Matrix Grain Size Research Articles

Influence of TiC and Ni addition on densification and mechanical properties of microwave sintered ZrB2 based composites

The effects of TiC (10–30 vol%) and Ni (1–2 vol%) incorporation on densification, microstructural evolution and mechanical properties of microwave sintered ZrB2 matrix-based composites were investigated in the present study. The findings reveal that TiC addition significantly improves the densification of ZrB2 based composites, while the inclusion of Ni further improves densification of ZrB2–20 vol% TiC composite by reducing porosity and restricting the grain growth of both ZrB2 and TiC phases. Additionally, the highest Vickers hardness of 22.25 ± 1.33 GPa and compressive strength of 1556.2 ± 40.17 MPa were obtained for the ZrB2–20 vol% TiC composite due to lower porosity, lower grain size and higher TiC diffusion in the ZrB2 matrix. The fracture toughness enhanced with TiC and Ni addition and the maximum fracture toughness was observed as 6.66 ± 0.47 MPa.m0.5 along with the highest critical energy release rate of 95.16 ± 11.68 J/m2 for the ZrB2–20 vol% TiC-2 vol% Ni composite owing to the activation of toughening mechanisms like crack bridging, crack deflection and open pores as crack deflectors. Nanoindentation studies revealed significant improvements in elastic modulus and stiffness with the addition of TiC. The maximum elastic modulus and stiffness were observed as 482.91 ± 36.36 GPa and 237.24 ± 20.28 μN/nm for ZrB2–20 vol% TiC composite. The study highlights the potential of incorporating metallic additives with secondary reinforcements to enhance the mechanical properties and microstructures of ZrB2 matrix, making them potential materials for high-temperature applications such as control surfaces, nose caps and leading edges of supersonic aircrafts.

Fabrication of Ni–ZrO2 nanocomposites through a new electroforming bath and Assessment of their morphology, wear, and corrosion resistance

Nowadays, researchers are looking for ways to produce complex tools and pieces with high precision at a low cost. In recent decades, electroforming has been an important and stable technique for producing composite parts. In this research, Ni–ZrO2 nanocomposite foils were fabricated by using a nickel-chloride bath through electroforming, a bath not previously utilized for this purpose. In this study, the effects of ZrO2 concentration and direct current density on the volume percentage of ZrO2 nanoparticles and the grain size of the nickel matrix of foils are also investigated. The sample with 13.65 vol % nanoparticles had the highest volume percentage and the minimum nickel grain size of 516.9 nm, which is almost 46 % smaller than the grain size of pure nickel foil. The wear and corrosion behavior of the foils were examined using a pin-on-disk wear test, potentiodynamic polarization, and impedance spectroscopy analysis. The results showed considerable improvement in the wear and corrosion resistance of the Ni–ZrO2 samples compared to the pure electroformed nickel. The nanocomposites exhibit a lower friction coefficient than pure nickel, with a maximum reduction of 44 %. A composite specimen of Ni–ZrO2 had 2.5 % lower corrosion density and 596 % higher charge transfer resistance compared to pure nickel. It was concluded that the nickel-chloride bath has an excellent potential to produce composite nickel foils with acceptable brightness, satisfactory wear, and corrosion resistance.

Mechanism Analysis for the Enhancement of Low-Temperature Impact Toughness of Nodular Cast Iron by Heat Treatment.

The low-temperature impact toughness of nodular cast iron can be significantly enhanced by heat treatment, and thus meet the severe service requirements in the fields of high-speed rail and power generation, etc. In order to explore the enhancement mechanism, microstructure, hardness, composition and other characteristics of as-cast and heat-treated nodular cast iron is systematically tested and compared by optical microscopy, microhardness tester, EBSD, SEM, electron probe, and impact toughness testing machine in this study. The results show that heat treatment has little effect on the morphology and size of graphite in nodular cast iron, ignores the effect on the grain size, morphology, and distribution of ferritic matrix, and has little effect on the hardness and exchange of elements, while it is meaningful to find that heat treatment brings about significant decrease in high-angle grain boundaries (HAGB) between 59° and 60°, decreasing from 10% to 3%. Therefore, the significant enhancement of low-temperature impact toughness of nodular cast iron by heat treatment may result from the obvious decrease in HAGB between 59° and 60°, instead of other reasons. From this perspective, the study can provide novel ideas for optimizing the heat treatment process of nodular cast iron.

