CN-117626038-B - High-strength-plasticity matched heterostructure titanium-based composite material and preparation method thereof

Abstract

The invention discloses a preparation method of a heterostructure titanium-based composite material with high plasticity matching, which comprises the steps of firstly dispersing high-activity alumina nano particles after activity adjustment to obtain alumina nano particle suspension, secondly adding titanium alloy powder to obtain a mixed solution of titanium alloy powder and alumina, thirdly evaporating to dryness to obtain titanium alloy powder with a core-shell structure and pre-coated nano alumina, fourthly performing low-energy ball milling coating after vacuum treatment to obtain nano alumina-titanium core-shell structure powder, and fifthly sintering at low temperature for a short time to obtain the heterostructure titanium-based composite material. According to the invention, the high-activity gamma-structure alumina nano particles are coated to form the alumina-titanium core-shell structure powder after the activity is regulated, and then the powder is sintered at low temperature for a short time, so that the diffusion migration and interaction of the high-activity and high-defect gamma-structure alumina and titanium are greatly promoted, an ultrafine multistage gradient reinforcement phase is obtained, a heterostructure titanium-based composite material is formed, and the strong molding matching performance of the titanium-based composite material is remarkably improved.

Inventors

• SUN GUODONG
• ZHANG MEI
• DONG LONGLONG
• LI MINGYANG
• LI MINGJIA
• XU JUNJIE

Assignees

• 西安稀有金属材料研究院有限公司

Dates

Publication Date

20260505

Application Date

20231130

Claims (5)

1. 1. The preparation method of the heterostructure titanium-based composite material with high plasticity matching is characterized by comprising the following steps of: The method comprises the steps of firstly, adjusting the activity of high-activity alumina nano particles, and then dispersing the high-activity alumina nano particles in ethanol solution with the aid of a dispersing agent to obtain alumina nano particle suspension, wherein the high-activity alumina nano particles are alumina with a high-activity gamma structure, the high-activity alumina nano particles have a porous structure, the average particle size is smaller than 50nm, the specific surface area is larger than 50m 2 /g, and the activity adjusting method is ultrasonic or ball milling treatment; Step two, adding titanium alloy powder into the alumina nano particle suspension obtained in the step one while stirring at room temperature to obtain a mixed solution of the titanium alloy powder and alumina; step three, stirring and evaporating the mixed solution of the titanium alloy powder and the alumina obtained in the step two under the water bath condition to dryness to obtain titanium alloy powder with a core-shell structure and pre-coated nano alumina; Step four, carrying out vacuum treatment on the titanium alloy powder pre-coated with nano alumina obtained in the step three to remove a dispersing agent, and then carrying out low-energy ball milling coating to obtain nano alumina-titanium core-shell structure powder; And fifthly, carrying out low-temperature short-time sintering on the nano aluminum oxide-titanium core-shell structure powder obtained in the step four to obtain the heterostructure titanium-based composite material, wherein the low-temperature short-time sintering is high-current plasma activated vacuum hot-pressing sintering, the sintering temperature is 800-1100 ℃, the heat preservation time is less than 30min, the sintering pressure is greater than 10MPa, the tensile strength of the heterostructure titanium-based composite material is 540-1200 MPa, and the elongation is 7% -23%.
2. 2. The method for preparing the high-strength plastic-matched heterostructure titanium-based composite material according to claim 1, wherein in the first step, the dispersing agent is polyethylene glycol and PVP, and the mass of the dispersing agent is less than 0.3% of the mass of the ethanol solution.
3. 3. The method for preparing the high-strength and plasticity matched heterostructure titanium-based composite material according to claim 1, wherein the rotation speed adopted by the low-energy ball milling cladding in the fourth step is less than 350r/min.
4. 4. The method for preparing the heterostructure titanium-based composite material with high plasticity matching according to claim 1, wherein in the step five, the heterostructure in the heterostructure titanium-based composite material is a multi-stage precipitated phase gradient distribution structure that high-activity gamma alumina nano particles are dissolved and diffused into a titanium matrix in a shell, and titanium oxide-containing aluminum is precipitated on the shell to crystal grains and crystal boundaries and dislocation positions of the titanium matrix.
5. 5. A high-strength plasticity matched heterostructure titanium-based composite material, characterized in that the heterostructure titanium-based composite material is prepared by the method of any one of claims 1-4.

