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Quick Search     Adv Search   2024 Vol. 31, No. 1 Published: 2024-02-20   0 The working principle and key materials of Mg ion batteries Magnesium ion batteries have been widely studied in recent years due to their advantages of abundant raw materials, low cost, environmental friendliness and high volumetric specific capacity. However, its development and practical application are limited by the slow diffusion kinetics of Mg2+, the formation of passivation layer on the surface of magnesium metal anode during cycling, and the sensitivity of electrolyte to air, strong corrosion and low voltage window. It is very important to explore suitable electrode materials and electrolytes with good compatibility. Herein, the working principle of magnesium ion batteries is described briefly. The research status of cathode and anode materials as well as electrolytes are summarized, and the existing problems and corresponding solutions are discussed elaborately in order to promote the further development of magnesium ion batteries. 2024 Vol. 31 (1): 0-0 [Abstract] ( 0 ) HTML (1 KB)  PDF  (0 KB)  ( 0 ) 0 Preparation and Mechanical Properties of Titanium Matrix Composite Materials by Spark Plasma Sintering This article uses discharge plasma sintering method to prepare (TiC+TiB)/TC4 composite materials. Firstly, the ball milling process was optimized, and the effect of sintering temperature on the phase composition, microstructure, and mechanical properties of titanium based composite materials was studied. The results indicate that the optimal ball milling parameter is 200r/min ball milling for 8 hours, which can adhere the reinforcing phase to the surface of the matrix powder without damaging the morphology of the particles. 5vol.% was prepared by in-situ synthesis using SPS at temperatures ranging from 1000 to 1150 ℃ (TiC+TiB)/TC4 composite material, TiCp and TiBw exhibit a quasi continuous network structure distributed at grain boundaries. As the SPS temperature increases, the strength and engineering strain of the composite material first increase and then decrease, reaching a maximum of 1722MPa and 28.31% at 1100 ℃, thus determining the optimal SPS temperature. 2024 Vol. 31 (1): 0-0 [Abstract] ( 0 ) HTML (1 KB)  PDF  (0 KB)  ( 0 ) 0 Study on the Influence of Carbon Content on the Hydrogen Resistance of Steel Based on First-Principles and Machine Learning The hydrogen embrittlement issue in ferrite steels has always been a hot topic of concern for researchers, particularly the unclear influence of different carbon contents on the hydrogen resistance of iron and steel materials. In this study, a high-precision machine learning force field (MLFF) for the iron-carbon-hydrogen system was constructed by combining first-principles calculations with machine learning algorithms. Molecular dynamics simulations were performed to investigate the diffusion behavior of hydrogen atoms in steels with different carbon contents. The high-precision MLFF was trained using a neural network (NN) model based on first-principles molecular dynamics (AIMD) results of multiple configurations. Various tests were conducted to ensure that the machine learning force field could accurately describe the statistical and dynamic properties of the iron-carbon-hydrogen system. Using this MLFF, molecular dynamics simulations were performed on ferrite steels with different carbon contents, and the hydrogen diffusion coefficients were calculated. It was found that the hydrogen diffusion coefficient generally decreased with increasing carbon content, in good agreement with experimental results. The algorithm model established in this study can analyze the influence of carbon content on the hydrogen resistance of iron and steel materials, which is of significant importance for studying hydrogen-induced damage in steel materials and composition design. 2024 Vol. 31 (1): 0-0 [Abstract] ( 0 ) HTML (1 KB)  PDF  (0 KB)  ( 0 ) 0 Effect of heat treatment on microstructure and mechanical properties of 40CrNiMo steel Abstract: The effects of different quenching temperatures on the tempering structure and mechanical properties of 40CrNiMo steel were studied by OM, SEM, EBSD and Vickers hardness tester, combined with low temperature impact test. The results show that: When the quenching temperature is 700 and 740 ℃, the tempering structure of 40CrNiMo steel is ferrite and tempered sorbitite, and the tempering hardness difference is not large, respectively, 196.2HV and 194.0HV, as the quenching temperature continues to rise to 850 ℃, the tempering structure is tempered sorbitite. The hardness of the test steel reached the maximum 235.7HV; When the tempering temperature is 630 ℃, different quenching temperatures have little effect on the impact performance of 40CrNiMo steel, and the impact energy at -20 ℃ is basically maintained at 26-30 J. When the quenching temperature is 850 ℃, due to the lack of ferrite, the impact work decreases slightly to 26.3 