Hierarchical nano-/micro-architecture phonon scattering of p-type Bismuth telluride bulk composites with Ag-TiO2 nano particles synthesized by fluidized bed spray coating method

We optimize the thermoelectric (TE) properties by minimizing thermal conductivity utilizing by hierarchical phonon scattering from long to mid wavelength of phonon in p-type Bi0.4Sb1.6Te3.4 (BST) composite with nano Ag-coated TiO2 (Ag/TiO2). We employed an Ag nano particle (20 nm) modulation into TiO2 (500 nm) particles by spray coating method and dispersed in a p-type Bi0.4Sb1.6Te3.4 (BST), giving rise to a hierarchical architecture from nano to micro scale. The nano particle modulation of Ag/TiO2 particles decreases grain sizes of p-type BST matrix. The hierarchical structure of modulating nano particles and small grain sizes of the matrix significantly decreases lattice thermal conductivity due to wide range of wavelength phonon scattering, resulting in the enhancement of thermoelectric performance over a large temperature range. The maximum thermoelectric figure-of-merit zT value reaches to 1.28 for 0.9 wt% Ag/TiO2 modulation doping, which is superior to the other reported ones. The optimized modulating Ag/TiO2 nano-particle dispersion effectively maintains the valence band structure while concurrently mitigating the scattering of charge carriers. Therefore, the nano particle modulation by spray coating method is an effective way to manifest hierarchical architecture from nano to micro-scale phonon scattering, which can be applied in thermoelectric materials design and process.

The effect of multi-directional compression on mechanical properties and corrosion properties of Cu–Fe composite

Cu–Fe composite is a promising candidate for electromagnetic shielding material, while it exhibits poor corrosion resistance due to the different corrosion potential of Fe particles and Cu matrix. In this study, a Cu–Fe composite was processed by multi-directional compression. The effect of multi-directional compression on the mechanical properties of the Cu–Fe composite was evaluated by the tensile test, and the effect of multi-directional compression on the corrosion properties was evaluated by the weight loss test and electrochemical measurement. After 12 compression passes, the yield strength of the Cu–Fe composite is more than two times higher than that of the initial state, and the corrosion rate decreases to nearly half compared to the initial state. Microstructure examination reveals that high density of twin boundaries were generated by multi-directional compression, which could effectively refine the grain size of Cu matrix and improve the strength of Cu–Fe composite. In addition, twin boundaries would reduce the Volta potential difference between Cu matrix and Fe particles, which could effectively inhibit galvanic corrosion, finally leading to a high corrosion resistance of the Cu–Fe composite.

The effect of low-energy high-current pulsed electron beam irradiation on the structure, phase composition and mechanical properties of Ni3Al and Ni3Al-TiC composites

Using scanning and transmission electron microscopy, X-ray diffraction, indentation and bending tests we studied the evolution of microstructure, phase composition and mechanical properties of TiC-free Ni3Al and Ni3Al-TiC composites (TiC content was 10 and 30 vol%) fabricated by self-propagating high-temperature synthesis (SHS) under pressure induced by low-energy high-current pulsed electron beam (LEHCEB) irradiation with the surface energy density of 8, 12 and 18 J/cm2. It was found that the irradiation results in the improvement of phase composition of the near-surface layer by way of the increase of yield of SHS reaction. LEHCEB irradiation enables formation of nanocomposite structure in the near-surface layer of Ni3Al-TiC composites with decreased grain size of Ni3Al matrix, refined TiC particles and increased volume fraction of TiC. This structure leads to the increase of microhardness but decrease of strength under bending. Two mechanisms of TiC particles refining are suggested. The effect of surface energy density on the manifestation degree of the found phenomena is discussed. The contribution of different hardening mechanisms to the overall hardening is considered.

Influence of element Bi and MAO treatment on the corrosion resistance of magnesium implant

Mg-Bi alloy was prepared by metallurgical method and then surface treated by micro-arc oxidation (MAO) in this work. The influence of element Bi and MAO treatment on the corrosion resistance of Mg matrix was investigated. The results showed that, element Bi can obviously improve the corrosion resistance of Mg (2–3 orders of magnitude), which may be due to that the formation of Mg3Bi2 particles can refine the grain size of the Mg matrix. After MAO treatment, the corrosion resistance was further enhanced and the MAO treated Mg-Bi showed the best corrosion resistance, however the improvement of MAO coatings is not very huge (about two times of Mg-Bi alloy). Considering the nonuniform structure, easy degradation and instability of coating materials, Mg-Bi alloy without MAO treatment has a greater potential to be used as an implant material in clinics.