Description

High-strength-plasticity matched heterostructure titanium-based composite material and preparation method thereof Technical Field The invention belongs to the technical field of preparation of metal matrix composite materials, and particularly relates to a heterostructure titanium matrix composite material with high-strength plastic matching and a preparation method thereof. Background Titanium has become the "third metal" that has emerged since the middle lobe of the fifties of the last century after ferroalloys, i.e., steel and metallic aluminum. Compared with other metals and alloys, the metal titanium has the advantages of low density, better resistance at extremely high temperature or extremely low temperature, strong corrosion resistance, low heat conduction coefficient, almost no magnetic substance, high specific strength and the like. Through decades of development, the application field of the metal titanium is not only related to the military industry and the high-altitude and ultra-high-altitude flight field, but also the application frequency of the metal titanium to the industries of society is greatly increased in normal life. However, with the increasing demands for high-performance materials in the fields of aerospace and the like, such as the demands for light-weight and high-strength materials for hypersonic aircrafts and next-generation high-performance aeroengines, the design performance of titanium alloys is increasingly unable to meet the demands of various applications. Thus, the trend of transferring titanium alloys to titanium-based composite materials has emerged, which is gradually replacing titanium alloys in some fields, but also applied to aviation products having high requirements as described above. However, in the previous researches, researchers mostly select carbon sources (such as graphene, diamond, carbon nano tubes and the like) and boron sources (such as boron powder, titanium diboride, boron carbide and the like) as reinforcing phases of the titanium-based composite material, however, the enrichment of the reinforcing phases at the shell is often caused by the introduction of the traditional carbon sources and the boron sources, so that the strong plastic matching of the titanium alloy material is unbalanced. Therefore, a reinforcing phase which enables the titanium-based composite material to be better matched with the strong plasticity is selected as a great difficulty of whether the titanium-based composite material can meet the requirement. Disclosure of Invention The technical problem to be solved by the invention is to provide a preparation method of a heterostructure titanium-based composite material with high-strength plastic matching aiming at the defects of the prior art. According to the method, after the activity of the high-activity gamma-structure alumina nano particles is regulated, the high-activity gamma-structure alumina nano particles and titanium alloy powder are sequentially subjected to liquid-phase pre-coating and low-energy ball milling coating to form alumina-titanium core-shell structure powder, and then low-temperature short-time sintering is carried out, so that the diffusion migration and interaction of the high-activity and high-defect gamma-structure alumina and titanium are greatly promoted, an ultrafine multistage gradient reinforced phase is obtained, a heterostructure titanium-based composite material is formed, and the strong molding matching performance of the titanium-based composite material is remarkably improved. In order to solve the technical problems, the technical scheme adopted by the invention is that the preparation method of the heterostructure titanium-based composite material with high-strength plastic matching is characterized by comprising the following steps: Step one, regulating activity of high-activity alumina nano particles, and dispersing the high-activity alumina nano particles in an ethanol solution under the assistance of a dispersing agent to obtain an alumina nano particle suspension, wherein the high-activity alumina nano particles are alumina with a high-activity gamma structure; Step two, adding titanium alloy powder into the alumina nano particle suspension obtained in the step one while stirring at room temperature to obtain a mixed solution of the titanium alloy powder and alumina; step three, stirring and evaporating the mixed solution of the titanium alloy powder and the alumina obtained in the step two under the water bath condition to dryness to obtain titanium alloy powder with a core-shell structure and pre-coated nano alumina; Step four, carrying out vacuum treatment on the titanium alloy powder pre-coated with nano alumina obtained in the step three to remove a dispersing agent, and then carrying out low-energy ball milling coating to obtain nano alumina-titanium core-shell structure powder; And step five, carrying out low-temperature short-time sintering on the nano aluminum oxide-titanium