CN-117626040-B - Ultra-high-strength plastic three-dimensional multistage mixed heterogeneous titanium-based composite material and preparation method thereof

CN117626040BCN 117626040 BCN117626040 BCN 117626040BCN-117626040-B

Abstract

The invention discloses an ultra-high-strength plastic three-dimensional multi-stage mixed heterogeneous titanium-based composite material and a preparation method thereof, wherein the method comprises the steps of firstly, carrying out flow friction coating treatment on titanium alloy powder and high-active-site amorphous cracking carbon obtained by modification treatment; the second step of carrying out flowing friction cladding treatment with the high-activity high-dispersion boron source obtained by modification treatment, the third step of carrying out low-temperature short-time large pulse current auxiliary vacuum hot-pressing sintering, and the fourth step of carrying out non-constant rate thermal deformation treatment for multiple times. According to the invention, the high-activity site amorphous cracking carbon obtained through modification treatment and the high-activity high-dispersion boron source obtained through modification treatment are taken as reinforcing phase precursors to be sequentially coated on a titanium alloy powder substrate, and a multi-stage multi-scale multi-heterogeneous phase structure is constructed in four dimensions by combining sintering and thermal deformation treatment, so that the three-dimensional multi-stage mixed heterogeneous titanium-based composite material has ultrahigh strength and plasticity, the tensile strength reaches 1430 MPa-1605 MPa, and the elongation reaches 7.5% -9%.

Inventors

SUN GUODONG
LI MINGYANG
Su Xuwen
DONG LONGLONG
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 (3)

1. The preparation method of the ultra-high-strength plastic three-dimensional multi-stage mixed heterogeneous titanium-based composite material is characterized by comprising the following steps of: The method comprises the steps of firstly, carrying out flow friction cladding treatment on titanium alloy powder and high-activity site amorphous cracking carbon obtained through modification treatment to obtain single-stage core-shell structure titanium alloy powder of pre-cladding high-activity site amorphous cracking carbon nano particles, wherein the high-activity site amorphous cracking carbon obtained through modification treatment is of a nearly spherical amorphous and microcrystalline structure, the average granularity is smaller than 100nm, and the addition amount is smaller than 1% of the mass of the titanium alloy powder; Step two, carrying out flow friction coating treatment on the single-stage core-shell structured titanium alloy powder pre-coated with the high-activity site amorphous cracking carbon nano particles obtained in the step one and a high-activity high-dispersion boron source obtained through modification treatment to obtain carbon and boron coated multi-stage core-shell structured titanium alloy powder, wherein the high-activity high-dispersion boron source obtained through modification treatment is boron simple substance or boron-containing compound, and the addition amount is less than 0.5% of the mass of the titanium alloy powder; The high-activity site amorphous cracking carbon obtained after the modification treatment in the first step and the high-activity high-dispersion boron source obtained after the modification treatment in the second step adopt modification treatment methods of ultrasonic irradiation, plasma irradiation or mechanical friction treatment, wherein the rotating speed of the mechanical friction treatment is less than 300r/min; Carrying out low-temperature short-time large-pulse current auxiliary vacuum hot-pressing sintering on the carbon and boron coated multi-stage core-shell structure titanium alloy powder obtained in the step two to obtain a three-dimensional multi-stage multi-scale heterogeneous phase structure blank, wherein the temperature of the low-temperature short-time large-pulse current auxiliary vacuum hot-pressing sintering is 800-1100 ℃, and the sintering pressure is greater than 10MPa; The three-dimensional multi-stage multi-scale heterogeneous titanium-based composite material comprises a four-dimensional multi-stage multi-scale heterogeneous structure, wherein the three-dimensional multi-stage multi-scale heterogeneous structure comprises a shell ultrafine titanium boride fiber structure, an in-shell beta titanium wrapped alpha-phase grain lamellar structure, an alpha-phase inner dispersion nano titanium carbide three-dimensional multi-stage multi-scale heterogeneous structure and interweaving of multi-stage dislocation and dislocation cell structures, the three-dimensional multi-stage mixed heterogeneous titanium-based composite material has tensile strength of 1430MPa 1605MPa and elongation of 7.5% -9%.
2. The method for preparing the ultra-high-strength plastic three-dimensional multi-stage mixed heterogeneous titanium-based composite material according to claim 1, wherein in the first step, the titanium alloy powder is near alpha titanium alloy or (alpha+beta) titanium alloy, and the titanium alloy powder consists of the following components in percentage by mass.
3. The ultra-high-strength plastic three-dimensional multi-stage mixed heterogeneous titanium-based composite material is characterized by being prepared by the method of claim 1 or 2.

