Three-dimensional lattice material and its preparation method based on electron beam selective melting technology

Abstract

The invention provides a three-dimensional lattice material based on electron beam selective melting technology, which includes a three-dimensional structure formed by superimposing a plurality of basic units. The basic unit is composed of a plurality of isosceles triangles. The tops of the isosceles triangles overlap each other, the waists of the isosceles triangles are solid rods, the rest of the isosceles triangles are phantoms, and there is a waist overlapping between two adjacent isosceles triangles; the three-dimensional three-dimensional The material of the structure is pure titanium or titanium alloy. The invention also provides a method for preparing the lattice material. The three-dimensional lattice material provided by the present invention is mainly composed of a plurality of basic units superimposed. After being processed by electron beam selective melting, vacuum annealing, and chemical corrosion, it has stable compression performance, and its compression curve shows obvious plasticity. The yield platform shape provides a stable and reliable calculation basis for structural designers.

Description

technical field [0001] The invention belongs to the technical field of additive manufacturing of metal components, and in particular relates to a three-dimensional lattice material based on electron beam selective melting technology and a preparation method thereof. Background technique [0002] Three-dimensional lattice material is a typical structural-functional integration material, which belongs to the category of porous materials. It is an ordered porous material with high porosity and periodic structure composed of nodes and connecting rod units. Compared with traditional metal foam and metal honeycomb materials, three-dimensional metal lattice materials based on light metals such as titanium and aluminum alloys have higher specific strength, specific stiffness and energy absorption per unit mass, especially when the relative density is relatively high. At a low temperature, the three-dimensional lattice material has particularly outstanding mass efficiency and perform...

AI Technical Summary

Problems solved by technology

However, the existing results show that the fracture mode of the titanium-based three-dimensional lattice material prepared by the electron beam selective melting molding technology is brittle fracture, and the compression stress-strain curve shows jagged fluctuations, and the reproducibility of such fluctuations Poor, unable to provide designers with reliable mechanical performance parameters, which greatly limits the application of electron beam selective melting molding technology in energy absorption, medical implants and other industries

[0005] From the above analysis, it can be seen that the traditional preparation method not only brings great difficulties to the selection of matrix materials and the design of material properties, but also makes it difficult to adjust the material properties by adjusting the unit cell structure. The preparation of three-dimensional lattice materials in the form of unit cells, but the repeatability of material properties is poor, and the popularization and application of three-dimensional metal lattice materials cannot be realized

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