Microstructure Oxidation Research Articles

Comparative analysis of feeding strategies and post mortem aging time on the oxidative status and color of the longissimus thoracis et lumborum muscle in Braford steers

The impact of corn silage supplementation and post mortem aging on the antioxidant status in longissimus thoracis et lumborum (LTL) muscle was assessed using micro-spectroscopic techniques. A total of 30 Braford steers were utilized in the study. Of these, 15 animals were supplemented with corn silage for 120 days, while the remaining animals were fed exclusively on pasture. LTL steak samples were aged for 2, 7, 14, and 21 days at a temperature of 2 ± 1°C, under conditions of darkness and vacuum. Several colorimetric assays were employed to evaluate the antioxidant capacity of both enzymatic and non-enzymatic origin, as well as the levels of protein and lipid oxidation. The content of heme pigment was determined by a spectrophotometric assay, while the fluorescence fingerprint of beef was evaluated by fluorescence spectroscopy excitation-emission matrices (FEEM). Additionally, the muscle microstructure was analyzed via scanning electron microscopy (SEM). The results demonstrated that the finishing system did not exert any discernible influence on the rates of lipid oxidation, antioxidant capacity, or muscle microstructure. However, the carbonyl content and total myoglobin exhibited higher levels in the corn silage-supplemented animals. Conversely, during aging period, data revealed that lipid degradation proceeded at a faster rate than protein oxidation, accompanied by a notable enhancement in antioxidant capacity within the hydrophilic meat extracts. In contrast, the lipophilic extracts demonstrated a reduction in both enzymatic and non-enzymatic antioxidant capabilities with the progression of post mortem aging. The aforementioned alterations were accompanied by a reduction in the muscle microstructure during the aging process. The results demonstrate that finishing steers with or without corn silage over 120 days results in comparable and satisfactory beef quality after 21 days of vacuum aging. It can be concluded that 21 days of storage compensates the antioxidant status obtained by feeding strategies in fresh meat. Furthermore, SEM and FEEM techniques allowed for a precise evaluation of the microstructure and oxidative status, suggesting that these methods could be employed in future assays.

Synergistic effects of fly ash and graphene oxide composites at high temperatures and prediction using ANN and RSM approach

Fly ash (FA) is a consequence of burning coal and is widely used in construction because of its pozzolanic qualities, which increase the strength and longevity of materials. Graphene oxide (GO) is a functionalized version of graphene with low electrical conductivity, high mechanical strength, and a large surface area. By examining the behavior of fly ash and GO composites at high temperatures, new materials with improved mechanical and functional qualities that are appropriate for a range of industrial uses can be created. By improving the material quality of cement and reducing material use while boosting durability, adding graphene oxide to cement offers an opportunity to drastically lower carbon emissions. However, the entire effect is dependent on the GO emissions, manufacturing procedures, and viability from an economic standpoint; to fully reap the benefits of this novel strategy for the environment, more research and development are necessary. this paper primarily examined the effects of high temperatures on the mechanical, microstructural, and thermal properties of concrete when fly ash was replaced with 20% by weight of the cement, graphene oxide were added by 0.08% by the weight of the cement, and their combinations i.e. (20% FA + 0.08% GO) by the weight of the cement were tested at various temperatures 200, 400, 600, and 800 °C for 4 h. The ideal temperature decided by the mechanical characteristics is 200 °C, and to understand the microstructure of graphene oxide (GO) material is essential for understanding its performance, stability, and the principles underlying its behavior, particularly at elevated temperatures. Machine learning tools such as Response Surface Methodology (RSM) and Artificial Neuron Network (ANN) have been used to forecast the mechanical properties of concrete.

High-Temperature Corrosion Behavior of Superheater Materials at 600 °C: Insights from Laboratory and Field Exposures.

