Article
Nanoscience & Nanotechnology
H. Zhang, M. Y. Zhao, J. F. Zhang, X. L. Zhao, F. Fang, N. Jia
Summary: In this study, a heavily N-doped FeMnCoCr high-entropy alloy with multiple heterostructures was prepared by mechanical alloying and spark plasma sintering. The alloy exhibited a high compressive yield strength and satisfactory fracture strain at room temperature.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Polymer Science
Jaesik Seo, So Young Shin
Summary: The peel-off strength of electroplated specimens increases with increasing ABS content, and the S-dr ratio can effectively predict the adhesion strength of metal-polymer interfaces.
JOURNAL OF APPLIED POLYMER SCIENCE
(2023)
Article
Materials Science, Multidisciplinary
Chao Li, Jianwei Teng, Biaobiao Yang, Xianjue Ye, Jiantao Liu, Yunping Li
Summary: The novel Co-Ni-based superalloy manufactured by powder metallurgy process exhibited higher mechanical properties compared to the corresponding casting alloy, mainly due to the higher contribution from grain boundary and precipitation strengthening.
MATERIALS CHARACTERIZATION
(2021)
Article
Materials Science, Multidisciplinary
J. M. Mendoza-Duarte, F. C. Robles-Hernandez, E. Rocha-Rangel, Y. Todaka, N. Adachi, I Estrada-Guel, C. G. Garay-Reyes, M. A. Ruiz Esparza-Rodriguez, R. Martinez-Sanchez
Summary: Induction heating can be used to produce highly densified samples with increased hardness and yield strength. The mechanical response can be attributed to two main reinforcement mechanisms: dislocations obstruction and grain refinement.
JOURNAL OF MATERIALS RESEARCH
(2021)
Article
Thermodynamics
Raquel de Oro Calderon, Christian Gierl-Mayer, Herbert Danninger
Summary: The sintering stage is crucial for establishing microstructure and properties in powder metallurgy processing. Thorough studying of the chemical and metallurgical processes occurring during sintering is essential for optimal product properties. Thermoanalytical techniques combined with mass spectroscopy enable in-situ characterization of the sintering process from multiple perspectives.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2023)
Article
Engineering, Mechanical
Keli Vanessa Salvador Damin, Alicia Correa Lucena, Bruno Borges Ramos, Aloisio Nelmo Klein, Tatiana Bendo, Jose Daniel Biasoli de Mello, Cristiano Binder
Summary: The present study investigated the addition of molybdenum to a Fe + 0.6% C + 3% SiC self-lubricating composite through plasma treatment and powder mixing methods. The results showed that plasma treatment with an average content of 1.6 wt % Mo in the first 10 μm achieved the best tribological properties, with a significant increase (4500%) in scuffing resistance and a reduction in friction coefficient. Surface enrichment of self-lubricating composites was proven to be a viable, cost-effective, and reliable alternative for improving their tribological properties.
Article
Chemistry, Multidisciplinary
Changyu Hu, Jianhua Liu, Lei Xu, Lingfei Yu, Beiping Zhu
Summary: Carbon fiber-reinforced titanium matrix composites were prepared using powder metallurgy method and the morphology and conductivity were investigated. The results showed that carbon fibers had a significant strengthening effect on titanium-based composites and the porosity and resistivity could be optimized at an appropriate sintering temperature.
Article
Chemistry, Physical
Guo-Jiun Shu, Cun-Jheng Huang, Wei-Xiang Chien, Pei Wang, Ming-Wei Wu
Summary: The powder metallurgy process was successfully used to manufacture two Fe-based laminated metal composites, showing good performance and demonstrating feasibility in production.
Article
Materials Science, Multidisciplinary
Xiufang Gong, Yankang Yu, Tianjian Wang, Ye Liu, Lin Zhang, Zhenhuan Gao, Hou Ziyong, Xu Chen, Shuang He, Xuanhui Qu
Summary: The wide-gap defects of Mar-M247 superalloy were repaired using powder metallurgy method. A new interlayer alloy was designed with high B and Zr content based on the isothermal solidification principle. The interlayer alloy had a low melting temperature (1100 degrees C) and a contact angle of about 70 degrees with the Mar-M247 substrate. A powder mixture consisting of 80 wt% substrate powder and 20 wt% interlayer alloy powder was used as a filler to repair a 2 mm wide gap. After being repaired at 1230 degrees C for 2 h, a nearly dense gap was obtained. MC-type carbides, MB2-type borides, M3B2-type borides, and Ni5(Zr,Hf)-type intermetallics were observed in the liquid zone. After post-weld heat treatment, the block borides, chain carbides, and eutectics were successfully removed, and the tensile strength of the bonding zone approached that of the Mar-M247 superalloy.
