bluuebunny/crossref_metadata_2025_split huggingface dataset:
Analysis of thermal stability and enthalpy in SSD systems with various thickening agents
Authors: Duan Rui , Wang Jinning , Zhang Ao 
Published: September 2024

Abstract
Phase change materials (PCMs) play a vital role in the improvement of efficiency of cold storage air conditioning for demand side management of electrical power. To enhance the thermal stability and the enthalpy of the system, the separation of Sodium Sulfate Decahydrate (SSD) hydrate crystals from their aqueous solution is a significant factor that needs to be addressed. The melt blending technique has been used to explore the effect of various thickening agents, namely Carboxymethyl Cellulose (CMC), Xanthan Gum (XG), and Sodium Alginate (SA) on the thermal stability and enthalpy of the system. The choice of the best thickening agent and its optimum concentration led to the enhancement in the thermal stability and enthalpy of the system. Experimentally, among the three thickeners, CMC proved to be the best thickening agent that remarkably improved the thermal physical properties of the SSD formulation. The paper described the detailed experimental procedures, including melt blending set-up, thermal characterization unit, and cyclic stability test unit. The experimental results showed that the formulation, SSD-CMC at 2 wt% CMC and 50% SSD significant, improved in their thermal physical performance, wherein the enthalpy decreased from 104.23 kJ/kg to 83.71 kJ/kg over fifty cycles, which are the 19.69% of the decay for such a long cycling. It was then concluded that the results would improve the effectiveness of thermal energy storage materials and that phase change materials should be optimized to be used in sustainable and efficient cooling applications and useful for the improvement of the storage capacity of thermal energy storage solutions.
Experimental and simulation study on mechanical properties of ZK60 magnesium alloy after accumulative roll bonding
Authors: Li Shaojie , Jin Jianfeng , Wang Yongbo , Pan Hucheng , Qin Gaowu 
Published: September 2024

Abstract
The mechanical properties of two- and four-layered wrought ZK60 Mg alloy sheets after two passes of accumulative roll bonding (ARB) with different reduction were studied and the microstructure were analyzed. The four-layered ZK60 sheets after ARB with 50% reduction demonstrate better strength-ductility combinations with yield strength of 223 MPa, ultimate tensile strength of 327 MPa, and total elongation of 23.7%, compared with the initial ZK60 of 222 MPa, 291 MPa and 10.0%, respectively. The average grain size of four-layered ARB ZK60 sheet is reduced from 21.8 μm of the initial sample to 4.4 μm. Using a micromechanical finite element model, the strain hardening behavior of ZK60 sheet was successfully predicted. The predictions were in good agreement with the experimental results. The simulation results reveals that the high performance of ZK60 sheets may be contributed by the lamella structure formed by the fine and coarse grains, which can avoid the local stress concentration and inhibit initiation and propagation of the microcracks. These findings provide a theoretical basis for the structural optimization design of ZK60 Mg alloys.
Prediction of flow stresses for a typical Nickel-Based superalloy during hot deformation based on constitutive equation
Authors: Liu Jianxiao , Jiang Chao , Zhai Yuewen , Zhou Leyu , Zong Haiyu , Wang Huizhen , Zhan Yuheng 
Published: September 2024

Abstract
Utilizing the Gleeble-3500 thermal simulation testing machine, a series of isothermal constant strain rate thermal compression tests were executed to study the high-temperature rheological properties of the GH4169 alloy. These tests were carried out under deformation temperatures between 900°C and 1100°C, with strain rates from 0.001 to 1 s−1, and involved a deformation of 60%. The results reveal that the peak stress of the GH4169 alloy decreases as the temperature increases, and the strain rate decreases during hot deformation. The activation energy for thermal deformation is calculated to be 806.39 kJ/mol. Through regression analysis and polynomial fitting of true stress-strain curves from thermal compression tests, an Arrhenius constitutive equation integrating strain compensation for high-temperature deformation was established. The model exhibits an average relative error of 8.86% between predicted and experimental values, indicating the model’s good accuracy in predicting the alloy’s rheological behavior during thermal deformation. By adjusting the strain rate and deformation temperature, this model can be utilized to control the stress level in the hot working process.
The impact of induction heating time on the temperature distribution of high-temperature alloy discs
Authors: Tuermengke  , Zhu Weidong , Zhai Yuewen 
Published: September 2024