Rapid solidification induced low lattice misfit and associated enhancement of mechanical property in the NiCoCr medium entropy alloy

Medium entropy alloys (MEAs) have a high potential in industrial applications due to their excellent mechanical properties. Here we report a strategy to improve the ductility of the Ni40Co30Cr20Al5Ti5 MEAs by rapid solidification (RS). The as-cast alloy is composed of dendritic structure and L12 nano-precipitates. After RS, the lattice misfit of precipitate and matrix is reduced from 0.251 % to 0.167 %, and the size of the precipitate decreases from 85 nm to 28 nm. Meanwhile, RS also reduces the grain size of matrix. Gliding dislocation can cut through precipitates with low lattice misfit and smaller size, which can avoid strain accumulation and prevent crack initiation at the precipitate-matrix interfaces. Compared with the as-cast alloy, the ductility of the RS alloy is increased by 17 %–42 % without a decrease in strength. Our results can provide a guidance for other experiments using the RS technology (laser cladding, magnetron sputtering, etc.) to achieve the strength-ductility balance in the MEAs.

Tailoring the enhanced mechanical behavior of 6061Al composites via nano SiCp and micron B4Cp addition

In this work, the hybrid micron B4C particles (m-B4Cp) and nano SiC particles (n-SiCp) reinforced 6061Al matrix composites were prepared by powder metallurgy. The synergistic effects of hybrid m-B4Cp and n-SiCp were investigated. The results showed that m-B4Cp were well dispersed in the matrix, while n-SiCp were uniformly distributed inside the grains as well as at the grain boundaries. The coupled addition of n-SiCp and m-B4Cp significantly refined the grain size of matrix from 3.60 μm to 0.91 μm. The synchrotron X-ray computed tomography (SR-CT) revealed that the volume of pores increased with increase of particle content. Compared with the composites reinforced with only one type of particle, the 6061Al composites reinforced with micro and nano dual-size particles possessed higher tensile strength, while maintaining reasonable plasticity. The strengthening contributions to the yield strength improvement of 6010Al matrix composites reinforced with micro and nano dual-size particles are resulted from thermal expansion mismatch strengthening, fine grain strengthening and Orowan strengthening caused by n-SiCp.

Investigating the strengthening and deformation behavior of B2-strengthened high entropy alloys with high Co and Al contents

A never-ending challenge for materials scientists is to design alloys with excellent strength-ductility combinations. Here, a systematic study on B2 precipitation and mechanical behaviors of a high Co and Al content high entropy alloy (HEA) annealed at 700–1000 °C was investigated. The alloy annealed at 700 °C (denoted as A700) exhibited a high yield strength of 1820 ± 22 MPa and an ultimate tensile strength of 1884 ± 21 MPa, which can be mainly attributed to the dislocation, ultra-fine grain and B2-strengthening. With the annealed temperature increasing to 900 °C (denoted as A900), the FCC matrix has been full-recrystallized, and the grain size of FCC matrix increases from 0.21 μm to 2.8 μm. The volume fraction of the B2 phase decreases slightly from 58% to 53%. As a result, the A900 alloy displays a yield strength of 1038 ± 17 MPa and tensile ductility of 28 ± 2.3%. The deformation and strengthening mechanisms are investigated by microstructural characterization and theoretical calculations. This work will provide a basis for the composition and structural design of B2-strengthened HEAs.

Ultrasonic-assisted connection of Cu/Cu structure using Sn58Bi solder enhanced by B4C nanoparticles

In order to enhance the joint performance, the Cu/Sn58Bi-0.6B4C/Cu 3D structure was obtained by ultrasonic-assisted connection. The influence of ultrasound on the solder and its wettability, as well as the microstructure, interfacial IMC structure, and mechanical properties, was investigated. It is indicated that ultrasonic cavitation improves the crystal structure of the solder alloy by refining grain size and making the microstructure more uniform. The ultrasound also changes the preferred orientation of β-Sn and Bi phases, and increases the low-angle grain boundaries and local orientation differences for improved alloy strength. Additionally, the ultrasound promotes the molten solder spreading on the Cu substrate. The microstructure of the filler metal layer is improved by ultrasonic, and the Cu6Sn5 compounds floating in the solder matrix act as the strengthening phase. Cavitation bubbles erosion increases the contact area between the solder and Cu substrate. The audiogenic high temperature reduces the IMC thickness difference at both ends of the joint caused by the temperature gradient. Besides, the grain size in the solder matrix and interfacial IMC is refined with increased supercooling. The ultrasound strengthens joint shear strength significantly and improves the potential path for crack propagation. The appearance of dimples in the fracture alters its mode from being typically brittle to a mixed ductile and brittle fracture. The above enhancement will be further improved with the appropriate extension of ultrasonic time. We hope to strengthen joint performance by ultrasound, and provide reference for future research and application combining soldering with ultrasonic technology.

