CN-117431483-B - High-temperature annealing reinforced pure tantalum and preparation method and application thereof

Abstract

The invention relates to high-temperature annealing strengthening pure tantalum and a preparation method and application thereof, wherein the preparation method of the high-temperature annealing strengthening pure tantalum comprises the steps of firstly carrying out cold plastic deformation processing on the pure tantalum for not less than 1 time at the temperature of not more than 30 ℃, and (3) obtaining fine-grain or superfine-grain pure tantalum, and then annealing the fine-grain or superfine-grain pure tantalum in vacuum at 300-600 ℃ to obtain the high-temperature annealed reinforced pure tantalum. The pure tantalum prepared by the preparation method has an annealing strengthening effect at a high temperature of 500 ℃, so that the high-temperature strength of the pure tantalum is improved, and a theoretical basis is laid for expanding the application field of the pure tantalum and improving the application capacity of the pure tantalum.

Inventors

• WANG XIANPING
• ZHANG GUANGJIE
• XIE ZHUOMING
• YANG JUNFENG
• ZHANG LINCHAO
• WU XUEBANG

Assignees

• 中国科学院合肥物质科学研究院

Dates

Publication Date

20260508

Application Date

20231027

Claims (4)

1. 1. A preparation method of high-temperature annealing strengthening pure tantalum is characterized in that cold plastic deformation processing is firstly carried out on the pure tantalum to obtain fine-grain or ultra-fine-grain pure tantalum with a large number of prefabricated dislocation, the specific steps of the cold plastic deformation processing comprise, (1) Firstly, carrying out equal channel angular extrusion on pure tantalum at 20 ℃ with 1-pass strain quantity of 1.03; (2) Then placing the extruded pure tantalum in liquid nitrogen, cooling for 20 minutes, taking out, when the surface temperature of a sample piece is measured to be minus 10 ℃ by an infrared temperature measuring instrument, starting to forge the pure tantalum, stopping forging when the surface temperature of the pure tantalum exceeds 0 ℃, continuously placing the pure tantalum in the liquid nitrogen, and starting to forge the next time when the surface temperature of the pure tantalum reaches minus 10 ℃, so that the total deformation of forging is 73% finally through the cycle; and then annealing the fine-grain or ultra-fine-grain pure tantalum in a heating furnace with the vacuum of 10 < -2 > Pa at 500 ℃ for 2 hours, so that a large number of prefabricated dislocation is evolved into a dislocation cell structure or substructure such as sub-crystal and the like, and the high-temperature annealed and reinforced pure tantalum can be obtained, wherein the high-temperature annealed and reinforced pure tantalum has the reinforcing effect at the high temperature of 500 ℃.
2. 2. A high temperature annealed enhanced pure tantalum prepared according to the method of claim 1.
3. 3. The high-temperature annealed and reinforced pure tantalum according to claim 2, wherein said high-temperature annealed and reinforced pure tantalum has a tensile strength of 525-561MPa at 500 ℃ and a total elongation of 13-16%.
4. 4. Use of the high temperature annealed and strengthened pure tantalum according to claim 3 for the preparation of high temperature resistant and high strength mechanical parts, comprising engine blades or vanes for aerospace applications.

Description

High-temperature annealing reinforced pure tantalum and preparation method and application thereof Technical Field The invention belongs to the technical field of metal materials, and particularly relates to high-temperature annealing reinforced pure tantalum, and a preparation method and application thereof. Background Tantalum is a body-centered cubic refractory metal, has the characteristics of high density and melting point, good ductility and corrosion resistance and the like, and is widely applied to the fields of electronic industry, metallurgical industry, advanced steel, automobile industry and the like, and in addition, the high-temperature strength of tantalum is outstanding, so that the tantalum is also commonly used for manufacturing engine blades and vanes in the aerospace field. The high-temperature mechanical property of the pure tantalum determines the application capacity of the pure tantalum, so that the high-temperature strength of the pure tantalum is further improved, and the high-temperature mechanical property of the pure tantalum has important research significance for expanding the application field of the pure tantalum and improving the application capacity of the pure tantalum; In the prior art, aiming at the annealing strengthening phenomenon of metal materials, the invention discloses an annealing strengthening process method for rolling pure tantalum foil under the room temperature environment, such as the patent number of CN111440938A, and the pure tantalum foil prepared by the process has room temperature annealing strengthening effect, so that the tensile strength and plastic deformation of the rolled tantalum foil are obviously improved, the room temperature mechanical property is improved, but no high temperature annealing effect exists, and the invention provides the high temperature annealing strengthening pure tantalum, and the preparation method and the application thereof. Disclosure of Invention The invention aims to solve the problems and provide high-temperature annealing strengthening pure tantalum as well as a preparation method and application thereof. The invention realizes the above purpose through the following technical scheme: As a first aspect of the present invention, there is provided a method for preparing high-temperature annealed enhanced pure tantalum, wherein pure tantalum is subjected to cold plastic deformation processing at a temperature of not higher than 30 ℃ for not less than 1 time to obtain fine-grain or ultra-fine-grain pure tantalum, and then the fine-grain or ultra-fine-grain pure tantalum is subjected to annealing treatment in vacuum at 300-600 ℃ to obtain high-temperature annealed enhanced pure tantalum. As a further optimization scheme of the invention, the cold plastic deformation processing is one or more of rotary forging, rolling, forging or extrusion, and the total strain amount of the cold plastic deformation processing is not less than 1. As a further preferable embodiment of the present invention, the specific steps of the cold plastic deformation process include, (1) Firstly, carrying out equal channel angular extrusion on pure tantalum at 20 ℃ with 1-pass strain quantity of 1.03; (2) And then placing the extruded pure tantalum in liquid nitrogen, cooling for 20 minutes, taking out, when the surface temperature of a sample piece is measured to be minus 10 ℃ by an infrared temperature measuring instrument, starting to forge the pure tantalum, stopping forging when the surface temperature of the pure tantalum exceeds 0 ℃, continuously placing the pure tantalum in the liquid nitrogen, starting to forge the pure tantalum for the next time when the surface temperature of the pure tantalum reaches minus 10 ℃, and finally realizing the total deformation of forging to be 73% by the cycle, thus completing the cold plastic deformation processing of the pure tantalum. As a further optimization scheme of the invention, the vacuum degree of the annealing treatment is not lower than 10 -1 Pa, and the annealing time is 0.5-5 hours. As a second aspect of the present invention, the present invention provides a high temperature anneal-enhanced pure tantalum according to any of the above. As a further optimization scheme of the invention, the tensile strength of the high-temperature annealed and reinforced pure tantalum at the high temperature of 500 ℃ is 525-561MPa, and the total elongation is 13-16%. As a third aspect of the present invention, the present invention also provides an application of the high temperature annealing strengthening pure tantalum in preparing high temperature resistant and high strength mechanical parts, including engine blades or vanes applied in the aerospace field. The invention has the beneficial effects that: The invention firstly carries out cold plastic deformation processing on commercial pure tantalum at low temperature to obtain fine-grain or ultra-fine-grain pure tantalum with a large number of prefabricate