METALS AND MATERIALS INTERNATIONAL
(2023)
Article
Materials Science, Multidisciplinary
Mohammad Hossein Adib, Reza Abedinzadeh
Summary: In this study, aluminum matrix composites reinforced with different amounts of SiC and Al2O3 nanoparticles were fabricated using powder metallurgy technique. The specimens were characterized by various methods and the results showed that increasing SiC content to 10 wt% improved the hardness and wear resistance of the nanocomposite samples. The dominant wear mechanism was found to be abrasive wear accompanied by oxidation wear. Additionally, the hybrid composite sample containing 7.5 wt% nano SiC exhibited the highest tensile strength compared to other hybrid composites.
MATERIALS CHEMISTRY AND PHYSICS
(2023)
Article
Materials Science, Multidisciplinary
Zhaoqiang Tan, Yong Liu, Xiaolin Huang, Songlin Li
Summary: Porosity and phases are key factors for the fatigue performance of powder metallurgy steels. This paper comparatively analyzes the fatigue strengths of two types of alloy steels sintered from different powders. The analysis focuses on the geometry of porosity, phases constitution, and fractography of fracture. The fatigue fracture modes differ between the two materials. A modified Murakami model considering micro-scale defects and micro-hardness is effective in predicting the fatigue performance.
Article
Chemistry, Physical
A. D. Bazhina, P. M. Bazhin, A. P. Chizhikov, S. Konstantinov, A. M. Stolin
Summary: A compact material based on initial powders of titanium and aluminum was obtained by unrestricted SHS-compression, with studied structure and phase composition showing that high-temperature shear deformation leads to a textured structure with alternating intermetallic phases. The influence of high-temperature annealing on the material structure and phase composition was also examined.
Article
Materials Science, Multidisciplinary
Yuanyuan Zhang, Jikang Li, You Wu, Qingshuai Feng, Jiantao Liu, Tong Liu
Summary: The effects of solution treatment temperature on the microstructure of a nickel-based powder metallurgy superalloy were studied. The grain growth of the gamma matrix was influenced by the pinning of the primary gamma ' phase and the size of carbides. The grain growth model was established, and the activation energy of grain growth was calculated. The dissolution of primary gamma ' precipitates and the increase in size of secondary gamma ' precipitates with solution temperature were observed. The hardness variation of the samples was mainly affected by the combined effects of grain size and the size of gamma ' precipitates.
ADVANCED ENGINEERING MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Ali Ajani, Hussain Gilani, Sumaiya Islam, Neamul Khandoker, Abdul Md Mazid
Summary: The study focuses on manufacturing CNT-reinforced surface composites of aluminum alloy using friction stir processing, achieving high strength and ductility. Scanning electron microscopy revealed the fracture surface morphology, and the highest temperature rise during FSP did not lead to melting of the material.
Article
Materials Science, Multidisciplinary
Serhii Lavrys, Iryna Pohrelyuk, Juozas Padgurskas, Khrystyna Shliakhetka
Summary: The wear resistance of highly porous titanium in the tribo-pair with bronze under boundary lubrication condition was found to be poor due to subsurface pores leading to micro-crack nucleation. Surface engineering methods such as deformation, diffusion, and their combination were effective in improving the wear resistance by changing the main wear mechanism from adhesive and fatigue to abrasive. The highest wear resistance was achieved through a combination of surface deformation and diffusion treatment.
Article
Materials Science, Multidisciplinary
Mohammad Reza Jandaghi, Abdollah Saboori, Gholamreza Khalaj, Mohammadreza Khanzadeh Ghareh Shiran
Article
Materials Science, Multidisciplinary
Omid Fakhimi, Abolhassan Najafi, Gholamreza Khalaj
MATERIALS RESEARCH EXPRESS
(2020)
Article
Materials Science, Multidisciplinary
Safarali Feleh Shargh, Abbas Saadat, Abolhassan Najafi, Mohammad-Reza Khanzadeh Gharehshiran, Gholamreza Khalaj
MATERIALS RESEARCH EXPRESS
(2020)
Article
Chemistry, Physical
Saleh Asnaashari, Mohammad Ghambari
Summary: The study utilized the rapid omnidirectional compaction method to produce tungsten carbide-cobalt alloy, achieving high density and hardness of components by controlling pressure, temperature, and pressing time, thus demonstrating high production efficiency.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Materials Science, Multidisciplinary
Hesam Pouraliakbar, Reza Beygi, Vahid Fallah, Asal Hosseini Monazzah, Mohammad Reza Jandaghi, Gholamreza Khalaj, Lucas F. M. da Silva, Matteo Pavese
Summary: Treatment of Al-Cu-Mg alloy using friction stir spot processing (FSSP) allows for microstructure modification by adjusting tool rotation speed and pin dwell-time. Microscopy inspections revealed a wide variety in morphological and size evolution of second-phase particles in air-treated samples, while underwater-treated samples showed uniformly refined spherical particles.
