Article
Automation & Control Systems
Behnam Soltani, Amirreza Farnia, S. H. Mousavi Anijdan
Summary: By adjusting the parameters of dual-pulsed gas metal arc welding, the welding performance and microstructure of AA7075 alloy joints can be effectively improved, thereby increasing their hardness. Increasing the thermal frequency and current amplitude can reduce the grain size of the weld metal and the heat-affected zone, while also enhancing the hardness of these regions.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2021)
Article
Automation & Control Systems
Ping Yao, Heqing Tang, Kun Bin, Meiyi Chen, Kang Zhou
Summary: The double-wire double-pulse gas shielded metal arc welding (DP-GMAW) process is commonly used in stainless steel welding due to its advantages in high cladding rate and welding quality. This study investigated the influence of double-wire DP frequency on weld bead formation and mechanical performance. The experimental results showed that a frequency of 3 Hz achieved the best stability and optimal weld bead formation. Increasing the frequency resulted in fish-scale ripples, smaller grain size, increased hardness, and tensile strength.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2022)
Article
Nanoscience & Nanotechnology
Fengzhi Zhang, Changshuai Wang, Yunsheng Wu, Lanzhang Zhou, Qiang Tian
Summary: The microstructural stability and mechanical properties of a Ni-based wrought superalloy during long-term thermal exposure at 650 degrees C and 700 degrees C have been investigated. The results show that the alloy exhibits excellent thermal stability and high strength after exposure, but the morphology of secondary gamma' precipitates undergoes changes and results in grain boundary embrittlement at 700 degrees C.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Materials Science, Ceramics
Wei -Kai Wang, Yu-Hao Chang, Chih-Feng Jung, Shih-Yung Huang, Pi-Chuen Tsai
Summary: The study investigated the effect of Y2O3: MgO ratio on the microstructures, mechanical properties, and plasma erosion behaviors of Y2O3-MgO (YM) nanocomposite films. Increasing the MgO content disrupted the columnar growth structure of the YM nanocomposite film and refined the Y2O3 grains. A Y2O3: MgO ratio of 40:60 effectively refined the columnar crystal structure of the YM nanocomposite film due to thermodynamic incompatibility. As a result, the YM nanocomposite film exhibited significantly improved strength, with a maximum hardness of 16.78 +/- 0.8 GPa and elastic modulus of 149.24 +/- 4.7 GPa. X-ray photoelectron spectroscopy confirmed the chemical stability of the YM nanocomposite samples even after fluorination. The YM nanocomposite film showed a lower etching depth compared to the commercial Y2O3 film, indicating enhanced erosion resistance.
CERAMICS INTERNATIONAL
(2023)
Article
Materials Science, Multidisciplinary
Zhaoxia Shi, Xiaofeng Yan, Binghong Pei, Cunjiang Tang, Chunhua Duan, Guangwei Han
Summary: Under thermal exposure at 800 degrees C, the microstructural evolution and mechanical properties of superalloy GH4282 were investigated. The rapid precipitation of gamma' phase and the increase in carbides over exposure time were observed. The hardness decreased with prolonged exposure time, while the loss of strength was minimal and ductility showed different variation rules at room temperature and 800 degrees C.
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
(2021)
Article
Green & Sustainable Science & Technology
Kangze Yuan, Wankui Ni, Le Zhao, Haiman Wang
Summary: The stabilization of loess is a matter of concern due to its potential for triggering geological hazards. This study explores the use of silica fume as a stabilizer and investigates its effects on the mechanical properties of loess. The results show that silica fume improves the strength of loess through both chemical and physical stabilization. Life cycle assessment reveals the environmental significance of promoting the use of silica fume in the stabilization of loess foundations.
SUSTAINABLE MATERIALS AND TECHNOLOGIES
(2023)
Article
Multidisciplinary Sciences
Zhimin Liang, Mengzhe Dai, Chenshuo Li, Yiteng Chen, Yuzhong Rao, Dejun Yan, Ying Liu, Dianlong Wang
Summary: This study proposes a novel ultrasonic-frequency pulsed gas metal arc welding (UFP-GMAW) to improve the cross joint defects between FSW and GMAW in aluminum alloy hull fabrication. By reducing the number and size of pores, refining grain size, and improving microstructural uniformity, the mechanical properties of the cross joint are enhanced.
ARABIAN JOURNAL FOR SCIENCE AND ENGINEERING
(2023)
Article
Green & Sustainable Science & Technology
Kangze Yuan, Qingxiang Li, Wankui Ni, Le Zhao, Haiman Wang
Summary: In this study, the unconfined compression strength of loess samples with different graphene contents was measured, and it was found that graphene significantly enhanced the strength of the loess. Micro-structural techniques were used to explore the microstructure and explain the variation in mechanical properties of the samples. The study also compared graphene production methods and found that chemical oxidation had significant advantages in terms of greenhouse gas emissions and cumulative energy demand.
