Study On Design,Preparation,Microstructure And Properties Of CuCoNiFe Multi-Principal Alloy Hollow Microlattices Materials

Material lightweighting plays an important role in the industry.With the development of the demand for structurally and functionally integrated materials,it is difficult to meet the future application of the materials by simply reducing the mass.Strength,corrosion resistance,heat dissipation and other multi-functional coupling of metallic hollow microlattices material can continue the industrial design ideas,and take into account the material design,structural design,functional design,is a new type of material-structure-functional integration of ultra-lightweight materials.This paper is based on the realization of low density,high pressure resistance,corrosion resistance,and strong heat dissipation of metallic hollow microlattices material.In terms of structure,the single cell structure of the material is designed to solve the problem of structure-property compatibility,and the structural optimization design method of simple cubic structure is proposed.In terms of materials,a multi-principal alloy coating with controllable composition and ratio prepared by the aluminum-induced electroless plating method combined with the thermal diffusion alloy method is proposed in order to solve the problem that the conventional electroless plating method is limited by the type of co-deposited alloy.The CuCoNiFe alloy is selected as the material design target based on the requirements of corrosion resistance,high toughness and heat dissipation.In the aspect of material design,the pure metal coating of mu ltiple metal elements was prepared by Al-induced electroless plating method,the deposition principle of Al-induced electroless plating and the possibility of multilayer deposition were explored,the diffusion mechanism and process method of thermal diffusion alloying of multilayer coating were analyzed.This provides an experimental basis and theoretical support for the material design of multi-component alloyed hollow microlattices materials.The coatings prepared by Al-induced electroless plating have good quality,controllable thickness,pure composition and stable properties.It is an important base material for alloying as a multi-component composition.According to the design method of multi-component alloy coating,Cu Co Ni alloy coating was prepared.The coating has a silver-white metallic luster with typical metallic characteristics,good quality and stable microstructure.The coating is composed of two FCC solid solution phases,Cu Ni phase and Cu Co Ni phase,and has excellent corrosion resistance.The self-corrosion potential was-0.218 V and the self-corrosion current density was 2.72μA/cm~2 of the alloy coating sample with 6 h of thermal diffusion.In the aspect of structural design,the effect of structural parameters on the compression performance and heat transfer performance of metallic hollow microlattices materials was explored by combining numerical simulation and practical experiments.Based on the wall thickness of 0.01 mm,node spacing of 2mm and tube inner diameter of 1 mm,increasing or decreasing the dimensional values can effectively improve the compressive capacity of the structure.At the same time,the size scale of the structure also has a significant effec t on the compressive capacity.The higher the number of nodes,the better the compressive capacity is.When a metallic hollow microlattices material is subjected to compressive stress,the node where the hollow tube meets the hollow tube is the location of the stress-strain concentration As an example,the nickel-based hollow microlattices material exhibits layer-by-layer collapse along the nodes and 45°oblique fracture in the form of compression fracture depending on the apparent density.The heat transfer capacity is influenced by factors such as the heat transfer cross-sectional area and material of the material.Taking copper-based hollow microlattices material as an example,the thickness of the hollow tube wall directly affects the heat transfer capability of the material.The heat dissipation capacity of the material is mainly contributed by the low solid volume and the high heat dissipation surface area.In addition,the complex and dense structural form has a significant side effect on the forced cooling.Combining the material design and structure design results,this paper systematically investigates the overall preparation method of multi-alloy hollow microlattices materials,and prepared a simple cubic structure of CuCoNiFe multi-principal alloy hollow microlattices materials with node spacing L of 4 mm,tube diameter D of 0.5 mm,and wall thickness t of 0.1 mm as a single cell size.The design results of material-function integration of multi-principal alloy hollow microlattices materials are verified.The CuCoNiFe alloy hollow microlattices material with apparent dimensions of 32 mm×32 mm×28 mm and apparent density of 0.415 g/cm~3 was able to withstand a maximum compressive load of 1496.10 N,exhibiting a compressive modulus of 26.96 GPa,a maximum engineering stress of1.46 MPa,and a specific strength reaches 3518.07 N·m/kg.The specific strength of the material is much stronger than that of a typical monometallic-based material.The material exhibits flexural deformation and plastic deformation when subjected to maximum compressive load.The alloying of the CuCoNiFe multi-principal components significantly improves the characteristics of brittle fracture of the nickel-based hollow microlattices material.By comparing the heat transfer performance of the metallic hollow microlattices materials,although showing poorer heat transfer performance than the samples made of copper,the CuCoNiFe multi-principal alloy hollow microlattices material showed the same heat transfer capability as the other pure metal samples.The CuCoNiFe multi-principal alloy hollow microlattices sample showed the best heat dissipation ability by forming a uniform temperature field inside the sample under the side forced air cooling condition.The specific heat dissipation efficiency under air cooling is 0.072(℃·cm~3)/(g·s),and the specific heat dissipation efficiency under forced ai r cooling can reach 1.55(℃·cm~3)/(g·s).