bluuebunny/crossref_metadata_2025_split huggingface dataset:
Spherical TiAl Alloy Powders by PREP: Preparation, Microstructure and Properties
Authors: Song M , Zhang Y , Yang Y , Li Y , Yang H , Wang Y , Li Y , Zhang X 
Published: November 2023

AbstractTiAl alloy powders were prepared by plasma rotate electrode pulverization (PREP) with high speed. The effect of preparation process on the microstructure and properties of powders was studied. The results showed that the titanium aluminum powder prepared by PREP method was solid and spherical without satellite powder. The powders had two morphologies: cracked surface and smooth surface. The relationship between particle size and surface morphology was as follows: the smaller the particle size, the smoother the surface. Ti, Nb and Gr elements were uniformly distributed, while Al elements were segregated, but no alloy element loss occurred. The powderswere mainly composed ofγ-TiAl and α2-Ti3Al phase and contained a small amount of NbCr2phase. The average thickness of laminates ofα2+γwas about 0.2μm. Thelamellar thickness of γ phase was about 20nm. The long axis of NbCr2phase was 200nm, and the short axis was 50 ~ 100nm. The higher the rotating speed of the electrode, the smaller the particle size and the higher the sphericity of the powders. With the increase of plasma generator current, the particle size decreased and the sphericity increased. The yield of - 100 mesh ~ + 325 mesh powders for EBSM molding could reach more than 80.68 %, when42000r / min and 670A process parameters were adopted.
Preparation process and development trend of gold conductor slurry
Authors: Zhu Jiaqing , Guan Junqing , Bao Jinxiang , He Xin 
Published: November 2023

AbstractThis article provides an overview of the development of electronic slurries. It summarizes the development and preparation processes of the various components of traditional gold conductor slurries, as well as the process flow for mixing each component to prepare the gold slurries. Then, it analyzes the problems in the development of the domestic gold slurry industry and makes a certain degree of prediction for the future development trend of gold conductor slurries based on the development of the entire industry.
Tensile Properties of DD15 Single Crystal Superalloy at Different Temperature
Authors: Shi Z X , Liu S Z , Zhao J Q 
Published: November 2023

Abstract
DD15 single crystal nickel-based alloy was prepared by a directional solidification induction heating furnace and its tensile properties were investigated at the 23°C, 400°C, 800 °C, 1100°C and 1140°C. The tensile fracture mechanism of the alloy at different temperature was investigated. Results indicate that tensile strength of the alloy reduces first, increases afterward, and decrease sharply at last as the test temperature rises, while the tensile plasticity exhibit the reverse change trend. The extension strength of the alloy is superior to that of EPM-102 alloy. At 23°C, 400°C and 800°C, the tensile fracture mode of the alloy is quasi-cleavage mechanism, and at 1100°C and 1140°C that is dimple model. As tensile fracture at 23°C, 400°C and 800°C, the γ′ precipitate nearly keeps cube shape, while that becomes rectangular after tensile fracture at 1100°C and 1140°C. The APB and stacking fault can be seen in the γ′ phase at 23°C, 400°C and 800°C. There is dislocation networks at the γ/γ′ interface and the deformation characteristic is dislocation by-passing mechanism at 1100°C and 1140°C.
Surface precipitate analysis of gas atomized Ni-Base superalloy powders
Authors: Liu Y F , Zhang L C , Xu W Y , Liu N , Yuan H , Fan X S , Wang S X , Shen J K , Li Z , Zhang G Q 
Published: November 2023