Article
Materials Science, Multidisciplinary
Abolhassan Najafi, Mahdi Khoeini, Gholamreza Khalaj, Amirhossein Sahebgharan
Summary: In this study, the synthesis of silver nanoparticles using electronic waste was investigated. By optimizing the dissolution process with nitric acid solution, silver was successfully extracted from the waste parts, leading to the synthesis of nanoparticles with suitable properties. The synthesized particles had a nanometric spherical morphology with uniform size distribution, confirming the effectiveness of using electronic scraps for silver nanoparticle synthesis.
MATERIALS RESEARCH EXPRESS
(2021)
Article
Materials Science, Multidisciplinary
Hamidreza Ahmadi, Gholamreza Khalaj, Abolhassan Najafi, Saloumeh Mesgari Abbasi, Masumeh Safari
Summary: This research investigated the mechanical properties and structural studies of a geopolymer nanocomposite made of metakaolin-red mud/carbon nanotubes. The addition of red mud decreased the strength of the samples, but the addition of carbon nanotubes increased the strength. The FTIR spectra confirmed the realization of the geopolymerization process.
MATERIALS RESEARCH EXPRESS
(2022)
Article
Materials Science, Ceramics
Abolhassan Najafi, Fahimeh Sharifi, Saloumeh Mesgari-Abbasi, Gholamreza Khalaj
Summary: Zirconium carbide nanopowders were synthesized by the sol-gel method in the alcoholic system. The impact of pH and temperature parameters on the synthesis process of these nanoparticles was evaluated. The properties of the product were assessed using various analysis techniques, indicating that the synthesized nanoparticles had good morphology and crystallinity.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Multidisciplinary
Fahimeh Sharifi, Zahra Mahmoodi, Saloumeh Mesgari Abbasi, Abolhassan Najafi, Gholamreza Khalaj
Summary: Titanium carbide nanopowders and nanowhiskers were synthesized using the sol-gel process with phenolic resin and titanium alkoxide as precursors. The synthesis temperature and soaking time were found to affect the free carbon content and the formation and morphology of TiC nanopowders. Nucleation of titanium carbide occurred at approximately 1200 degrees C and ended at 1400 degrees C. The synthesized nanopowders had mesoporous structure with a specific surface area of 150 m2/g, and TiC nanowhiskers heterogeneously nucleated and grew in a soaking time of 3 h. The free carbon content in the synthesized product under 3 h soaking time was less than 1%.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Materials Science, Multidisciplinary
Moein Moradi, Gholamreza Khalaj, Gholamreza Ghaffari, Bahram Abdolmaleki
Summary: In this study, plain carbon steel (A216-WCB) was processed using friction stir processing (FSP) with specific parameters. The FSPed samples were characterized using various testing methods. The results showed a reduction in grain size, an increase in microhardness, an improvement in tensile strength, and an enhanced wear resistance in the FSPed samples compared to the base metal.
KOVOVE MATERIALY-METALLIC MATERIALS
(2023)
Article
Metallurgy & Metallurgical Engineering
Gholamreza Khalaj, Moein Moradi, Ebrahim Asadian
Summary: This study presents the microstructure evolution and mechanical properties of explosive welded steel-bronze bilayer composite sheets before and after rolling. Different welding distances and charge thicknesses were used for dissimilar welding. The rolled bilayer sheets were subjected to ambient and 300 degrees C rolling with a 33.3% thickness reduction. A feasible welding window was developed based on process parameters and samples were fabricated accordingly. The steel-bronze interfaces were classified into four distinct categories based on microstructure and elemental distribution changes. Rolling stretched and flattened the wavy interfaces, compressed the vortex zones, and in some cases submerged them inside the steel part. While most parts of the interface showed proper connection, some parts exhibited local discontinuities. Rolling removed diffusion barriers, brought separate boundaries closer, and established a metallic bond at the bronze/steel interface depending on the force and rolling temperature. Shrinking cavities and pores were also compressed and compacted. The hardness increased after explosive welding and subsequent cold rolling, as hot rolling diminished the interface hardness.