Combustion of biomass and waste results in release of corrosive species, such as alkali chlorides and water vapor, which accelerate the corrosion of superheaters in the boiler. To improve our understanding of alkali-induced corrosion, long-term corrosion investigations are needed. This study utilizes a systematic approach based on long-term corrosion studies (up to 8000 h) in a well-controlled laboratory environment to understand the corrosion behavior and protectiveness of oxide scales formed on a FeCr alloy (marginal chromia former) and three overlay weld coating systems (lean FeCrAl, FeCrAl, and Ni-based alloy) in a KCl-rich environment at 600 °C. The results show that all the alloys undergo fast breakaway corrosion and form duplex-layered scales consisting of outward- and inward-growing oxide scales. The marginal chromia former exhibits parabolic oxidation kinetics and forms Fe-rich oxides in the outer scale and mixed Fe- and Cr-oxides in the inner layer. These oxide microstructures are compared to the scales formed on probe-exposed samples in boilers, and similar microstructures are typically found after exposures. The FeCrAl coatings form Fe-rich oxides in the outer layer and Fe-, Cr-, and Al-oxides in the inner layer. All alloy systems except the Ni-based coating show corrosion rates in the boiler in good agreement with the laboratory test prediction. The Ni-based coating exhibits the slowest oxidation kinetics in the laboratory, forming thin oxide scales with Ni-rich oxides in the outer layer and Cr-rich oxides in the inner layers, while this is not the case in the waste-fired boiler.

Effect of Mo, Mn on the microstructure and mechanical properties of different oxides modified H13 steel by wire arc additive manufacturing

Effect of Mo, Mn on the microstructure and mechanical properties of different oxides modified H13 steel by wire arc additive manufacturing

Improvement of oxidation resistance of the Ti-modified Cr-based coating on Zry-4 by Cr2O3/Cr2TiO5 double oxide layer with coherent interface

The loss of coolant accident (LOCA) has brought great threat to the safety of nuclear power plant. The oxidation resistance of Zircaloy-4(Zry-4) cladding must be improved to prevent the leakage of nuclear fuel. The Ti-modified Cr-based coating with excellent oxidation resistance was deposited on the Zry-4 by magnetron sputtering. The oxidation kinetics and microstructure evolution of the coatings were investigated via isothermal oxidation experiments at 900–1200 °C, respectively. The results of oxidation kinetics shows that the oxidation resistance of the Ti-modified Cr-based coated Zry-4 is significantly improved and the activation energy of the coated Zry-4 is increased by about 25 %. After steam oxidation at 1200 °C, the coating formed a three-layer structure, Cr2TiO5, Cr2O3 and residual Cr layer. The first-principles calculation shows that the diffusion energy of O in Cr2TiO5 is higher than that in Cr2O3. Furthermore, the formed Cr2TiO5 layer is connected to the underlying Cr2O3 layer via a coherent interface, which both improves the bonding of the oxide layer and dissipates the stresses generated during the oxidation.

Insights from Microstructure and Recrystallization Comparisons of Wrought FeCrAl and Oxide Dispersion‐Strengthened Nanostructured Ferritic Alloy Tubes

Insights from Microstructure and Recrystallization Comparisons of Wrought FeCrAl and Oxide Dispersion‐Strengthened Nanostructured Ferritic Alloy Tubes

Pore formation and pore inter-connectivity in plasma electrolytic oxidation coatings on aluminium alloy

The porosity and microstructure of plasma electrolytic oxidation (PEO) coatings are key factors in determining their properties and applications. Despite advances in understanding the PEO process, the mechanisms driving pore formation and their correlation with process parameters remain unclear due to the complex interplay between these variables. This study investigates the effects of treatment time and duty cycle on the microstructure of PEO coatings produced on an aluminium alloy in an alkaline electrolyte, with a particular focus on pore formation. Our findings reveal that longer treatment durations lead to the significant development of sub-surface pores at the interface between the inner and outer layers. Additionally, a lower duty cycle leads to an increase in sub-surface pores, while a higher duty cycle favours the formation of surface pores. Morphological, 3D microstructural mapping, and chemical analyses reveal that pore formation is driven by the micro-discharges, gas generation, and the preferred gas escape path within the micro-melt pools formed during the PEO formation process. The preferred gas escape path is closely linked to the characteristics and lifetime of local micro-melt pools, elucidating the mechanisms behind pore formation.

Electrochemical Properties of Copper Oxides Obtained from Layered Copper Hydroxide Acetate for Nonenzymatic Glucose Sensing

