Article
Metallurgy & Metallurgical Engineering
I Vysotskiy, K. Kim, S. Malopheyev, S. Mironov, R. Kaibyshev
Summary: This study aimed to improve the superplastic ductility of friction-stir welded joints of ultrafine-grained (UFG) Al-Mg-Sc-Zr alloy. The UFG material was produced at elevated temperature to suppress abnormal grain growth, but the new approach resulted in a high fraction of low-angle boundaries, hindering grain-boundary sliding. Thus, superplastic deformation was primarily concentrated in the fully-recrystallized stir zone.
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
(2022)
Article
Chemistry, Physical
Y. D. Wang, F. C. Liu, P. Xue, H. Zhang, L. H. Wu, D. R. Ni, B. L. Xiao, Z. Y. Ma
Summary: This study comparatively investigates the thermal stability behaviors of ultrafine-grained Cu-Cr-Zr alloy processed by friction stir processing (FSP) and cold rolling (CR) methods, by comparing with pure copper. The precipitates in the Cu-Cr-Zr samples stabilized the deformed microstructures and played a role in the thermal stability. The differences in thermal stability caused by different stored energy were masked by the kinetic constraint of precipitates.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Multidisciplinary
Ivan S. Zuiko, Sergey Malopheyev, Sergey Mironov, Sergey Betsofen, Rustam Kaibyshev
Summary: The macro-scale distribution of secondary precipitates in friction-stir-welded 2519 aluminium alloy was found to vary within the stir zone due to local variations in welding temperature and cooling rate. Precipitation coarsening was most pronounced at the weld root, while dissolution was enhanced at the upper weld surface. Reprecipitation phenomena were most prominent in the weld nugget.
Article
Materials Science, Multidisciplinary
S. Ya. Betsofen, I. S. Zuiko, R. O. Kaibyshev, M. I. Gordeeva
Summary: A new X-ray approach was used to quantify second-phase precipitates in friction-stir welded 2519-T820 aluminum alloy. The stir zone material was found to contain a significant fraction of non-equilibrium theta' and theta '' phases. Based on this result, it was concluded that the widely accepted concept of FSW-induced precipitation phenomena is oversimplified and requires revision.
Article
Materials Science, Multidisciplinary
Yuexin Zhou, Hanqing Xiong, Yun Zhang, Charlie Kong, Hailiang Yu
Summary: High-speed underwater friction stir welding (UFSW) was used to weld cryo-and warm-rolled ultrafine-grained AA2024 aluminum alloy sheets composed of high-density nano metastable phase S ' and conventional coarse-grained AA2024-T4 ultra-thin sheets composed of high-density GPB zones. The microstructure of the welded joints was characterized using various techniques, and the results showed that substituting the advancing side (AS) with ultrafine-grained material significantly improved the strength and plasticity of the joint, providing a promising method for low-cost and high-strength connection of aluminum sheets.
MATERIALS CHARACTERIZATION
(2023)
Article
Materials Science, Multidisciplinary
I Vysotskii, S. Malopheyev, S. Mironov, R. Kaibyshev
Summary: Low-temperature friction-stir welding is successfully used for joining ultrafine-grained Al-Mg-Mn alloy, preserving the microstructure and second-phase particles, and achieving nearly-100% joint efficiency. The deformation behavior and strengthening mechanisms of the welded joints are studied.
MATERIALS CHARACTERIZATION
(2022)
Review
Materials Science, Multidisciplinary
Francisco B. Ferreira, Igor Felice, Isaque Brito, Joao Pedro Oliveira, Telmo Santos
Summary: Friction stir welding is widely used in various industries, and its variant, orbital friction stir welding, is particularly important in fundamental industries like oil and gas and aerospace. The development of new process parameters, tools, and ancillary mechanisms is necessary to ensure high-quality joints. This review assesses the current state of orbital friction stir welding and discusses key aspects of this technology.
Article
Engineering, Mechanical
Avinish Tiwari, Pardeep Pankaj, Pankaj Biswas, Arvind Kumar
Summary: In this study, cemented carbides with different cobalt content were developed using medium and ultrafine tungsten carbide grains. A small amount (0.5 wt. %) of (Cr3C2) was added to restrict grain growth. The effects of particle size, reinforcement content, and sintering temperature on metallography, densification, and mechanical properties were investigated. The developed tool was able to join 4 mm thick high strength low alloy steel plates without severe wear and degradation. However, tool oxidation and interface degradation were observed due to extreme tribological welding conditions.