J, and the comprehensive mechanical properties are better at this time. 2024 Vol. 31 (1): 0-0 [Abstract] ( 0 ) HTML (1 KB)  PDF  (0 KB)  ( 0 ) 0 Preparation and Performance Study of Carbon Materials and Cobalt Aluminum Hydroxide Composite Materials In order to solve environmental requirements such as energy shortage, supercapacitors have gradually emerged in people's vision due to their advantages of fast charging and discharging and excellent energy storage performance. Among them, electrode material is a key factor affecting the performance and cost of supercapacitors. Due to its unique performance, carbon materials were the first batch of materials used in supercapacitors. Therefore, on the basis of functionalization of carbon nanotubes, this work studied the addition of carbon quantum dots and functionalized carbon nanotubes to cobalt aluminum bimetallic hydroxides, and the synthesis of CQDs/CoAl LDH and FMWCNTs/CoAl LDH binary composites increased the specific surface area of bimetallic hydroxides, made the structure more stable, and improved the conductivity, specific capacitance, and electrochemical cycle stability. 2024 Vol. 31 (1): 0-0 [Abstract] ( 0 ) HTML (1 KB)  PDF  (0 KB)  ( 0 ) 0 Effect of V and Co addition on microstructure and properties of Fe-36Ni invar alloy Adding alloying elements to enhance the mechanical properties of invar alloy usually results in a substantial increase in the expansion coefficient of it. Based on the precipitation strengthening mechanism of VC and the theory of Co element inhibition of thermal expansion of invar alloy, this study explored the effects of different C , V additions on the microstructure, physical properties and thermal expansion of Fe-36Ni invar alloy. OM, EBSD, TEM, tensile electronic universal tensile testing machine, thermal expansion tester and other methods were used to characterize and test the microstructure of alloy.The results show that the grain size of the alloy gradually decreases, and the hardness of the microstructure increases with the increase of C and V addition, the yield strength and tensile strength reached 295Mpa and 588Mpa respectively in a medium temperature environment of 200℃, which is significantly improved compared with the original Invar alloy. The coefficient of thermal expansion α20-220 °C = 3.3686×10-6/°C remained at a low level, which was mainly attributed to the addition of appropriate Co elements. Solution strengthening, fine grain strengthening and second phase precipitation strengthening are the main reasons for the improvement of mechanical properties of the invar alloy. This study has certain reference significance for the optimization of alloy composition and improvement of comprehensive properties of new invar alloy. 2024 Vol. 31 (1): 0-0 [Abstract] ( 0 ) HTML (1 KB)  PDF  (0 KB)  ( 0 ) 0 Effect of aging time on microstructures and properties of TC4 titanium alloy prepared by laser powder bed fusion 2024 Vol. 31 (1): 0-0 [Abstract] ( 0 ) HTML (1 KB)  PDF  (0 KB)  ( 0 ) 0 Current situation of study on residual stress of materials additive manufacturing The accumulated residual stress in the process of metal additive manufacturing (MAM) has a significant impact on the dimensional stability, corrosion resistance, crack growth resistance and mechanical properties of MAM specimens. This paper mainly reviews the latest research results on the formation mechanism, influencing factors, test characterization, simulation and active regulation of residual stress in MAM components. Based on the current status of relevant technologies, the problems and difficulties of various residual stress testing, simulation, regulation and other technologies are summarized, and the future development trend is prospeced, so as to provide the latest information and knowledge about the MAM residual stress for researchers, in order to provide some practical enlightenment for the development of a systematic residual stress control technology. 2024 Vol. 31 (1): 0-0 [Abstract] ( 0 ) HTML (1 KB)  PDF  (0 KB)  ( 0 ) 0 Research and practice on cooling process of DP600 by horizontal furnace hot dip galvanizing line Abstract: In this paper, through thermal simulation experiments, the dynamic CCT curve is drawn, the cooling rate, phase transformation time requirement and phase transformation temperature range of DP600 in production are defined. According to the dynamic CCT curve, combined with the heating, cooling and post-coating cooling capacity of the horizontal annealing furnace in the hot dip galvanizing line, the DP600 dual phase steel is successfully developed through the results verification of thermal simulation experiment. 