Nowadays, glucose sensing is a crucial role for capturing the status of diabetes, and its precise sensing directly contributes to prevent such diseases from exacerbating. While the use of enzymes such as glucose oxidase is known to be a major stream in glucose sensing. the issues of cost. Reusability. and chemical stability are still room for development. One of the non-enzyme system, copper oxides, would be a game-changer in place of enzymes.1 In addition to some great features which can address the aforementioned issues, copper oxides have a unique characteristic of their microstructure.1 Because the microstructure (surface area) greatly dictates the sensing ability, several literatures report the correlation between sensing ability and the microstructure of copper oxides. 2,3 With this keep in mind, we prepared several copper oxides with different morphology by using a one-pot fabrication process based on electrochemistry and investigate the effect of various morphologies of copper oxides on the glucose performance (Fig. 1A). We prepared copper oxides by reducing a layered copper hydroxide acetate (Cu2(OH)3Ac-) with various voltages.4 First, Cu(CH3COO)2・H2O was added into ultra-purified water and was allowed in a thermostatic bath at 60 ℃ for 30 h to obtain Cu2(OH)3Ac-.4 The resultant Cu2(OH)3Ac- was mixed with water and was drop casted onto a carbon paper. The obtained carbon paper incorporated with Cu2(OH)3Ac- was immersed in 0.1 M KHCO3 electrolyte and was exposed at the constant voltage of -1.2 V vs. Ag/AgCl for one hour to obtain copper oxide. (Figure. 1(A)) Figure 1(B) shows the cyclic voltammograms of carbon paper electrodes in the absence or presence of copper oxides in the electrolyte of 0.1 M NaOH with 5 mM glucose. For the carbon paper electrode, there is no oxidation current appeared in the voltage range of 0-0.8 V vs. Ag/AgCl, suggesting that the carbon paper itself is inert for electrochemical reactions in such voltage range. On the flipside, a significant oxidation peak appeared when the carbon paper incorporated with copper oxides was used. More importantly, the peak current has a strong relationship with glucose concentration (Figure 1(C)), suggesting the glucose concentration is electrochemically detectable. We will demonstrate and discuss the influence of the applied potential during the fabrication of copper oxides on the glucose response in the poster session.AcknowledgementsThe work was supported partly by Nippon Sheet Glass Foundation for Materials Science Engineering.References1) Y. Zhanga, N. Li, Y. Xiang, D. Wang, P. Zhanga, Y. Wang, S. Lu, R. Xu, J. Zhao, Carbon, 156, 506-513, (2020).2)P. D. Luna, R. Quintero-Bermudez, C. Dinh, M. B. Ross, O. S. Bushuyev, P. Todorović, T. Regier, S. O. Kelley, P. Yang, E. H. Sargent, Nat. Catal., 1(2), 103–110, (2018).3) A. R. Amirsoleimani, H. Siampour, S. Abbasian, G. B. Rad, A. Moshaii, Z. Zaradshan, Sens. Bio-Sens. Res., 42, 100589, (2023).4) S. Švarcová, M. Klementová, P. Bezdička, W. Łasocha, M. Dušek, D. Hradil, Cryst. Res. Technol., 46(10), 1051-1057, (2011). Figure 1

Research on the oxidation behavior and oxidation mechanism of NiCrAl-bentonite abradable seal coatings at 650 °C

To study the oxidation behavior and microstructure transformation mechanism of NiCrAl-bentonite abradable seal coatings (ASCs), the NiCrAl-bentonite ASCs were prepared on GH4169 substrate with NiAl as the bonding layer, and the oxidation experiments were carried out at 650 °C at different time (24 h, 48 h, 72 h, 96 h, 144 h, 192 h). The evolution of surface, interior, and interface microstructure of the coating with different oxidation time was analyzed through X-ray diffractometer (XRD) and scanning electron microscope (SEM). The results indicated that the microstructure changes of the coating surface were as follows: the initiation of spot-like oxide → the growth of acicular oxide → the production of continuous oxidation film → the generation of NiO. The internal microstructure changes of the coating were as follows: the formation of Cr oxide layer → the formation of mixed oxide layer. The microstructure changes of the coating's interface were as follows: the initiation and growth thickening of the oxide layer. Element diffusion and oxygen partial pressure controlled the overall oxidation behavior of the coating. The formation of NiO and α-Al2O3 on the surface of coating after oxidation for 192 h at 650 °C had a bad effect on the service performance of the coating.

Plasma Electrolytic Oxidation Treatment on Magnesium Rare Earth Alloy: Effect of Low Current Density

The poor corrosion resistance of magnesium and its alloys can be overcome by developing appropriate surface treatments of these materials. The article explores the impact of using a current density of 15 mA cm−2, lower than those considered so far for the plasma electrolytic oxidation treatment of the WE43 earth rare‐based magnesium alloy, on process energy consumption as well as on microstructure and corrosion properties of oxide coatings grown on the magnesium alloy. Using a low current density during the treatment certainly means significant energy savings, but also good corrosion resistance compared to the untreated alloy, as demonstrated by electrochemical analyses and a through‐hole morphology of the oxide coating, which could be useful for all the applications in which beyond good corrosion resistance a specific surface area is essential.