JOURNAL OF CLEANER PRODUCTION
(2023)
Article
Thermodynamics
Rongkun Pan, Cong Li, Jiangkun Chao, Daimin Hu, Hailin Jia
Summary: With the increased depth of coal energy mining in China, the occurrence of coal spontaneous combustion has become more frequent, posing a serious threat to the safe mining of coal energy. Investigating the process of coal oxidation and spontaneous combustion by examining its thermal and microstructural properties is crucial for understanding the mechanism of coal spontaneous combustion. Experimental results show that the thermal properties of coal spontaneous combustion exhibit obvious segmentation characteristics that are independent of metamorphism degree and heating rates, and the initial exothermic temperature is positively correlated with heating rates. The effect of temperature on microscopic characteristics is uneven, but the metamorphism degree shows regular changes in microscopic characteristics. Thermal dynamic balance is an important factor in microstructure changes.
Article
Construction & Building Technology
Dilshad Ali, Rachit Agarwal, Mohd Hanifa, Pradeep Rawat, Rakesh Paswan, Devendra Rai, Inderjeet Tyagi, B. Srinivasarao Naik, Ashish Pippal
Summary: Biochar made from different percentages of sawdust was used to replace cement in cementitious materials, resulting in reduced environmental pollutants and landfill waste. Through various tests, it was found that the addition of biochar improved the hydration products, compressive strength, and thermal properties of the cementitious compounds. The 3 wt% replacement showed the best performance among the three different replacements.
JOURNAL OF BUILDING ENGINEERING
(2023)
Article
Materials Science, Multidisciplinary
Ali Yuruk, Bekir Cevik, Nizamettin Kahraman
Summary: The use of aluminum alloys is increasing rapidly in various industries due to their low density, excellent corrosion resistance, good forming properties, and increasable mechanical properties. However, joining different aluminums and their alloys via welding is very difficult despite their widespread usage areas.
MATERIALS CHEMISTRY AND PHYSICS
(2021)
Article
Chemistry, Physical
Sanja Perac, Slavica M. Savic, Zorica Brankovic, Slavko Bernik, Aleksandar Radojkovic, Sanja Kojic, Dragana Vasiljevic, Goran Brankovic
Summary: The thermoelectric and mechanical properties of NaCo2O4 ceramics were significantly affected by the synthesis procedure and Cu doping concentration. Samples prepared by the citric acid complex method showed higher thermoelectric performance and mechanical properties.
Article
Materials Science, Multidisciplinary
Yanping Guo, Chao Gao, Xiaohui Yang, Tingting Ku, Linzeng Wang, Wenlu Yang, Rujie Hu, Jianyu Cui, Huiqin Chen
Summary: The evolution of microstructure, mechanical properties, and corrosion performance of Al-6Mg and Al-6Mg-1Zn alloys processed using equal channel angular pressing (ECAP) at 200 degrees C is systematically investigated. The study reveals that different T and beta phases are generated in the two alloys, resulting in different grain refinement processes. The fracture strength and corrosion resistance of the Al-6Mg-1Zn alloy after ECAP processing are superior to that of the Al-6Mg alloy.
ADVANCED ENGINEERING MATERIALS
(2023)
Review
Materials Science, Multidisciplinary
Hafiz Muhammad Hamza, Kashif Mairaj Deen, Abdul Khaliq, Edouard Asselin, Waseem Haider
Summary: Additive manufacturing of metallic alloys provides a new avenue to print objects with complex geometries and improved microstructures, impacting their mechanical and corrosion properties. Processing parameters such as laser power and scanning speed significantly influence the microstructure of alloys. Heat treatment can affect the corrosion resistance and mechanical properties of the alloys in different ways.
CRITICAL REVIEWS IN SOLID STATE AND MATERIALS SCIENCES
(2022)
Article
Materials Science, Multidisciplinary
M. Sabbaghian, R. Mahmudi, K. S. Shin
Summary: The study investigated the effect of adding 1 wt pct Gd on the microstructural evolution, mechanical properties and bio-corrosion behavior of a biodegradable Mg-4Zn alloy. The addition of Gd resulted in finer grain size, enhanced textural hardening, and significantly improved mechanical properties. Electron backscattered diffraction analysis showed higher pitting susceptibility in the corroded surfaces of the Gd-containing alloy.
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
(2021)
