, and Ta are added in elemental form with a purity of 99.99%, the same below), and perform vacuum arc melting in a vacuum arc furnace with a vacuum degree of 6×10 -3 Pa, the melting process is carried out 7 times, and the termination temperature of each melting is 2600℃. After solidification, a high-strength, tough, wear-resistant and corrosion-resistant Ti-Zr-Ta alloy ingot with a thickness of 200mm is obtained. (2) The alloy ingot is homogenized at a temperature of 1200℃ and a holding time of 8h. The forging temperature is 930℃ (the phase transformation point temperature is 750℃) to obtain an intermediate billet with a thickness of 100mm. (3) The intermediate billet is hot rolled. The final rolling temperature is 850℃, the hot rolling is 4 times, and the total deformation of a single hot rolling is 40% of the thickness before deformation, so as to obtain a hot rolled plate with a thickness of 13mm. (4) The hot-rolled plate is heated to 750°C, kept in the β phase region for 20 minutes and then water-cooled to obtain a high-strength, tough, wear-resistant and corrosion-resistant Ti-Zr-Ta plate.

[0042] The microstructure of the high-strength, tough, wear-resistant, and corrosion-resistant Ti-Zr-Ta plate prepared in Example 1 is as follows: Figure 1 As shown, the high-strength, tough, wear-resistant and corrosion-resistant Ti-Zr-Ta plate of Example 1 is composed of needle-like α phase + β phase + Ta-rich precipitate phase, forming a multi-scale heterogeneous structure.

[0043] The tensile curve of the high-strength, tough, wear-resistant, and corrosion-resistant Ti-Zr-Ta plate in Example 1 is shown below. Figure 2 As shown, its yield strength is 620.3 MPa, tensile strength is 905.6 MPa, room temperature elongation is 15.9%, and impact toughness is 31.2 J / m. 2 Its Vickers hardness is 284.9 HV.

[0044] The Tafel polarization curve of the high-strength, tough, wear-resistant, and corrosion-resistant Ti-Zr-Ta plate in 8 mol / L nitric acid solution in Example 1 is shown below. Figure 3As shown, its self-corrosion potential is 344.1 mV, and its corrosion current is 6.31 × 10⁻⁶. -7 A / cm 2 The corrosion rate is 0.06 mm / a.

[0045] Example 2 A high-strength, tough, wear-resistant, and corrosion-resistant Ti-Zr-Ta plate, the alloy composition by mass percentage includes: Ta 4%, Ti 30%, with the balance being Zr and unavoidable impurities; wherein Zr is the main matrix element of the alloy, and the weight ratio of Ti to Zr is approximately 1:2; the specific preparation method is as follows: (1) Vacuum arc melting is carried out in a vacuum arc furnace according to the above chemical composition requirements, with a vacuum degree of 7×10. -3 Pa, the melting process is carried out 6 times, and the termination temperature of each melting is 2500℃. After solidification, a high-strength, tough, wear-resistant and corrosion-resistant Ti-Zr-Ta alloy ingot with a thickness of 180mm is obtained. (2) The alloy ingot is homogenized at a temperature of 1150℃ and a holding time of 12h. The forging temperature is 800℃ (the phase transformation temperature is 600℃) to obtain an intermediate billet with a thickness of 90mm. (3) The intermediate billet is hot rolled at a final rolling temperature of 830°C. The hot rolling process is repeated 3 times, and the total deformation of a single hot rolling process is 45% of the thickness before deformation, to obtain a hot-rolled plate with a thickness of 15.0 mm. (4) The hot-rolled plate is heated to 650°C, kept in the β phase region for 15 minutes and then water-cooled to obtain a high-strength, tough, wear-resistant and corrosion-resistant Ti-Zr-Ta plate.

[0046] The microstructure of the high-strength, tough, wear-resistant, and corrosion-resistant Ti-Zr-Ta plate prepared in Example 2 is as follows: Figure 4 As shown, the high-strength, tough, wear-resistant and corrosion-resistant Ti-Zr-Ta plate of Example 2 is composed of needle-like α phase + β phase + Ta-rich precipitate phase, forming a multi-scale heterogeneous structure.

[0047] The tensile curve of the high-strength, toughness, wear-resistant, and corrosion-resistant Ti-Zr-Ta plate in Example 2 is shown below. Figure 5 As shown, its yield strength is 689.5 MPa, tensile strength is 916.8 MPa, room temperature elongation is 14.2%, and impact toughness is 28.9 J / m. 2 Its Vickers hardness is 290.2 HV.

[0048] The Tafel polarization curve of the high-strength, tough, wear-resistant, and corrosion-resistant Ti-Zr-Ta plate in 8 mol / L nitric acid solution in Example 2 is shown below. Figure 6 As shown, its self-corrosion potential is 785.6 mV, and its corrosion current is 4.38 × 10⁻⁶ mV. -7 A / cm2 The corrosion rate is 0.06 mm / a.

[0049] Comparative Example 1 Same as Example 1, except that the addition of Zr element is omitted, that is, the alloy composition by mass percentage includes: Ta 6%, with the balance being Ti and unavoidable impurities. The preparation method is the same as in Example 1, and Ti-Ta alloy plate is obtained.

[0050] The microstructure of the Ti-Ta alloy plate obtained in Comparative Example 1 is as follows: Figure 7 As shown, the Ti-Ta alloy plate consists of a strip-shaped α phase and a β phase, without the formation of a Ta-rich precipitate.