Abstract
The induction heating time is directly related to the temperature uniformity of high-temperature alloy disc components. Therefore, investigating the influence of induction heating time on the temperature field distribution of disc components provides guidance for temperature control strategies in the forming process. In this study, the finite element analysis software COMSOL Multiphysics was employed to examine the impact of induction heating time on the radial and thickness-wise temperature fields of GH4169 discs. The results indicate that the heating time affects the thickness of the heating layer, and appropriately extending the heating time can improve the temperature uniformity in the thickness direction, achieving a temperature difference of ±5 °C in the disc component thickness direction under certain conditions. When the heating time ranges from 1229 s to 1239 s, the temperature in the R=30 mm to R=100 mm range reaches the suitable forging temperature.
The influence of heat treatment on AlSi-polymer abradable coating
Authors: Liu Caiyan , Mao Zhengping , Xu Xiaojie 
Published: September 2024

Abstract
Abradable coatings, as one of the most important technologies for aero and industry gas turbine engines, have an extremely significant influence on engine performance. The macro-hardness of AlSi-Polyester for low-pressure compressor and as-sprayed coating degradation mechanism has been investigated by heat treatment process in imitation service condition. SEM (Scanning Electron Microscope) and OM (Optical Microscope) were used to observe the morphology of powder and coating microstructure in cross-section, respectively. Rockwell hardness tester was used to measure the macrohardness of coatings before and after heat treatment. It shows that AlSi-Polyester powder has an approximately spherical shape and uniform microstructure with alloy phase and polyester phase distribution in the coating prepared by air plasma spraying. Oxidation of the alloy phase and reduced polyester, as well as macrohardness in the as-sprayed coating, occur after the heat treatment process.
Fast determination of thermal conductivity of aluminum alloy by laser-induced breakdown spectroscopy
Authors: Shan Yuheng , Liu Ruibin 
Published: September 2024

Abstract
The matrix thermal properties are closely linked to laser-induced plasma, because it is the heat effect predominantly governs the process when the nanosecond-pulsed laser acting on the material, particularly in metallic materials. In the study using a series of pure metal samples, We detected a substantial inverse linear relationship linking the matrix’s thermal storage coefficient of the material to the temperature of the plasma. This discovery reveals that metals exhibiting reduced thermal conductivity or lower specific heat capacity necessitate a smaller amount of laser energy to achieve thermal spreading and to facilitate the transitions to the melted and vaporized states, which consequently results in a higher rate of material removal and higher plasma temperatures. Based on this correlation, a prediction model for the thermal conductivity of aluminum alloys has been developed, employing LIBS technique as analysis method, alongside PLS regression, with a relative error of below 1.5%. It presents a pioneering technique for the swift evaluation of thermal conductivity in aluminum alloys.
Determination of stress triaxiality by experiment-simulation and obtaining of johnson-cook damage criterion for Al-Mn alloy
Authors: Wang Wei , Hu Yongbo , Zhang Dashuai , Chi Dao , Wang Guobin 
Published: September 2024

Abstract
Al-Mn alloy is extensively implemented in new energy vehicles. Damage prediction is the key to its safety application. The Johnson-Cook (JC) constitutive relationship parameters of Al-Mn alloy were first determined by standard tensile tests to predict the damage behavior of Al-Mn alloy. Subsequently, different notch specimens were designed to study the influence of stress state on damage behavior. By combining tensile tests and simulations, the stress triaxiality of Al-Mn alloy under different stress states was accurately obtained. On this basis, the JC damage criterion parameters were obtained. Finally, the obtained JC constitutive relationship and damage criterion parameters were imported into the tensile simulation models. The results showed that the force-displacement curves of the tensile experiments and simulations matched well, which can effectively simulate the deformation and fracture behavior of the Al-Mn alloy.
Influence of heat treatment process on the microstructure and hardness of Q345B steel
Authors: Wang Yan 
Published: September 2024