2024 Vol. 31 (1): 0-0 [Abstract] ( 0 ) HTML (1 KB)  PDF  (0 KB)  ( 0 ) 0 Study on the Effect of Temperature on the Aging of Lead-acid Battery Plates Made of Different Materials Lead acid batteries are the most common power source in the DC system of substations. In the event of AC power loss in the station, they can provide timely power to DC loads such as protection and measurement. However, valve regulated lead-acid batteries are prone to plate aging after prolonged operation. Study the effect of temperature changes on the aging defects of electrode plates. Considering the influence of temperature rise conditions, three different types of battery samples were prepared, and cyclic accelerated aging tests were conducted using lead calcium grid, lead antimony grid, and lead selenium low grid. The aging status of each group of samples under temperature rise conditions was tested. After experimental verification, it can be concluded that the total capacity of lead-antimony grid and lead-selenium low grid batteries is significantly lower than that of lead-calcium grid batteries when subjected to accelerated aging tests in high temperature environments (63 ℃), indicating that these two groups of samples are prone to capacity loss under high temperature conditions. Similarly, under the high temperature conditions, the internal resistance and current of these two groups of samples were significantly higher than those of lead-calcium grid batteries, indicating their poor performance in high temperature environments. High internal resistance can lead to increased energy loss during battery charging and discharging, and high current may affect the stability and lifespan of the battery. In addition, according to the test results under different temperature conditions (25 ℃, 35 ℃, and 45 ℃), the discharge time of the three sets of samples gradually accelerated, while the battery capacity gradually decreased. This indicates that the high-temperature environment will accelerate the aging process of the battery and lead to the loss of battery capacity. Among the three sets of batteries, the battery plates using lead-calcium grids have a relatively long service life and the slowest aging rate in high-temperature environments.. 2024 Vol. 31 (1): 0-0 [Abstract] ( 0 ) HTML (1 KB)  PDF  (0 KB)  ( 0 ) 0 Determination of aluminium, manganese and zinc in Lanthanum hydroxide by Inductively coupled plasma mass spectrometry Abstract: Accurate determination of aluminium, manganese and zinc in Lanthanum hydroxide is great significance for production and application.The samples were dissolved in nitric acid, 27Al, 55Mn and 64Zn were selected as isotopes, and the matrix effect was corrected by rhodium internal standard in 1% (V/V) nitric acid medium.A method for the determination of aluminium, manganese and zinc in Lanthanum hydroxide by Inductively coupled plasma mass spectrometry (ICP-MS) was developed.The effects of matrix concentration and internal standard elements on the determination were investigated. The results show that the matrix effect is not significant in the range of the mass concentration of the matrix. The calibration effect of Rh internal standard is better than that of cesium and indium internal standard.Rhodium (10.00 ng/mL) was selected as internal standard, and the concentration of lanthanum was controlled to 0.37 mg/mL. The experimental results show that the correlation coefficient of calibration curve is above 0.9995, the detection limit is 0.069 ppm~0.24 ppm, and the quantitative limit is 0.23 ppm~0.78 ppm.The relative standard deviation (RSD,n=11) was 1.22%~2.72% , and the recoveries were 90%~101%. 2024 Vol. 31 (1): 0-0 [Abstract] ( 0 ) HTML (1 KB)  PDF  (0 KB)  ( 0 ) 0 Study on vacuum brazing of Ti65 high temperature titanium alloy with titanium based amorphous brazing filler In order to achieve high-quality brazing connection of high-temperature titanium alloy Ti65, three components of Ti-based amorphous brazing filler with Zr as the variable were prepared using vacuum rapid quenching technology, and Ti65 was brazed according to the optimal welding process of the three brazing filler. The microstructure and element distribution characteristics of three types of brazing joints were analyzed using scanning electron microscopy, and the tensile properties of the joints at room temperature and 650 ℃ were compared and analyzed. The experimental results show that the three types of brazing filler have good surface quality and no pores， and can achieve Ti65 brazing connection. The joint is mainly composed of layered Widmannstatten structure, but there is a continuous compound phase in Ti-13Zr-Cu-Ni brazing filler. The mechanical performance results show that the room temperature and 650 ℃ high temperature tensile properties of the three brazing filler can reach over 90% of the tensile strength of the base material. The room temperature tensile strength of Ti-13Zr -Cu-Ni brazing material is slightly lower, and the fracture mainly occurs at the joint interface, exhibiting brittle fracture. The fracture of the Ti-Cu-Ni brazing material room temperature and 650 ℃ high temperature tensile sample occurs at the base material, showing mechanical properties equivalent to the matrix. 2024 Vol. 31 (1): 0-0 [Abstract] ( 0 ) HTML (1 KB)  PDF  (0 KB)  ( 0 )

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