Abstract
Powders surface precipitate has strong relations with the microstructure and properties of powder metallurgy components. Morphology, element distribution and crystal structure of the precipitate at gas atomized Ni-base superalloy powders surface were investigated. Results show that the precipitate is lamelliform and prefers to form at grain boundaries and interdendrite regions than dendrite arms. With powders size decreasing, the precipitate shape observed from surface varies from strip to rectangular and to nearly round, and the precipitate density increases, measured 17.75 μm−2, 21.42 μm−2, 26.50 μm−2 at nearly 45μm, 30μm and 10μm powders surface respectively, but the precipitate average size changes conversely, that is 228nm, 193nm, 77nm respectively. The precipitate enriches in high melting point elements Ti, Nb, Mo, W, Zr and poor in low melting point elements Ni, Cr, Co, Al. Crystal structure analysis reveals that the precipitate is MC, M23C6 or M6C carbide.
Space radiation environment adaptability of the domestic 5056 high-performance aluminum honeycomb
Authors: Wu Haisheng , Liu Baorong , Wang Xiangke , Xu Ting , Wei Yuxuan , Jin Nan , Yu Shuai , Lv Qi , He Cheng 
Published: November 2023

Abstract
In order to investigate the influence of space radiation environment on the performance of domestic 5056 high-performance aluminum honeycomb core, the effects of different irradiation effects and different radiation doses on the nodal strength and mechanical properties of domestic 5056 high-performance aluminum honeycomb core were studied through space radiation environmental tests and mechanical property tests such as high-energy electron irradiation, γ-ray irradiation, ultraviolet irradiation, hot and cold shock test, vacuum volatilization test. The results show that under multiple environmental conditions such as high-energy electron irradiation γ-ray irradiation, ultraviolet irradiation, and hot and cold shock environment, the domestic high-performance aluminum honeycomb core shows excellent adaptability to the irradiation environment and can be used for a long time in the extravehicular environment. However, when the radiation dose is greater than 2 × 109rad, the strength of honeycomb core nodes decreased significantly. The vacuum volatilization test results sindicate that the material meets the gas requirements of aerospace raw materials and has extremely low vacuum pollution characteristics.
Deterioration mechanism of sulfoaluminate concrete at high temperature
Authors: Duan Denghui , Chen Jiajian 
Published: November 2023

Abstract
In order to explore the deterioration law and mechanism of sulfoaluminate concrete under high temperature environment, this paper studied the deterioration law of sulfoaluminate concrete by observing the crack changes of sulfoaluminate concrete samples under different water/cement ratio, different ages and different temperatures after experiencing different high temperatures, and measuring the residual mass ratio, infrared temperature rise, ultrasonic pulse speed and compressive strength. The results show that the loss of strength and mass is the fastest when the temperature of sulfoaluminate concrete is 200 °C, and the loss of strength and mass becomes slower and slower with the increase in temperature. The main reasons for the deterioration of sulfoaluminate concrete are the destruction of microstructure by ettringite and Ca(OH)2 by dehydration at high temperature. The higher the initial strength of sulfoaluminate concrete, the greater the strength loss after high temperature, but the higher the residual strength.
Effect of second-step austempering temperature on mechanical damping of austempered ductile iron
Authors: Zhang Y , Cuo E , Wang L , Feng Y , Zhao S , Liu X , Yi P 
Published: November 2023

Abstract
Austempered ductile iron(ADI) has good strength and toughness, which is widely used in aerospace, engineering machinery and automobile manufacturing. In the above application fields, the requirements of safety and comfort are gradually increasing, so ADI is required not only to have excellent mechanical properties, but also to have high damping properties. The performance of ADI is closely related to its heat treatment method. Therefore, it provides a theoretical basis for the application of ADI, and reveals its mechanism to some extent. The influence of two-step ADI’s mechanical properties and damping properties due to two-step austempering quenching temperature is the main content of this paper. The retained austenite with obvious coarsening of bundle ferrite and increased size is the experimental result obtained after the increase of austempering temperature in the second step. After that, when the austempering temperature in the second step increases, the retained austenite content will directly decrease. The tensile strength of ADI will increase first and then decrease with the increase of austempering temperature in the second step. And the value reaches the maximum of 1350MPa at 360°C. The yield strength of ADI, which reaches the maximum value (1252MPa) at 400 °C, will follow the increase of austempering temperature in the second step, and the elongation and impact energy of ADI will gradually decrease. The elongation and impact energy of ADI will gradually decrease with the increase of austempering temperature in the second step. The minimum values of 4.8% and 42J are obtained when the austempering temperature in the second step reaches 400 °C. The impact fracture morphology shows that the fracture mechanism will change from ductile fracture to brittle fracture with the increase of austempering temperature in the second step. The reason why the internal friction value (Q−1) of ADI with different austempering temperatures in the second step increases gradually is the increase of strain amplitude. There are obvious S-K peaks and Ge peaks, that is, the damping characteristics change with frequency.
On the crashworthiness of aperiodic chiral mechanical metamaterials: design and modeling method
Authors: Xu Weiyun , Zhang Hanyu , Liu Zhao , Zhu Ping 
Published: November 2023