Abstract
This paper studied and determined the heat treatment processing technology of Q345B steel, and analyzed its metallographic structure and hardness after different quenching and tempering methods. The results showed that the salt quenching cooling rate was the fastest, resulting in the most martensite and the highest hardness. The hardness of salt-quenched, water-quenched, and oil-quenched steel decreased sequentially, but all of them are significantly higher than the initial hardness of Q345B steel. 950°C was more suitable for quenching Q345B steel than 900°C, with better microstructure and hardness. After quenching, tempering is conducted, and under the same quenching process, three different types of tempering are conducted. The hardness of low-temperature tempering, medium-temperature tempering, and high-temperature tempering decreased sequentially, but they were not lower than the initial hardness of Q345B steel.
Synthesis and thermophysical properties of rare-earth tantalate ZrO2-Dy3TaO7 ceramics
Authors: Li Dongbo , Zhang Ming , Deng Ge , Yang Yuan , Gui Rong , Yang Guizhong 
Published: September 2024

Abstract
Thermal Barrier Coatings (TBCs) are of major concern to researchers because of their outstanding properties, such as high-temperature resistance, compressive resistance, hardness, and toughness. Its applications are wide-ranging and critical. Examples include hypersonic vehicles, aero-engines, and service in high-temperature and high-impact extreme environments. This work focuses on the preparation, thermal properties (coefficient of thermal expansion, thermal conductivity), and performance evaluation (thermal shock resistance, thermal shock resistance, and bonding) of ZrO2-Dy3TaO7 rare earth tantalate ceramic coating materials. The results show that ZrO2-Dy3TaO7 possesses a low thermal conductivity (1.25-1.50 W K−1 m−1, 900°C), a high thermal expansion coefficient (10.80-11.14×10-6 K−1, 1200°C), which is about half of the value of the thermal conductivity of 7YSZ (2.8-2.2 W K−1m−1). It is better than that of the 7YSZ (10.04×10−6 K−1, 1200°C), which meets the performance requirements of the new thermal barrier coating. In addition, ZrO2-Dy3TaO7 can achieve more than 6, 000 thermal fatigue cycles at 1200°C, and the ideal number of thermal shock cycles is 4, 040 cycles at the same temperature. These outstanding test results demonstrate that the ceramic coating can effectively protect the substrate material and provide long-term service in high-temperature copper liquid. This research lays the theoretical foundation for the development of next-generation coating materials, particularly for thermal barrier/environmental barrier integrated coating materials.
The enhanced aging hardening behavior in Si-containing Al-5Zn-1Mg-1Cu alloys
Authors: Lu Yi , Wen Shengping , Nie Zuoren 
Published: September 2024

Abstract
The ageing behaviour and phase transformation of a range of Si-microalloyed low Mg/Zn ratio Al-5.0Zn-1.0Mg-Cu alloys were investigated at a temperature of 150°C by using TEM and microhardness tests. Adding Si had a important influence on the proportion of precipitates and microhardness. As Si content increased, the precipitated phase underwent a gradual transition from the T+η precipitates to the fine GPB-II precipitates. Concurrently, the microhardness exhibited a notable enhancement from 120 HV to 150 HV when the alloys were subjected to 150°C aging. Existence of small and even GPB-II phases in the Si-adding alloy was identified as underlying cause of this result. This GPB-II phase exhibited a bilayer microstructure. In core region predominantly comprise Zn, Si and Mg, and the shell region primarily consist of Zn and Cu. This structure effectively inhibited phase growth, maintaining the phases at a smaller scale and enhancing the alloy’s hardening effect.
Research on the influence of finish rolling technique parameters on H2S corrosion resistance behavior of pipeline steel in the thickness direction
Authors: Fan Yanqiu , Ma Changwen , Li Shaopo , Ding Wenhua , Wang Longhe , Liu Yang , Li Zhanjun 
Published: September 2024

Abstract
Natural gas was an important energy for human society’s development, and there was still a great demand for this type of energy. It required pipeline steel for energy transport and had excellent hydrogen-induced cracking resistance. Thermomechanical controlled processing (TMCP) was a frequently used manufacturing method for pipeline steel. It was necessary to research the effect of finish rolling technique parameters on the H2S corrosion resistance behavior of pipeline steel in the thickness direction, especially concerning microstructure and hardness in the thickness direction. So, for the research, optical microscope (OM), hydrogen-induced cracking tests (HIC), and hardness tests were used to study the effect of finish rolling technique parameters on H2S corrosion resistance. As finish rolling deformation increases, deformation can effectively conduct from surface to center and reduce the average hardness gap between the surface and the center. It can also generate finer microstructure and smaller hardness differentials from the thickness direction. All these can enhance the hydrogen-induced cracking resistance.
Shape and roundness accuracy prediction of the roll grinding based on improved Elman neural network
Authors: Gao Hui-Min , Ren Xin-Yi , Xu Hai-Wei , Ai Jiao-Jian , Guo Min 
Published: September 2024