Influence of micro-arc oxidation on the microstructure and dielectric properties of anodic aluminum oxide

To improve the dielectric performance of the anodic alumina film used in aluminum electrolytic capacitors, this study comparatively investigated the microstructure and dielectric properties of anodic aluminum oxide obtained through micro-arc oxidation (MAO) and conventional anodic oxidation (CAO). It is found that from the perspective of microstructure, the internal structure of the MAO treated oxide film has more and larger pores than that of CAO. This was attributed to the generation and overflow of numerous oxygen bubbles from within the oxide film at the locations where plasma sparks occurred during the process, thus forming larger pores. Regarding dielectric properties, the leakage current of the oxide film after MAO treatment was significantly reduced compared to CAO, with reductions of 58%, 56%, 64%, and 74% for the tested electrolytes Y1–Y4, respectively.

Is Low Polydispersity Always Beneficial? Exploring the Impact of Size Polydispersity on the Microstructure and Rheological Properties of Graphene Oxide.

Graphene oxide (GO) is a promising material widely utilized in advanced materials engineering, such as in the development of soft robotics, sensors, and flexible devices. Considering that GOs are often processed using solution-based methods, a comprehensive understanding of the fundamental characteristics of GO in dispersion states becomes crucial given their significant influence on the ultimate properties of the device. GOs inherently exhibit polydispersity in solution, which plays a critical role in determining the mechanical behavior and flowability. However, research in the domain of 2D colloids concerning the effects of GO's polydispersity on its rheological properties and microstructure is relatively scant. Consequently, gaining a comprehensive understanding of how GO's polydispersity affects these critical aspects remains a pressing concern. In this study, we aim to investigate the dispersions and structure of GOs and clarify the effect of polydispersity on the rheological properties and yielding behavior. Using a rheometer, polarized optical microscopy, and small-angle X-ray scattering, we found that higher polydispersity in the same average size leads to overall improved rheological properties and higher flowability during yielding. Thus, our study can be beneficial in the employment of polydispersity in the processing of GO such as 3D printing and fiber spinning.

Oxidation behaviour of Ti-V-Cr-Nb-Ta and Al-Ti-V-Cr-Ta refractory high entropy alloys: Effects of Nb and Al substitutions

Refractory high entropy alloys (RHEAs) are candidate materials for nuclear and other high-temperature applications, due to their high-temperature strength, good irradiation resistance, and high melting temperatures. However, a significant issue with current RHEAs is that those exhibiting good mechanical properties tend to show poor oxidation resistance, and vice versa. In this paper, the oxidation kinetics of four RHEAs (20Ti-20V-20Cr-20Nb-20Ta, 25Ti-25V-5Cr-20Nb-25Ta, 20Al-20Ti-20V-20Cr-20Ta, and 14Al-24Ti-24V-14Cr-24Ta alloys) were investigated in an air atmosphere at 1000 °C. As-prepared and oxidised samples were characterised by a combination of state-of-the-art microscopy techniques. By replacing Nb with Al, the two Al-containing alloys were observed to form a less porous oxide microstructure, showing significant improvement in their oxidation resistance. As a result of oxygen/nitrogen ingress during oxidation and associated phase-segregation at high temperatures, the hardness of the underlying metal matrix of the RHEAs increased by approximately 5 GPa.

Microstructure characterization of plasma electrolytic oxidation coating on Hf-Nb-Ta-Zr high entropy alloy

The morphology, composition, and microstructure of plasma electrolytic oxidation (PEO) coating on Hf-Nb-Ta-Zr high entropy alloy (HEA) were characterized by scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), Raman spectroscopy, glow discharge optical emission spectroscopy (GDOES) and transmission electron microscopy (TEM). The formation mechanism of PEO coating was analyzed. It was found that a dense PEO coating of ∼4 μm thick on the HEA surface was formed, which consisted of tetragonal and monoclinic ZrO2 phases, tetragonal and monoclinic HfO2 phases, Nb2O5 and Ta2O5 phases. The PEO coating from the alloy substrate to the surface contained five distinctive layers: amorphous barrier layer, nanocrystalline layer, columnar grain layer, amorphous outer layer, and top porous layer. Their formation was ascribed to the different cooling rates of the melt in the different depths of the discharge channel across the coating. Meanwhile, the formation of an amorphous barrier layer near the HEA substrate was also related to the mutual migration and diffusion of Hf4+, Nb5+, Ta5+, Zr4+ and O2− besides the rapid cooling of melt in the bottom of the discharge channel. The columnar grains of ∼70 nm wide were mainly composed of the monoclinic ZrO2 and monoclinic HfO2 phases, but both the amorphous layers enrich the Ta and Nb elements. It was believed that the high-content Ta and Nb in the HEA enhanced the formation of the amorphous layers.