Abstract
Chiral mechanical metamaterial has become topical in energy absorption for the unusual compression-to-twist deformation determined by the asymmetric chirality geometry of their microstructures. However, the insufficient research on the dynamic crash behavior with high nonlinearity and the lack of efficient design and modeling method have blocked the development of chiral mechanical metamaterials considering crashworthiness. In this work, the structure-property relationship of chiral mechanical metamaterials under medium-strain-rate impact was systematically investigated. We proposed an aperiodic framework considering additive manufacturing which enabled both the ordered and disordered chiral mechanical metamaterials utilizing a screw-theory-based assembly rule. The strut components had variable cross-sections and the joints were fillet-enhanced in order to improve the compressive performance. Meanwhile, the corresponding efficient modeling method for finite element analysis (FEA) was introduced. The constitutive relation, damage criteria, and damage revolution of the 316L stainless steel were established considering strain rate effect. Finally, the deformation mechanisms and energy absorbing capabilities of the proposed chiral mechanical metamaterials were demonstrated and discussed based on the mechanical behaviors and the proposed chirality indexes. The numerical results indicated that the proposed design and modeling method provided an effective paradigm for the crashworthiness design of light-weight materials and structures, facilitating the further applications in fields of automobile, civil engineering, aerospace, etc.
Microstructure, mechanical properties, and energetic characteristics of novel peritectic W
x
NbTiZr medium entropy alloys
Authors: Shen Z D , Ma Z L , Cheng X W 
Published: November 2023

Abstract
Novel W
x
NbTiZr medium entropy alloys (MEAs) with tungsten concentrations of 15–25 at.% were produced using arc vacuum melting. The microstructure formation, mechanical behaviours and energetic characteristics were studied. Peritectic reaction occurs in these alloys, resulting in BCC1 and BCC2 phases with close lattice parameters, along with unique pearl chain structures. The average grain sizes of these alloys are less than 10 μm. W0.75NbTiZr alloy exhibited the most significant grain refinement, resulting in a remarkable combination of strength and ductility. When subjected to high-speed impact, the W
x
NbTiZr projectiles reacted with air and release high amounts of energy. These W
x
NbTiZr MEAs exhibit high density, exceptional mechanical properties, and significant energy release, showcasing their immense potential as high-strength energetic structural materials
Research status of phase change memory and its materials
Authors: Yang Peng , Lyu Baoguo , Ding Zhaochong , Luo Junfeng , He Jinjiang 
Published: November 2023

Abstract
Phase change memory technology is a new technology in non-volatile memory technology. Phase change memory technology has many advantages, such as non-volatility, high reading and writing speeds, better data retention, and strong compatibility with CMOS technology, and has been paid attention to by many researchers. Phase change materials are mainly chalcogenide compound materials. Researchers have done a lot of research on Ge-Sb-Te, Ge-Te, and Sb-Te-based phase change materials and developed some new phase change material systems. In addition, researchers have carried out in-depth research on the phase transition mechanism, but the existing atomic umbrella jump theory, multiple ring theory, resonance bond theory, octahedral structure theory, etc. have not formed a unified understanding of the phase transition mechanism. At present, phase change memory is mainly prepared by magnetron sputtering of phase change material targets, which results in fast deposition and high purity of the prepared film. In this paper, based on the development of phase change storage materials, the system of phase change materials and its phase change mechanism, the phase transition mechanism of phase change memory, the preparation and characterization methods of phase change films, the industrialization progress, and other research work are reviewed.
An Investigation into the Factors and Mechanisms Underlying Corrosion Failure of B10 Copper Tubes in Shipboard Pipelines
Authors: Li Guo , Wenlong Chen , Qiuling Huang , Sichong Jian , Peng Zhou , Lianhua Liu 
Published: November 2023