Abstract
Due to the strong nonlinear relationship between the shape and roundness of the roller and the grinding process parameters, a prediction method for roll shape error and roundness error based on an improved Elman neural network is proposed. During the training process of the Elman neural network, Sine chaotic mapping is used to make the population distribution more uniform, and the sparrow search algorithm is used to obtain the optimal parameters of the Elman neural network. The verification results show that the prediction errors of the roll shape and roundness are both less than 10%, and the accuracy of the prediction model is higher than 85%, which proves the effectiveness of the proposed method.
Research on the effect of manufacturing processes on the fatigue life of TC4 fasteners
Authors: Ma Yanyun , Dou Zhaofeng , Li Haoshan , Wang Ruiyuan , Xia Yanfeng , Gao Qiu , Zhang Weifang 
Published: September 2024

Abstract
TC4 fasteners have the characteristics of high specific strength and yield ratio, excellent high and low temperature performance, corrosion resistance, etc., and are widely used in many fastener fields, including aerospace. In long-term use, fatigue fracture has become the main failure mode of TC4 bolt fasteners. The common manufacturing processes of TC4 fasteners include shot peening, bottom corner rolling pressure, anodizing and molybdenum disulphide coating, etc. At present, few researchers have studied the effect of the stress level of the manufacturing process on the fatigue life of TC4 fasteners. Therefore, this paper designs the process and parameter influence test from the perspective of different manufacturing processes, and analyses the fatigue test results to reveal the influence mechanism of different processes on the fatigue life of TC4 fasteners. The research results show that the increase of residual compressive stress greatly improves the fatigue strength of fasteners, the shot peening process improves the fatigue life of TC4 fasteners by increasing the residual stress of fasteners, and rolling pressure also increases the surface residual compressive stress. However, it is necessary to find suitable rolling parameter values, and anodizing reduces the residual compressive stress of fasteners. The coating of molybdenum disulfide also reduces the residual stress value of the fastener surface and leads to a decrease in fatigue life. Therefore, in order to control the fatigue life of TC4 fasteners, it is necessary to carry out the shot peening process, and control the rolling pressure, anodizing time and the coating thickness of molybdenum disulfide. The research in this paper provides a reference for the subsequent research on fastener fatigue strength control.
Study on no IMC Solid state bonding method for high-density 2.5D/3D integration
Authors: Li Zongyang , Qu Zhibo , Yao Quanbin , Lin Pengrong , Xie Xiaochen , Guo Hengtong , Wang Jiaxing , Hou Pengyan , Gu Songzhao 
Published: September 2024

Abstract
Chiplet integration is a new development direction for the continuation and even goes beyond Moore’s Law, and in order to achieve the high density, high reliability, high-speed Chiplet device, a new method of 2.5D/3D integration approach is needed to fulfill the needs to Chiplet heterogeneous devices. In this work, two dies were successfully bonded via low energy input with no IMC solid state bonding under 220°C and 5 MPa, which is much gentler than the other solid state bonding approaches. Each die had a matrix of 22500 Cu pillars with a diameter of 20 μm. This method was promising for the near future high-density 2.5D/3D integration.
Influence of multi-process parameter linkage on the formation of lack of fusion defects based on SYSWLED simulation analysis
Authors: Yan Chen , Yang Die , Han Laihui , Zhao Zhonggang , Li Zengzhen , Sui Yongli 
Published: September 2024