Hybrid influences of interphase and grain-size on material responses of CNT-reinforced metal matrix composites

In this investigation, a theoretical model is developed to consider the coupled influence of interphase and grain-size of metal on the nonlinear response of CNT-reinforced MMCs. A multiscale theoretical framework based on the energy-based effective strain method and the field fluctuation method is established. The second-order stress moment and dislocation density model are also adopted to predict the entire grain-size dependent stress-strain relations. The energy-based effective strain method is proposed to better exhibit the energy stored in the three-phase composites by replaced average-strain. The microstructure variables include volume fraction, moduli of interphase, geometrical size factor, aspect ratio of CNTs, and grain size in metal matrix. The accuracy of the present predictions is verified by some available experimental data. As a result, the proposed model can be used to define the mechanical behavior and make an optimum design of CNT reinforced MMCs as well as advanced engineering composites.

Composition and phase structure dependence of magnetic properties for Co2FeCr0.5Alx (x=0.9, 1.2) multi principal component alloys

This article investigates the microstructure evolution, phase formation, and magnetic properties of Co2FeCr0.5Alx (x = 0.9, 1.2) complex component alloys, as a function of heat treatment temperatures (at 500, 600, 700, and 1150°C), using XRD, optical microscopy, electron microscopy and vibrating sample magnetometry (VSM). The alloy with 20.4 at% Al (x= 0.9), identified here as C1, consisted of microscale BCC1 phase and BCC nanoscale particles containing mainly Fe and Cr, and B2 matrix with mainly Al and Co. Partial transformation of the BCC1 phase to an FCC phase was observed at 700°C and full transformation at 1150°C, through twinning. For the sample with 25.5 at% Al (x= 1.2), identified as sample C2, there were only nanoscale BCC particles in the B2 matrix with the same element segregation between the phases as C1. This increase in Al (from x= 0.9 to 1.2) content stabilised the B2 matrix phase, reduced the grain size, and increased both saturation magnetisation (Ms) and coercivity (Hc). Moreover, increasing the heat treatment temperature resulted in an increase in grain size of the B2 matrix, volume fraction and average size of the micro BCC 1 and nanoscale BCC phases for both C1 and C2, which also modified the soft magnetic properties, with Ms and Hc increasing up to 600°C followed by a decrease until 1150°C. Using the structural information as inputs for density functional theory calculations of Hc and Ms, it has been found that the Hc is influenced by the grain size of the matrix, and the volume fraction and size of the BCC1 phase at temperature higher than 600°C for C1 and 700°C for C2, but is controlled by nanoscale BCC particles below these temperatures. The Ms is controlled by the elemental diffusion and segregation. Thus, the best combination of Hc and Ms was seen with antiferromagnetic Cr segregated and partitioning in the microscale BCC1 phase, and a B2 matrix with less Cr rich precipitation, formed at 500°C, where the misfit strain between B2 matrix and nanoscale BCC was low.

Study on the enhancement mechanism of (TiC + B4C)/6061Al composite fabricated via vacuum hot-press sintering

In order to explore the hybrid enhancement mechanism of TiC and B4C in 6061Al, the (TiC + B4C)/6061Al composite was fabricated by the vacuum hot-press sintering method at 580 ℃ and 30 MPa, and the microstructure, distribution of elements and tensile properties were analyzed. The results showed that the microstructure of the composite was dense and no defects such as porous were found. Due to the doping of B4C and its decomposition effect in the aluminum matrix, the diffusion of B and C to the aluminum matrix and TiC appeared in the composite. The addition of TiC and B4C particles not only refined the grain size of the aluminum matrix, but also changed the distribution of the Mg2Si phase along the grain boundary inside the aluminum matrix. Due to the addition of particles, the fracture mode of 6061Al changed from ductile fracture to ductile fracture of aluminum matrix and cleavage fracture of particles.