[0051] The tensile curve of the Ti-Ta alloy sheet obtained in Comparative Example 1 is as follows: Figure 8 As shown, its yield strength is 465.1 MPa, tensile strength is 549.2 MPa, room temperature elongation is 33.8%, and impact toughness is 48.2 J / m. 2 Its Vickers hardness is 163.2 HV. In 8 mol / L nitric acid solution, its self-corrosion potential is 166.1 mV, and its corrosion current is 4.5 × 10⁻⁶ mV. -6 A / cm 2 The corrosion rate is 0.15 mm / a.

[0052] In Comparative Example 1, no Zr was added, resulting in insufficient corrosion resistance and inadequate stabilization of the β phase. After water cooling, a lath-like α phase formed, and the Ta solid solubility could not be effectively controlled, leading to the absence of Ta precipitates. Therefore, the strength, corrosion resistance, and wear resistance of the plate were significantly lower than in Example 1.

[0053] Comparative Example 2 Same as Example 1, except that the addition of Ti element is omitted, that is, the alloy composition by mass percentage includes: Ta 8%, with the balance being Zr and unavoidable impurities, and the preparation method is the same as Example 1.

[0054] The alloy ingot of Comparative Example 2 suffered severe edge and transverse cracks during forging and hot rolling, making it difficult to produce finished sheet metal. This is because Comparative Example 2 did not contain Ti, resulting in poor machinability and a narrow processing window, making it impossible to produce finished sheet metal.

[0055] Comparative Example 3 Same as Example 1, except that the Ti-Zr-Ta hot-rolled plate was air-cooled after being heat-preserved in the β phase region, instead of being water-cooled.

[0056] The microstructure of the Ti-Zr-Ta plate in Comparative Example 3 is as follows: Figure 9 As shown, the Ti-Zr-Ta plate is composed of lath-shaped α phase + β phase.

[0057] The Ti-Zr-Ta sheet of Comparative Example 3 has a yield strength of 566.6 MPa, a tensile strength of 676.6 MPa, a room temperature elongation of 26.5%, and an impact toughness of 37.3 J / m. 2 The Vickers hardness is 198.2 HV. In 8 mol / L nitric acid solution, the self-corrosion potential is 311.2 mV, and the corrosion current is 6 × 10⁻⁶. -7 A / cm 2 The corrosion rate is 0.05 mm / a.

[0058] This is because, in Comparative Example 3, air cooling was used, which resulted in a slow cooling rate. This caused the α phase to grow excessively into laths, leading to a significant decrease in the strength of the plate.

[0059] The above are merely preferred embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A high-strength, tough, wear-resistant, and corrosion-resistant Ti-Zr-Ta plate, characterized in that, The chemical composition of the plate, by mass percentage, includes 0.1-15% Ta, 80-98% Ti and Zr in total, and the balance being unavoidable impurities; wherein the weight ratio of Ti to Zr is 9:1 to 1:

9.

2. The high-strength, tough, wear-resistant, and corrosion-resistant Ti-Zr-Ta plate according to claim 1, characterized in that, The chemical composition of the plate, by mass percentage, includes 4-6% Ta, a total content of 94-96% Ti and Zr, and the balance being unavoidable impurities.

3. A method for preparing a high-strength, tough, wear-resistant, and corrosion-resistant Ti-Zr-Ta plate according to any one of claims 1 to 2, characterized in that, Includes the following steps: According to the chemical composition, the alloy ingot is prepared by vacuum melting after feeding the raw materials. After homogenization treatment, the alloy ingot is forged to obtain an intermediate billet. The intermediate billet is hot-rolled to obtain a hot-rolled plate; The hot-rolled plate is annealed and cooled to obtain the high-strength, tough, wear-resistant, and corrosion-resistant Ti-Zr-Ta plate.

4. The method for preparing the high-strength, tough, wear-resistant, and corrosion-resistant Ti-Zr-Ta plate according to claim 3, characterized in that, The vacuum degree of the vacuum melting is 1×10⁻⁶. -3 ~8×10 -3 Pa, the number of melting cycles is 6 to 8, and the termination temperature of each melting cycle is independent, ranging from 2000 to 3000℃.

5. The method for preparing the high-strength, tough, wear-resistant, and corrosion-resistant Ti-Zr-Ta plate according to claim 3, characterized in that, The homogenization treatment is carried out at a temperature of 1000–1200℃ for 6–12 hours.

6. The method for preparing the high-strength, tough, wear-resistant, and corrosion-resistant Ti-Zr-Ta plate according to claim 3, characterized in that, The forging temperature is 150–200°C above the phase transformation point.

7. The method for preparing the high-strength, tough, wear-resistant, and corrosion-resistant Ti-Zr-Ta plate according to claim 3, characterized in that, The final rolling temperature of the hot rolling is 700-900℃, and the hot rolling process is 3-6 times.

8. The method for preparing the high-strength, tough, wear-resistant, and corrosion-resistant Ti-Zr-Ta plate according to claim 7, characterized in that, The total deformation in a single hot rolling process is 40-45% of the thickness before deformation.

9. The method for preparing the high-strength, tough, wear-resistant, and corrosion-resistant Ti-Zr-Ta plate according to claim 3, characterized in that, The annealing process involves heating to the β phase region and holding for 10–30 minutes.

10. The method for preparing the high-strength, tough, wear-resistant, and corrosion-resistant Ti-Zr-Ta plate according to claim 3, characterized in that, The cooling method is water cooling.

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