The Effect Of Reinforcement Characteristics On Properties Of Configurational Ni₂B/Cu Composites

With the rapid development of China’s manufacturing industry,the demand of high strength and high conductivity copper materials for modern industrial products such as high-speed iron bow system and high sensitive radar is more and more urgent.It is found that the configuration design of microstructure is more conducive to realizing the comprehensive configuration of excellent properties such as high strength and high conductivity.Therefore,Ni₂B,which has high electrical conductivity and better wettability with matrix interface,is selected as the reinforcement of copper matrix,and the configuration design of Ni₂B/Cu composite material is expected to meet the requirements of harsh production conditions in modern industry.Previous scholars on configurational composite materials mainly through experimental design to control the characteristics of the reinforcement to explore its impact on the composite materials,because configurational composite materials in the size,shape,content and other characteristics to be considered,also must take into account the spatial configuration of the reinforcement and soft and hard phase interface properties and other factors on the composite of the intricate relationship.To solve this problem,this paper proposes to study the influence of reinforcement characteristics on the mechanical and electrical properties of configurational Ni₂B/Cu composites through finite element simulation,which can effectively reduce the research and development cost of new copper materials and reveal the mechanical and electrical mechanism from the perspective of microscopic transient,and provide theoretical basis and design ideas for the configurational Ni₂B/Cu composites.The main research work and conclusions are as follows:1.Compiled for COMSOL through independent development and can generate 30vol% randomly.Spherical particle algorithm;The boundary conditions of uniaxial tensile and conductivity testing models of composite materials were determined,and the stability of the model was verified by grid factors and geometric randomness.2.The coupling effects of interface parameters and volume fraction of Ni₂B on mechanical properties of uniform Ni₂B/Cu composites are studied.It is found that the tensile strength of the composites decreases with higher content of Ni₂B when the interface properties are poor,which reveals that the fundamental reason for the deterioration of mechanical properties is the obstruction of load transfer caused by the weak interface.The relevant parameters of Ni₂B/Cu composites were defined,and 2000 MPa is determined as the critical value of cohesion tensile strength of configurational Ni₂B/Cu composites to maintain adhesion under conventional load.3.It was found that the simulation results of the influence of reinforcement characteristics on the properties of Ni₂B/Cu composites within a given experimental range were consistent with the experimental results.The interface bonding property of the composite is poor and the internal pure copper zone electronic channel is less,which leads to its poor mechanical and electrical properties.The banded configuration composite has better interface bonding property and the bearing capacity of the banded rich zone is stronger.The special structure makes it have more pure copper zone electronic channel,so it has high strength and high conductivity.4.The average comprehensive properties of 16 groups of uniform,aggregated and banded configuration composites are 26.5,7.9 and 21.7×106 MPa2·%IACS,respectively,the average elongation is 4.28%,5.14%and 5.12%.The properties of aggregated Ni₂B/Cu composites are generally lower than those of uniform and banded composites.In terms of mechanical properties,the uniform configuration is superior to the banded configuration,with an average tensile strength of 631.4 MPa.In terms of unidirectional conductivity,the banded configuration is superior,with an average conductivity of 73.89%IACS.5.With the increase of the Ni₂B volume fraction,the comprehensive properties of the uniform composites increase first and then decrease,reaching the highest of 30.60×106 MPa2·%IACS.With the increase of the total Ni₂B content,the comprehensive performance of the aggregated composite increases first and then decreases.When the total Ni₂B content is 4%,the composite reaches the peak value of 12.80×106 MPa2·%IACS;For the banding configuration,the length-diameter ratio has the greatest influence on the comprehensive performance of the composite.The comprehensive performance reaches the peak value of 23.24×106 MPa2·%IACS at the length-diameter ratio of 20.