Abstract
The present study investigated the corrosion behavior and mechanism of B10 copper tubes used for shipboard pipelines through various analytical techniques, including macroscopic inspection, chemical analysis, electrochemical impedance, corrosion product morphology, and physical phase and electron microscopic observation. The research findings revealed that the surface corrosion product film on the B10 copper tube in seawater mainly consists of Cu2O. Furthermore, the corrosion behavior under actual working conditions was attributed to crevice corrosion, non-electric coupling corrosion, and the corrosion mechanism was found to be the result of the combined effect of oxygen concentration difference cell and occlusion cell autocatalytic effect. These observations provide valuable insights into the corrosion performance of B10 copper tubes in seawater, which could potentially aid in improving their durability and reliability in marine applications.
Fracture failure analysis of the main shaft of a large sewage treatment equipment
Authors: Wang Kun , Feng Chun , Zhu Lijuan , Wang Xinhu 
Published: November 2023

Abstract
In view of the main shaft fracture failure accident occurred in the service process of a sewage treatment equipment, this paper carried out the fracture macro analysis, chemical composition analysis, material mechanical properties testing, metallographic structure analysis, fracture micro morphology analysis of the failure of the main shaft. The analysis results show that there are cold cracks in the weld and toe of the main shaft of the equipment, and the cracks expand under the action of rotating and bending alternating loads. The main shaft speed of the equipment is 3r/min, the load change frequency is very small, and the corrosive medium has sufficient time to play a role in the crack tip, fatigue cracks further propagated, leading to corrosion fatigue fracture of the main shaft. So in order to prevent this kind of failure, it is suggested to improve the welding process regulations for the equipment of the main shaft and rationally select welding materials.
Research on micro strain and sub grain size of each texture in 6A16 Al sheet
Authors: Shuming Wang , Baiqing Xiong , Pu Li , Zhihui Li , Xiwu Li 
Published: November 2023

Abstract
The micro strain and sub grain size of each texture type in cold rolled 6A16 Al alloy sheet were calculated using X-ray line broadening method, and the effects on the texture transformation during recrystallization process were investigated. The results showed that strain in R/S was the largest, and Brass, Copper, Goss in sequence, the sub grain size in R/S was the least, and Brass, Goss, Copper in sequence, which was coincident with the texture transformation speed during solid solution process, meanwhile, the contents of recrystallization texture, such as R/S, Cube and CubeND20 reduced obviously as the cold rolling stored energy released when recovery process imported before solid solution. It was conformed that the recrystallization texture transforming was influenced by stored energy significantly.
Application and research of titanium alloy oil drill pipes
Authors: Ma Dong , Zhu Shidong , Zhang Kai , Zhu Lijuan , Zhou Yang 
Published: November 2023

Abstract
The complex and harsh drilling environment has put forward higher requirements and standards for future drilling tools. Compared with other drill pipes, titanium alloy drill pipe has a series of characteristics such as high specific strength, excellent corrosion resistance, fatigue resistance, and non-magnetic, making it be the first choice of material for oil and gas drilling in unconventional deep well, deep sea and other harsh environments. This paper discussed the design and microstructure properties of titanium alloy drill pipes in terms of alloy composition, service performance as well as pipe body processing and joint connection. Combined with the development of the application and standards of titanium alloy drill pipe, the prospects of the development and application of titanium alloy drill pipe in unconventional drilling operations such as deep wells and ultra-deep wells were foreseen, in order to provide support for promoting the application and development of titanium alloy drill pipe in the oil fields.
Process Analysis of DLP Photocuring 3D Printing with Modified High-strength Resin
Authors: Sang Jian , Jiang Kai , Li Rui , Xu Gui-Long , Zhao Xin-Xin , Gao Chen , Wei Zi-Zhong 
Published: November 2023