WELDING IN THE WORLD
(2023)
Article
Materials Science, Multidisciplinary
Zhongbin Wei, Abolhassan Najafi, Morteza Taheri, Farzad Soleymani, Neda Didehvar, Gholamreza Khalaj
Summary: The use of an ultrasonic field in the preparation of Ni60A/WC composite coating can effectively eliminate pores and microcracks, while also improving the hardness and wear resistance of the coating.
Article
Electrochemistry
Hamidreza Ahmadi, Gholamreza Khalaj, Farzad Soleymani, Mohammadhossein Moalem, Majid Pourabdollah, Morteza Mahmoudan
Summary: This research investigates the impact of electrolyte composition (NaCl, Na2SO4, and CTAB) on the electrochemical synthesis of Cu2O nanoparticles. The results show that increasing the concentration of NaCl and Na2SO4 enhances the purity of Cu2O, while CTAB effectively inhibits the growth of Cu2O nanoparticles.
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
(2023)
Article
Engineering, Multidisciplinary
Sicheng Jiao, Shixiang Wang, Minge Gao, Min Xu
Summary: This paper presents a non-contact method of thickness measurement for thin-walled rotary shell parts based on a chromatic confocal sensor. The method involves using a flip method to obtain surface profiles from both sides of the workpiece, measuring the decentration and tilt errors of the workpiece using a centering system, establishing a unified reference coordinate system, reconstructing the external and internal surface profiles, and calculating the thickness. Experimental results show that the method can accurately measure the thickness of a sapphire spherical shell workpiece and is consistent with measurements of other materials.
Article
Engineering, Multidisciplinary
Rajeev Kumar, Sajal Agarwal, Sarika Pal, Alka Verma, Yogendra Kumar Prajapati
Summary: This study evaluated the performance of a CaF2-Ag-MXene-based surface plasmon resonance (SPR) sensor at different wavelengths. The results showed that the sensor achieved the maximum sensitivity at a wavelength of 532 nm, and higher sensitivities were obtained at shorter wavelengths at the expense of detection accuracy.
Article
Engineering, Multidisciplinary
Attilio Di Nisio, Gregorio Andria, Francesco Adamo, Daniel Lotano, Filippo Attivissimo
Summary: Capacitive sensing is a widely used technique for a variety of applications, including avionics. However, current industry standard Capacitive Level Sensors (CLSs) used in helicopters perform poorly in terms of sensitivity and dynamic characteristics. In this study, novel geometries were explored and three prototypes were built and tested. Experimental validation showed that the new design featuring a helicoidal slit along the external electrode of the cylindrical probe improved sensitivity, response time, and linearity.
Article
Engineering, Multidisciplinary
Kai Yang, Huiqin Wang, Ke Wang, Fengchen Chen
Summary: This paper proposes an effective measurement method for dynamic compaction construction based on time series model, which enables real-time monitoring and measurement of anomalies and important construction parameters through simulating motion state transformation and running time estimation.
Article
Engineering, Multidisciplinary
Hui Fu, Qinghua Song, Jixiang Gong, Liping Jiang, Zhanqiang Liu, Qiang Luan, Hongsheng Wang
Summary: An automatic detection and pixel-level quantification model based on joint Mask R-CNN and TransUNet is developed to accurately evaluate microcrack damage on the grinding surfaces of engineering ceramics. The model is effectively trained on actual micrograph image dataset using a joint training strategy. The proposed model achieves reliable automatic detection and fine segmentation of microcracks, and a skeleton-based quantification model is also proposed to provide comprehensive and precise measurements of microcrack size.
Review
Engineering, Multidisciplinary
Sang Yeob Kim, Da Yun Kwon, Arum Jang, Young K. Ju, Jong-Sub Lee, Seungkwan Hong
Summary: This paper reviews the categorization and applications of UAV sensors in forensic engineering, with a focus on geotechnical, structural, and water infrastructure fields. It discusses the advantages and disadvantages of sensors with different wavelengths and addresses the challenges of current UAV technology and recommendations for further research in forensic engineering.