The effect of heating rate on microstructure and electrochemical performance of nickel-rich layered oxides cathode materials

Nickel-rich layered oxides have attracted significant attention as promising cathode materials for lithium-ion batteries due to their high specific capacity, rate capability, and relatively low cost. However, the material still faces challenges such as harsh synthesis conditions, easy cation mixing and large residual alkali on the surface, severely limiting its practical applications. To overcome these drawbacks, this study successfully synthesized a series of LiNi0.8Co0.1Mn0.1O2 (NCM) cathode materials with different heating rates. The results indicate that appropriately reducing the heating rate can improve the cycling performance of the material and reduce cation mixing and surface residual alkalinity. Specifically, among the four samples, the LiNi0.8Co0.1Mn0.1O2 sample (NCM-2 °C min-1) exhibites a lower Li⁺/Ni²⁺ mixed arrangement and fewer surface residual alkalis, demonstrating good cycling performance and rate capability. The NCM-2 °C min-1 sample provides an excellent initial discharge capacity of 210.4 mAh g⁻¹ under 0.1 C conditions, and it achieves the highest capacity retention rate (85.9%) after 100 cycles at 1 C, while the capacity retention rates for NCM-1 °C min-1, NCM-3 °C min-1, and NCM-4 °C min-1 are 75.4%, 75.2%, and 71.2%, respectively. NCM-2 °C min-1 sample also showed excellent rate performance, especially at high rates. The discharge capacity remains at 151.6 mAh g-1 at 10 C, which is much higher than that of other samples (149.3 mAh g-1 for NCM-1 °C min-1, 123.5 mAh g-1 for NCM-3 °C min-1, and 120.6 mAh g-1 for NCM-4 °C min-1). The research of synthesis technology has important guiding significance for the synthesis of high-stability high-nickel layered oxide materials.

Well‐defined synthesis of crystalline MnO, Mn2O3, and Mn3O4 phases by anodic electrodeposition and calcination

AbstractTailoring of the stoichiometry, crystallinity, and microstructure of manganese oxides (MnOx) is of utmost importance for technological applications in the field of catalysis, energy storage, and water splitting. In this work, α‐Mn2O3, α‐Mn3O4, and MnO thin films with defined stoichiometric compositions and crystal structures were prepared by calcination of an anodically electrodeposited Mn‐oxyhydroxide precursor film in different gas atmospheres (air, inert, or reducing gas). The crystal structure and composition of the precursor and product films were determined by combining X‐ray diffraction, transmission electron microscopy, Raman spectroscopy, Rutherford backscattering spectrometry, and elastic recoil detection analysis. The anodically electrodeposited precursor film consists of nanocrystals of α‐Mn3O4 dispersed in an amorphous MnOOH matrix phase, and can be fully transformed into either crystalline α‐Mn2O3, α‐Mn3O4, or MnO upon calcination in an oxidizing, inert or reducing atmosphere, respectively. In situ high‐temperature X‐ray diffraction was applied to derive the phase transformation kinetics, resulting in a corresponding activation energy which decreases in the order α‐Mn2O3 (268 kJ/mole) > MnO (102 kJ/mole) > α‐Mn3O4 (60 kJ/mole). The disclosed synthesis routes for the preparation of single‐phase MnOx films with a defined crystal structure and stoichiometry can be exploited for a wealth of applications.