Description

Ultra-high-strength plastic three-dimensional multistage mixed heterogeneous 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 an ultra-high-strength plastic three-dimensional multi-stage mixed heterogeneous titanium matrix composite material and a preparation method thereof. Background Titanium and titanium alloys have many advantages of low density, high strength, high temperature resistance, low temperature resistance, corrosion resistance, non-magnetism, small linear expansion coefficient, and the like, in particular, the specific strength is almost the highest among the existing metal materials, and secondly, the titanium and titanium alloys have higher corrosion resistance, particularly in seawater and ammonia-containing media, and the corrosion resistance is particularly outstanding. In addition, titanium alloys have higher heat resistance than aluminum alloys and magnesium alloys, and are widely used in the fields of aviation, aerospace, and the like. With the rapid development of these industries, titanium and titanium alloy materials with common structures have been difficult to meet the urgent demands of civil use, military industry, national defense and other fields for higher plasticity of titanium materials. The design and preparation of the titanium-based composite material are considered as important ways for obtaining the powder metallurgy titanium-based material with excellent comprehensive performance, and are important development trends of titanium and titanium alloy materials. Many researchers or technicians use titanium carbide, titanium silicide, titanium boride, diamond, graphene, carbon nanotubes, carbon onion, MAX ceramics, intermetallic compounds, and the like as the reinforcement phase of titanium-based composites. However, the traditional reinforcing phases are enriched at the titanium matrix shell due to the problems of large granularity, poor dispersibility, easy agglomeration, low activity, difficult dissolution and diffusion and the like, so that on one hand, the reinforcing effect cannot be fully exerted, on the other hand, the agglomerated large particles become crack sources in the material re-deformation process, and the agglomerated large particles also cause difficulty in coordination of the plug and deformation of dislocation, finally, the elongation of the material is seriously reduced, and the preparation of the high-strength plastic-matched titanium matrix composite material is difficult to realize. For example, in the current relatively popular graphene reinforced titanium-based composite material, graphene is easy to agglomerate and difficult to disperse uniformly, so that agglomeration and enrichment are caused at the shell of a titanium matrix, cracks are generated and elongation is drastically reduced in the deformation process due to the agglomeration layer of graphene and extremely weak van der Waals force binding force between layers, and the scale of powder/shell is often tens of micrometers, so that enrichment of a reinforcing phase at the shell is caused, and the reinforcing effect of most of in-shell and intra-crystal positions cannot be achieved. Some technicians also improve the problem of strong plastic matching of the titanium-based composite material through the design of a core-shell structure, a layered structure and other tissue structures, but still have difficulty in solving the problem of serious plastic reduction when the strength is improved. Currently, how to achieve ultra-high-strength plastic properties is a "bottleneck" in the design and preparation of titanium-based composite materials. Disclosure of Invention The invention aims to solve the technical problem of providing a preparation method of an ultra-high-strength plastic three-dimensional multi-stage mixed heterogeneous titanium-based composite material aiming at the defects of the prior art. According to the method, high-activity site amorphous cracking carbon obtained through modification treatment and a high-activity high-dispersion boron source obtained through modification treatment are taken as reinforcing phase precursors, the reinforcing phase precursors are sequentially coated on a titanium alloy powder matrix, and a multi-stage multi-scale multi-heterogeneous phase structure is constructed in four dimensions by combining sintering and thermal deformation treatment, so that a three-dimensional multi-stage mixed heterogeneous titanium-based composite material with ultrahigh strong plasticity is obtained. In order to solve the technical problems, the technical scheme adopted by the invention is that the preparation method of the ultra-high-strength plastic three-dimensional multi-stage mixed heterogeneous titanium-based composite material is characterized by comprising the following steps of: carrying out flow friction