Article
Engineering, Multidisciplinary
Anton Nunez-Seoane, Joaquin Martinez-Sanchez, Erik Rua, Pedro Arias
Summary: This article compares the use of Mobile Laser Scanners (MLS) and Aerial Laser Scanners (ALS) for digitizing the road environment and detecting road slopes. The study found that ALS data and its corresponding algorithm achieved better detection and delimitation results compared to MLS. Measuring the road from a terrestrial perspective negatively impacted the detection process, while an aerial perspective allowed for scanning of the entire slope structure.
Article
Engineering, Multidisciplinary
Nur Luqman Saleh, Aduwati Sali, Raja Syamsul Azmir Raja Abdullah, Sharifah M. Syed Ahmad, Jiun Terng Liew, Fazirulhisyam Hashim, Fairuz Abdullah, Nur Emileen Abdul Rashid
Summary: This study introduces an enhanced signal processing scheme for detecting mouth-click signals used by blind individuals. By utilizing additional band-pass filtering and other steps, the detection accuracy is improved. Experimental results using artificial signal data showed a 100% success rate in detecting obstacles. The emerging concepts in this research are expected to benefit radar and sonar system applications.
Article
Engineering, Multidisciplinary
Jiqiang Tang, Shengjie Qiu, Lu Zhang, Jinji Sun, Xinxiu Zhou
Summary: This paper studies the magnetic noise level of a compact high-performance magnetically shielded room (MSR) under different operational conditions and establishes a quantitative model for magnetic noise calculation. Verification experiments show the effectiveness of the proposed method.
Review
Engineering, Multidisciplinary
Krzysztof Bartnik, Marcin Koba, Mateusz Smietana
Summary: The demand for miniaturized sensors in the biomedical industry is increasing, and optical fiber sensors (OFSs) are gaining popularity due to their small size, flexibility, and biocompatibility. This study reviews various OFS designs tested in vivo and identifies future perspectives and challenges for OFS technology development from a user perspective.
Article
Engineering, Multidisciplinary
Yue Wang, Lei Zhou, Zihao Li, Jun Wang, Xuangou Wu, Xiangjun Wang, Lei Hu
Summary: This paper presents a 3-D reconstruction method for dynamic stereo vision of metal surface based on line structured light, overcoming the limitation of the measurement range of static stereo vision. The proposed method uses joint calibration and global optimization to accurately reconstruct the 3-D coordinates of the line structured light fringe, improving the reconstruction accuracy.
Article
Engineering, Multidisciplinary
Jaafar Alsalaet
Summary: Order tracking analysis is an effective tool for machinery fault diagnosis and operational modal analysis. This study presents a new formulation for the data equation of the second-generation Vold-Kalman filter, using separated cosine and sine kernels to minimize error and provide smoother envelopes. The proposed method achieves high accuracy even with small weighting factors.
Article
Engineering, Multidisciplinary
Tonglei Cao, Kechen Song, Likun Xu, Hu Feng, Yunhui Yan, Jingbo Guo
Summary: This study constructs a high-resolution dataset for surface defects in ceramic tiles and addresses the scale and quantity differences in defect distribution. An improved approach is proposed by introducing a content-aware feature recombination method and a dynamic attention mechanism. Experimental results demonstrate the superior accuracy and efficiency of the proposed method.
Article
Engineering, Multidisciplinary
Qinghong Fu, Yunxi Lou, Jianghui Deng, Xin Qiu, Xianhua Chen
Summary: Measurement and quantitative characterization of aging-induced gradient properties is crucial for accurate analysis and design of asphalt pavement. This research proposes the composite specimen method to obtain asphalt binders at different depths within the mixture and uses dynamic shear rheometer tests to measure aging-induced gradient properties and reveal internal mechanisms. G* master curves are constructed to investigate gradient aging effects in a wide range. The study finds that the composite specimen method can effectively restore the boundary conditions and that it is feasible to study gradient aging characteristics within the asphalt mixture. The study also observes variations in G* and delta values and the depth range of gradient aging effects for different aging levels.
Article
Engineering, Multidisciplinary
Min Li, Kai Wei, Tianhe Xu, Yali Shi, Dixing Wang
Summary: Due to the limitations of ground monitoring stations in China for the BDS, the accuracy of BDS Medium Earth Orbit (MEO) satellite orbits can be influenced. To overcome this, low Earth orbit (LEO) satellites can be used as additional monitoring stations. In this study, data from two LEO satellites were collected to improve the precise orbit determination of the BDS. By comparing the results with GPS and BDS-2/3 solutions, it was found that including the LEO satellites significantly improved the accuracy of GPS and BDS-2/3 orbits.