Abstract
The lack of fusion defects remains a significant challenge in narrow-gap automatic welding of pipeline circumferential joints and then becomes the primary factor affecting pipeline longevity. The influence of multi-process parameter linkage on the welding temperature field and formation of lack of fusion defects was investigated based on orthogonal experiments and SYSWELD finite element simulation. The results indicated that welding current and speed had the most significant influence on the welding temperature field. At the same time, oscillation width affected the ability to obtain arc temperature on both sides of the weld groove. Oscillation time and edge dwell time determined the duration of arc heating on one side of the groove. A serrated temperature field morphology may occur when the dwell time is too long, leading to a lack of fusion defects. There were interactive effects among various welding parameters. Increasing heat input could reduce the risk of a lack of fusion defects. Besides, a reasonable setting of oscillation width, oscillation time, and edge dwell time could also reduce the formation risk of lack of fusion defects.
Structural, magnetic, and electrical properties of LaMnO3 doped with Na by microwave-assisted synthesis method
Authors: Chen Guohao , Jiang Luwen , Li Chunlai , Wei Yiqun , Hu Guoqing , Yue Yutao , Wang Xiaomeng , He Jin 
Published: September 2024

Abstract
The electric and magnetic transport properties of La1-xNaxMnO3 (x = 0.15, 0.2, 0.25, 0.3) are studied using the X-ray diffraction (XRD), vibrating sample magnetometer (VSM), and four-probe resistivity measurement method. The samples are synthesized by the method of microwave heating. The obtained samples show phase changes around x = 0.25. The magnetization measurement shows the curie temperature (Tc) increases as the level of doping increases and saturates around x = 0.25. The resistivity measurement dramatically decreases at a metal-insulator transition temperature close to Tc. These findings are discussed along with the structural features of different Na concentrations.
Parametric analysis of vibration characteristics of laminated composite plate structures
Authors: Zhai Yanchun , Zhang Xiaoxue , Zhou Yuesong , Wan Zhiyuan 
Published: September 2024

Abstract
In order to conduct the vibration performance of laminated composite structures, the relationship between the vibration frequency and the parameters such as aspect ratio, width-thickness ratio, elastic modulus ratio and lay-up angle of the plate structure under different boundary conditions was investigated and the variation law of its vibration characteristics was obtained. The conclusions are as follows: 1. The vibration frequency tends to be smaller and smaller as the value of length increases. 2. The vibration frequency tends to be larger and larger as the value of thickness increases. 3. The vibration frequency increases with the increase of the value of elastic modulus.4. The symmetrical lay-up structure with the lay-up angle of the middle ply at 45 degrees has the lowest vibration frequency.
Simulation analysis and test of the spinning process of 304 stainless steel cylindrical parts
Authors: Guo Yaming , Huang Tao , Zheng Yuan , Xu Hengqiu , Huang Mingzhi , Chen Hongwei , Xia Nan , Chen Kai 
Published: September 2024

Abstract
Taking the difference in wall thickness as the evaluation index, the simulation analysis of the spinning process of 304 stainless steel cylindrical parts is carried out. The influence of the roller nose radius, feed speed, and percent thickness reduction on the stress and strain of the roller is studied, and the optimum combination of process parameters is obtained. Through the spinning test, the stainless steel cylindrical parts with an outside diameter of 300.8 mm are successfully spun. After spinning forming and solution treatment, the tensile strength of stainless steel reaches 557~566 MPa, the yield strength reaches 220~232 MPa, and the elongation reaches 41.3%~42.5%.
Electronic and transport properties of 2D α-AsP/α-AsP van der Waals homojunction: A first principle study
Authors: Hong Wei , Zeng Xiandong , Mao Yuliang 
Published: September 2024

Abstract
Following the successful experimental synthesis of α-AsP materials, we design a 2D α-AsP/α-AsP homojunction and use first-principles calculation to study the structural stability, optoelectronic properties, and transport characteristics. The AB-stacked α-AsP/α-AsP is found stable, exhibiting a direct band gap of 1.038 eV. Under a 6% biaxial compressive strain, the electronic properties of α-AsP/α-AsP are transited from semiconductor to metallic. The introduction of an external electric field resulted in a reduced band gap and the emergence of metallic characteristics. Compared with that in monolayer structure, the light absorption in bilayer α-AsP is enhanced. Transport simulations based on a two-probe model reveal promising electron transport properties in the 2D α-AsP/α-AsP homojunction. These findings suggest that 2D α-AsP/α-AsP homojunction has potential application in nanoscale optoelectronic devices.