Journal of Physics Conference Series

Abstract Leakage occurred in stainless steel pipes conveying a 30% KOH solution in an electrolytic hydrogen production unit after one year of service. The leakage pipe consisted of straight pipe and elbows by welding. This study aims to determine the cracking failure causes based on non-destructive testing, visual observation, fracture surface analysis, microstructure investigation, chemical comp…

Abstract In this paper, for the electron beam weldments of TC11 and Ti-22Al-25Nb, the evolution of microstructures in fusion zone and heat affected zone as well as the changes in mechanical properties are investigated through isothermal forging deformation and subsequent heat treatment effects. The results show that the weld fusion zone of the two alloys after vacuum electron beam welding is main…

Abstract Thixomolding is an innovative and sophisticated processing technique for fabricating magnesium matrix composites. In this study, SiC P /AZ91D composites were prepared by thixomolding using SiC particles as reinforcement phase. The influence of SiC P reinforcements on the microstructure and mechanical properties of the thixomolded AZ91D alloy were investigated via optical microscopy (OM),…

Abstract Iron nitride composites (γ′-Fe 4 N/ε-Fe 3 N) were successfully synthesized via gas nitridation using atomized iron powders with an average particle size of 30 μm under NH 3 /N 2 atmosphere conditions. A systematically investigation was conducted to explore the effects of different nitriding temperatures on the microstructures and magnetic properties of iron nitride composites. The precip…

Abstract Preforms with a volume fraction of 60% were prepared by the compression molding method. SiC/Al composites were prepared by the pressureless infiltration process. Analytical characterization of SiC preforms and SiC/Al composites was obtained using metallurgical microscopy, X-ray diffractometry (XRD), scanning electron microscopy (SEM), etc. The effects of magnesium additives and infiltrat…

Abstract This study examined the impact of incorporating varying quantities of red mud (a primary by-product of the aluminum industry) on the microstructure and tensile properties of the M142 eutectic aluminum-silicon alloy. Researchers utilized red mud as a raw material, initially applying chemical deposition nickel coating technology before integrating it into the M142 eutectic aluminum-silicon…

Abstract A dual three-phase permanent magnet synchronous motor (DTPMSM) is widely applicable in high-performance electric drive systems due to high power density, fault tolerance, and low torque ripple. Achieving multivariable control of fundamental and harmonic currents in DTPMSM remains challenging. To solve this issue, this paper proposes a current regulation method for DTPMSM based on finite …

Abstract The Ni-coated red mud/Al-5.4Cu-0.7Mg-0.6Ag-based composite materials were fabricated by gravity casting, and the Ni-coated red mud particles were prepared via chemical deposition. The effect of the content of nickel-coated red mud particles on the microstructures and high-temperature tensile properties of these composites was analyzed. The results demonstrate that the addition of trace a…

Abstract This study develops a multiscale modeling framework integrating finite element simulation, CALPHAD thermodynamics, and phase-field modeling to investigate microstructural evolution during semi-solid slurry preparation of Al-7Si alloy via the SEED process. The established non-isothermal phase-field model dynamically couples temperature and concentration distributions, updating solute part…

Abstract As electronics continue to shrink in size, the demand for miniaturized heat pipes used in cooling applications has surged. This trend imposes stringent requirements on the shell material, particularly oxygen-free copper tubes, which must exhibit excellent bendability without significant wrinkling. Consequently, precise control over the microstructure of the oxygen-free copper tubes has b…

Abstract This study explores the design of an Arduino-based intelligent handling robot control system suitable for material handling tasks within structured spaces. The robot starts, scans a QR code to obtain and display the handling sequence, tracks to the material area of the shelf, identifies the material by color, grabs and carries it to the processing area for temporary placement, and then d…

Abstract The inverse design of achromatic metalens represents a critical challenge in the development of compact optical systems. In this work, a deep reinforcement learning (DRL) framework based on a multi-head Deep Q-Network (Multi-Head DQN) is proposed. By sharing an encoder and deploying parallel Q-network heads, phase modulation actions are evaluated across different wavelengths for each rin…

Abstract High-power-density and high-charging-performance chargers are the core equipment of intelligent humanoid robots. This paper designs a three-stage charger that can achieve both high power factor control on the grid side and low harmonic DC output of the charger. The three-stage charger, composed of a Boost PFC rectifier, a resonant CLLC DC converter, and a Buck / Boost DC converter, is de…

Abstract For the front stage rectifier of a vehicle charger with wide input voltage (85∼265 VAC) and wide load range (0∼6.6 kW), a hybrid control strategy of “DPCC+ADRC” is proposed in this paper. The current loop adopts deadbeat predictive control, and the voltage loop adopts active disturbance rejection control to realize the deep integration of “DPCC+ADRC” and effectively suppress the bus volt…

Abstract A type of aluminum-lithium alloys with high content of Li had been developed to pursuit high specific stiffness and strength using for aircraft lightweight. While the balance of mechanical performance and tailoring mechanism are still important research direction. For a designed novel Al-3.0Cu-2.0Li-0.4Mg-0.4Ag-0.3Mn-0.1Zr alloy, a relationship is given on characteristics of multiple pre…

Abstract There is a decisive relationship between the web tension in the winding section and paper quality. To ensure the paper quality of high-speed paper machines, an intelligent control method for web tension in the winding section of high-speed paper machines is proposed. The working process of the winding section of high-speed paper machines is simulated, and the real-time web tension in the…

Abstract Springs are susceptible to fatigue fracture due to wear and stress concentration in dynamic impact, cyclic loading and harsh environments. In this study, the fracture failure mechanism of a defense-related spring 65Si2MnWA was investigated. The microstructure, micro defects, elemental compositions and fracture morphologies of the failed spring were characterized by light microscopy (OM),…

Abstract With the progressive replacement of early-21st-century wind-power equipment, end-of-life wind-turbine blades made of carbon-fiber-reinforced polymer (CFRP) present a significant disposal challenge due to their poor natural degradability, making pyrolysis the mainstream treatment route. To simplify processing and minimize fiber damage, this study investigates direct pyrolysis of structura…

Abstract During the preparation of nanoparticle-reinforced aluminum matrix composites via liquid-state methods, the agglomeration of nanoparticles within the aluminum melt remains a critical challenge. In this study, the Discrete Element Method (DEM) is employed, and a non-contact van der Waals force model based on Hamaker theory was implemented via API, enabling a more realistic representation o…

Abstract Magnesium alloy has a poor corrosion resistance, especially in marine environments. Based on first-principles calculations, a quantitative prediction on electrochemical polarization potential U α /current ( J tot ) for pure magnesium with chlorine or oxygen adsorption has been done in this work. FCC site for chloride and HCP site for oxygen are figured out by adsorption energy ( Δ E ads …