Preparation and toughness mechanism of in-situ Ti3AlC2 enhanced and toughened TiAl3 matrix composites

In this paper, dense MAX phase Ti3AlC2 enhanced and toughened TiAl3 matrix composites with mass fractions of 10∼40% were prepared by in-situ reaction via powder metallurgy route which using TiH2, Al and TiC powder as the starting materials. Then, the microstructure and phase structure of the composites were characterized, and the relationship between microstructure, mechanical properties and fracture mechanism was systematically investigated. The results show that the lath-like (micron level) and fine-needle-like (submicron level) reinforcements Ti3AlC2 are uniformly distributed in TiAl3 matrix. With the increases of mass fraction of reinforcements, the average grain size of the TiAl3 matrix decreases remarkably from 7.6 μm to 4.8 μm, indicating that the reinforcements Ti3AlC2 can effectively refine the matrix grains and plays a good pinning effect on the TiAl3 matrix. The prepared Ti3AlC2/TiAl3 composite with 30% mass fraction exhibits excellent comprehensive mechanical properties: the Vickers hardness, flexural strength, fracture toughness is 575 ± 5 HV, 470 ± 18 MPa, and 3.83 ± 0.05 MPa m1/2, 14.1%, 174.9% and 117.6% higher than that of the pure TiAl3 matrix, respectively. Both the strengthening and toughening effects are significant. The strengthening mechanism are fine grain strengthening and deformation strengthening, while the toughening mechanism is a synthetic effect in terms of crack deflection, crack bifurcation, grain refinement and stress-induced microcrack. Fracture analysis shows that the fracture mechanism is transgranular (cleavage) fracture.

Microstructural insights into EUROFER97 batch 3 steels

Extensive analytical electron microscopical analyses were carried out from the micrometer scale down to the nanometer scale to characterize three variants of the 9% reduced activation ferritic martensitic (RAFM) steel EUROFER97/3. No huge microstructural differences were observed between the three grades. Electron backscatter diffraction (EBSD) in a scanning electron microscope (SEM) was used to determine prior austenite grain (PAG) and lath sizes of the martensite matrix. The PAG size varied between 4.5 µm and 6.5 µm depending on the reconstruction algorithm. Furthermore, the martensitic lath sizes determined by SEM-EBSD are only half or 1/3 of that determined manually from transmission electron microscopy (TEM) images, which might be related to the limited statistics in this type of TEM data evaluations. The SEM-EDX shows that M23C6-type phases are preferentially located on lath and grain boundaries due to preferential diffusion of elements like Cr, W, and C to and along grain boundaries, which agrees with TEM-EDX measurements. TEM techniques like STEM-EDX and high-resolution TEM were used to describe the occurring precipitates i.e., M23C6, VN, TaC morphologically, structurally, and chemically. In addition, the thermodynamic calculations were carried out to explain phase formation, phase fraction and phase composition. The results are in good agreement with the experimentally determined values. These results will provide a profound basis to explain the mechanical performance of these materials. Furthermore, it will lay a good reference basis of comparison for the material after neutron irradiation.

Improvement in tensile strength of GH3536-TiB2 composites fabricated by powder metallurgy

To further improve the tensile strength of the GH3536 alloy (Hastelloy X), the GH3536-1 wt%TiB2 composites were prepared successfully by powder metallurgy. The results show that numerous M3B2 and TiC particles precipitated in the GH3536-TiB2 composite system. Interestingly, M3B2 particles were distributed along the grain boundaries in the composites, while TiC particles were in-situ synthesized along the prior particle boundaries of the spherical GH3536 powders. In addition, the grain size of the composite matrix was decreased to 6.7 μm compared with that of the GH3536 alloy (9.5 μm) since the grain growth being hindered by numerous intergranular phases, which further caused the increase of twin boundary proportion (from 26.5% in the GH3536 alloy to 38.8% in the composites). Consequently, the yield strength of the prepared composites was improved to 361 MPa and 298 MPa, respectively, from 240 MPa and 200 MPa, representing a roughly 50% improvement over the GH3536 alloy at 700 °C and 815 °C. The improvement in high-temperature strength is mainly ascribed to grain refinement strengthening, twin strengthening, hetero-deformation-induced hardening, and the additional grain boundary strengthening effect induced by secondary phases.