(Invited) IrOx Nanoparticle Catalysts on a Unique Microstructure of Doped Tin Oxide to Dramatically Boost the Oxygen Evolution Reaction Activity for PEM Water Electrolysis

Proton exchange membrane water electrolyzers (PEM WEs) has a potential to produce high-purity green hydrogen. PEMWEs have been commercialized with the use of high loadings of the noble metal Ir-based anode catalyst for the oxygen evolution reaction (OER). To lower the Ir loading amount, it is critically important to develop efficient catalysts with increased Ir utilization and higher OER activity. One-dimensional Ir oxide nanorod/nanoparticles catalysts supported on doped SnO2 with a unique microstructure were invented to show their exceptionally high activity in the OER catalysis, with the Ir-mass specific activity being 10 times higher than that of commercial IrOx catalyst at 1.5 V vs. RHE.[1] The experiment also found that the OER activation energy was greatly lower than that of commercial Ir oxide. The interaction between Ir oxide nanorod/nanoparticles and doped SnO2 support occurs a lower degree of Ir oxidation which allows the surface terminal oxygens to be closer together while allowing facile desorption of nonreactive oxygenated species. The electronic state of Ir oxide nanorod/nanoparticles catalysts could play an important role in facilitating the crucial step of the OER, thereby enhancing the OER activity. These priorities of the catalysts would promise the reduction of the Ir usage in PEMWEs.Reference[1] G. Shi, T. Tano, D.A. Tryk, T. Uchiyama, A. Iiyama, M. Uchida, K. Terao, M. Yamaguchi, K. Tamoto, Y. Uchimoto and K. Kakinuma, ACS Catalysis, 13 (2023) 12299. Figure 1

Graphene Oxide Surface Modification of Reverse Osmosis (RO) Membrane via Langmuir-Blodgett Technique: Balancing Performance and Antifouling Properties.

The reverse osmosis water treatment process is prone to fouling issues, prompting the exploration of various membrane modification techniques to address this challenge. The primary objective of this study was to develop a precise method for modifying the surface of reverse osmosis membranes to enhance their antifouling properties. The Langmuir-Blodgett technique was employed to transfer aminated graphene oxide films assembled at the air-liquid interface, under specific surface pressure conditions, to the polyamide surface with pre-activated carboxylic groups. The microstructure and distribution of graphene oxide along the modified membrane were characterized using SEM, AFM, and Raman mapping techniques. Modification carried out at the optimal surface pressure value improved the membrane hydrophilicity and reduced the surface roughness, thereby enhancing the antifouling properties against colloidal fouling. The flux recovery ratio after modification increased from 65% to 87%, maintaining high permeability. The modified membranes exhibited superior performance compared to the unmodified membranes during long-term fouling tests. This membrane modification technique can be easily scaled using the roll-to-roll approach and requires minimal consumption of the modifier used.

Oxidation mechanism and microstructure evolution of invar alloy with high temperature annealing process

The high temperature oxidation behavior of Fe–36Ni Invar alloy in the forged billet stage and hot rolled rod stage in the compressed air atmosphere has been systematically studied. The results show that the oxide layer can be divided into the external oxide layer composed of Fe2O3, Fe3O4 and NiO, and the inner transition oxide layer composed of FeO, Fe2O3, Fe3O4 and NiO. In addition, hot rolled rod samples treated by solution and rolling have higher oxidation resistance. The mechanism of O diffusion during oxidation is analyzed, and it is found that the O atom adsorbed on the surface of the substrate diffuses into the grain along the grain boundary. The grain boundary is the optimal path for O diffusion to the interior of the material, which results in the degree of intergranular oxidation of the alloy being greater than the degree of intragranular oxidation. In summary, the oxidation resistance of Invar alloy can be improved by proper solution treatment and avoiding the formation of grain boundary cracks during production.

Microstructure, mechanical properties and interfacial features of graphene oxide reinforced 7075 composites fabricated by ultrasonic assisted casting

Graphene oxide reinforced 7075 (GO/7075) composites were successfully prepared via ultrasonic assisted casting. In this study, the microstructure, mechanical properties and interfacial structure of GO/7075 composites with varying GO contents were investigated. The experimental results showed that GO could refine grain size and produce many dislocations at the GO/Al interface, and was well bonded with Al matrix. Meanwhile, a few rod-like Al4C3 phases were observed at the active prism planes of GO in the composite. When the content of GO reached 1.0 wt%, the optimal mechanical properties of GO/7075 composites were obtained. The yield strength and ultimate tensile strength of 1.0 wt% GO/7075 composites were 212.3 MPa and 285.6 MPa, which were 61.8 % and 41.1 % higher than those of 7075 alloy, respectively. The thermal mismatch strengthening and load transfer strengthening were the main strengthening mechanisms. Moreover, in order to control the interfacial reaction between GO and Al matrix, the thermodynamic/kinetic condition and growth mechanism for the formation of Al4C3 were analyzed in details.