Abstract
The excellent properties of graphene oxide, along with its dispersibility and hydrophilicity, make it suitable for blending with other substrates to obtain reinforcements. In this paper, high-strength photosensitive resin is mixed with graphene oxide to obtain reinforced photosensitive resin. The impact of different mass fractions of graphene oxide on the appearance, dimensional accuracy, bending strength, tensile strength, and fracture morphology of printed samples is investigated using DLP surface molding 3D printing technology. As the mass fraction of graphene oxide increases, the size error of the printed sample decreases, while the bending strength and tensile strength increase, indicating a favorable bonding effect. However, when the mass fraction of graphene oxide exceeds 0.6%, the bonding between the two materials becomes poorer, leading to the opposite outcome. The hierarchical influence of different parameters on the tensile strength of mixed-material DLP printed samples can be summarized as follows: graphene oxide content exhibits the strongest influence, followed by layer thickness, exposure time, and exposure intensity.
Pipeline Internal Surface Detection based on Convolutional Neural Networks and Code Wave Time-Frequency Transform
Authors: Xue Xianwen , Chen Bowei , Jiang Hao , Li Mengyuan 
Published: November 2023

Abstract
This study introduces an innovative approach that integrates principles of coda wave interferometry, wavelet transform, convolutional neural networks, and deep learning for the analysis and detection of contaminants within pipelines. The primary objective of this method is to identify various types of contaminants, enhance contamination detection sensitivity and accuracy, thereby providing an effective solution for monitoring and remediation in the oil and gas pipeline transportation industry. The findings of this research offer valuable insights and serve as a significant reference for improving pipeline cleaning practices. Further optimization can be explored through enhancements in the model architecture, the incorporation of data augmentation techniques, and the exploration of alternative training strategies. However, the performance of this method still requires further study and improvement. The study encompasses the following key aspects: Firstly, ultrasonic analysis is employed to characterize the structural properties of contaminants, enabling the extraction of crucial structural features and performance parameters through the analysis of ultrasonic echo signals. Secondly, wavelet transform is applied to conduct comprehensive time-frequency analysis of the ultrasonic echo signals, facilitating the capture of distinctive features associated with contaminants across different frequency bands and time scales. Thirdly, convolutional neural networks, specifically leveraging the VGG-16 model, are used to extract informative features from the ultrasonic signals and perform classification. Through rigorous training and fine-tuning processes, the model achieves precise identification of contaminant types and estimation of their thickness.
Effect of low dose irradiation of heavy ion on electrochemical corrosion and IASCC behavior of austenitic steel
Authors: Gao Junxuan , Cao Han , Li Dongxing , Fan Yu , Zhang Peng , Zheng Quan , Zhong Weihua 
Published: November 2023

Abstract
The impacts of low dose irradiation on the behavior of electrochemical corrosion and irradiation assisted stress corrosion cracking for 321 stainless steel were studied using Fe2+ ion irradiation to simulate neutron radiation damage in primary circuit environment of pressurized water reactor. Low dose irradiation can improve the pitting resistance and reduce the cracking tendency of the alloy in B-Li solution to a certain extent, which was related to the δ phase content on the near-surface of the sample: The higher δ phase content on the near-surface of the 2 dpa irradiated sample was observed by grazing incident X-ray diffraction. In addition, the pits was significantly increased near micro-cracks for the unirradiated sample, indicating that the existence of pits induced the initiation of cracks. The research results provided an important reference for the failure mechanism of irradiation assisted stress corrosion cracking of core components.