Effect of supercritical carbon dioxide soft particles on incorporation of titanium dioxide nanoparticles into nickel matrix

This study reports effects of physical conditions of the supercritical carbon dioxide (SC–CO2) soft particles in co-electrodeposition of Ni–TiO2 composite coatings. The SC-CO2 soft particles are SC-CO2 micelles suspending in the emulsified electrolyte capable to improve transfer efficiencies of materials in the electrolyte. Physical conditions of the SC-CO2 soft particles are manipulated by varying the applied pressure and the CO2 volume fraction in the emulsified electrolyte. The effects on the surface morphology, Ni grain refinement, incorporated TiO2 amount, TiO2 dispersity in the Ni matrix, the micro-hardness and corrosion behaviors of the Ni–TiO2 composite coatings are investigated. Following an increase in the CO2 volume fraction, the average grain size of the Ni matrix is coarsened, the TiO2 content is lowered, and a more uniform dispersion of the TiO2 nanoparticles in the Ni matrix is observed. Also, the micro-hardness decreases from 1061 HV to 872 HV as the CO2 volume fraction increases from 0.2 to 0.6. When the applied pressure increases from 9 MPa to 17 MPa, a local minimum in the average Ni grain size, a local maximum in the TiO2 content, a local maximum in the micro-hardness and a local maximum in uniformity of the TiO2 dispersity in the Ni matrix are observed.

Effect of Mg Contents on the Microstructure, Mechanical Properties and Cytocompatibility of Degradable Zn-0.5Mn-xMg Alloy.

The effect of magnesium (Mg) content on the microstructure, mechanical properties, and cytocompatibility of degradable Zn-0.5Mn-xMg (x = 0.05 wt%, 0.2 wt%, 0.5 wt%) alloys was investigated. The microstructure, corrosion products, mechanical properties, and corrosion properties of the three alloys were then thoroughly characterized by scanning electron microscopy (SEM), electron back-scattered diffraction (EBSD), and other methods. According to the findings, the grain size of matrix was refined by the addition of Mg, while the size and quantity of Mg2Zn11 phase was increased. The Mg content could significantly improve the ultimate tensile strength (UTS) of the alloy. Compared with the Zn-0.5Mn alloy, the UTS of Zn-0.5Mn-xMg alloy was increased significantly. Zn-0.5Mn-0.5Mg exhibited the highest UTS (369.6 MPa). The strength of the alloy was influenced by the average grain size, the solid solubility of Mg, and the quantity of Mg2Zn11 phase. The increase in the quantity and size of Mg2Zn11 phase was the main reason for the transition from ductile fracture to cleavage fracture. Moreover, Zn-0.5Mn-0.2Mg alloy showed the best cytocompatibility to L-929 cells.

Study on the phase structure of the interface zone of Cu–Al composite plate in cast-rolling state and different heat treatment temperatures based on EBSD

The phase structure in the interface zone of Cu–Al composite plate was studied by EBSD after casting and rolling and different heat treatment temperatures. The grain sizes of the matrix and intermetallic compounds in the interface zone were analyzed statistically. The spatial distribution characteristics of the transverse, rolled, normal and various phases were characterized by inverse pole diagram. The results show that with the increase of heat treatment temperature, the phase of the interfacial area of the composite plate is rearranged, the residual stress can be released, and the zero resolution decreases. The interface zone of cast-rolled Cu–Al composite plate is composed of a layer of intermetallic compound, which is Al2Cu; Two layers of intermetallic compounds, both Al, were formed in the interfacial area after heat treatment at 300 °C and 400 °C Al2Cu and Al4Cu9;After heat treatment at 450 °C, the interface region is composed of three layers of intermetallic compounds, which is Al2Cu, AlCu, Al4Cu9;The grain size of copper matrix is obviously larger than that of aluminum matrix. Matrix aluminum, matrix copper, Al2Cu.The average grains of Cu are mostly large Angle grain boundaries, and the orientation difference of adjacent grains in aluminum layer is much smaller than that in copper layer. After heat treatment at 300 °C for 1 h, the recrystallization degree of the interface zone of Cu–Al composite plate is low. After heat treatment at 400 °C for 1 h, the recrystallization in the interfacial zone of Cu–Al composite plate is not complete; After annealing at 450 °C for 1 h, the subgrain boundaries in the aluminum layer grow up, and LAGB is basically converted to HAGB. The distribution characteristics of the characteristic appearance direction in the crystal space of each phase were characterized under the conditions of casting and rolling and different heat treatment temperatures. At the same time, the research results provide theoretical basis and scientific title for optimizing the preparation process and high-end application of Cu–Al composite plate.