TRIBOLOGY INTERNATIONAL
(2023)
Article
Materials Science, Multidisciplinary
Yijun Li, Jinghua Zhang, Ruidong Fu, Junhao Wang, Hongyan Lv, Haizhi Xing
Summary: The effects of prestrain-assisted friction stir processing and subsequent aging heat treatment on the microstructural evolution and performance of copper-chromium-zirconium alloys were investigated. The study found that prestrain, generated through cold rolling before friction stir processing, significantly influenced grain refinement and improved the mechanical properties and electrical conductivity in the processing zone. The prestrain reduced the activation energy of dynamic restoration and precipitation in the processing zone and strengthened the constraint effect of the base metals. This resulted in reduced width of micro-bands and promoted nanocrystalline formation. Furthermore, dynamic precipitation increased the thermal stability of the microstructure in the processing zone during aging heat treatment. Therefore, a synergistic improvement of the mechanical properties and electrical conductivity of copperchromium-zirconium alloys was achieved.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Nanoscience & Nanotechnology
Wei Guan, Yanhua Zhao, Yongchang Liu, Su Kang, Dongpo Wang, Lei Cui
Summary: This study proposes a strategy for developing force-data-driven machine learning models to predict defects in friction stir welding. The characteristics of the three component forces (F-x, F-y, and F-Z) are studied and it is found that F-yavg has the best correlation with tunnel defects.
SCRIPTA MATERIALIA
(2022)
Article
Nanoscience & Nanotechnology
G. H. Li, L. Zhou, H. F. Zhang, G. Z. Guo, S. F. Luo, N. Guo
Summary: The study revealed that the evolution of grain structure in magnesium alloy welding is complex, with significant texture variation and weak grain-size dependence in microhardness distribution. The transverse tensile elongation of the joint is lower than that of the parent metal, possibly due to strain localization in the thermo-mechanically affected zone/weld nugget zone interface region.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Automation & Control Systems
Andro Sidhom, Soheir Naga, Ahmed Kamal
Summary: This study investigates the possibility of friction stir spot welding of dissimilar polycarbonate to high-density polyethylene. The results show that an effective weld can be achieved at a moderate frictional heating temperature between the melting temperature T-m and glass transition temperature T-g of both materials.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2022)
Article
Materials Science, Multidisciplinary
Pingqiang Gao, Yan Zhang, Kush P. Mehta
Summary: The dissimilar joints of AA5083 and pure Cu were successfully produced and compared using friction stir spot welding and modified friction stir clinching with the intermediate layer of Zn interlayer for the first time. The presence of lamellar eutectics in the brazed zone and intermetallic compounds in the weld zone were confirmed in Cu-Al MFSC joints.
METALS AND MATERIALS INTERNATIONAL
(2021)
Review
Engineering, Mechanical
Dhanesh G. Mohan, ChuanSong Wu
Summary: Friction Stir Welding (FSW) is a promising solid-state metal joining method that produces joints with higher mechanical and corrosion resistance properties compared to traditional fusion welding methods; FSW has made significant progress in steel welding, eliminating unfavorable phase transformations and reducing the heat-affected zone, leading to excellent mechanical properties of the joints.
CHINESE JOURNAL OF MECHANICAL ENGINEERING
(2021)
Article
Chemistry, Multidisciplinary
Miguel A. R. Pereira, Ivan Galvao, Jose Domingos Costa, Ana M. Amaro, Rui M. Leal
Summary: The objective of this paper is to demonstrate the potential of friction stir welding and its variants in joining fiber-reinforced thermoplastic polymer composites. The influence of welding parameters and methods to reduce defects are discussed.
APPLIED SCIENCES-BASEL
(2022)
Article
Metallurgy & Metallurgical Engineering
X. S. Yang, L. Zhou, K. Y. Liu, Z. Y. Liu, Q. Z. Wang, B. L. Xiao, Z. Y. Ma
Summary: The effective thermal conductivity of graphene nanoplatelet (GNP)/Al composites is influenced by factors such as the shape, aspect ratio, configuration, and volume fraction of GNPs. The study found that composites with elliptic GNPs have the highest thermal conductivity, increasing the aspect ratio of GNPs leads to an increase in thermal conductivity, and composites with layered GNPs have the highest thermal conductivity among different configurations. Additionally, the thermal conductivity is sensitive to the volume fraction of GNPs, reaching a high value when the volume fraction of layered GNPs is 1.54%.
ACTA METALLURGICA SINICA-ENGLISH LETTERS
(2022)
Article
Thermodynamics
L. Zhou, T. B. Yuan, X. S. Yang, Z. Y. Liu, Q. Z. Wang, B. L. Xiao, Z. Y. Ma
Summary: This study investigated the influence of CNT configuration, heat transfer direction, interfacial thermal resistance, and volume fraction on the effective thermal conductivity of CNT/Al composites using a 3D multiscale finite element model. The results showed that the CNT configuration played a major role in determining the thermal conductivity, with the layered configuration exhibiting the highest thermal conductivity. Additionally, the composite displayed an excellent effective thermal conductivity of 400 W/m.K when the volume fraction of CNTs was about 3.7%.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2022)
Article
Nanoscience & Nanotechnology
Z. L. Wang, Z. Zhang, P. Xue, D. R. Ni, Z. Y. Ma, Y. F. Hao, Y. H. Zhao, G. Q. Wang
Summary: The study found that lower welding speeds in BT-FSW result in microvoid defects in the band pattern structure on the RS of the NZ, which decrease in size with increasing welding speed, while sound joints are obtained under higher speeds. Microvoid defects exhibit an obvious effect on tensile deformation and fracture behavior of joints, with cracks initiating from these defects in the nugget zones.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Engineering, Mechanical
J. F. Zhang, X. X. Zhang, Z. Y. Liu, Q. Z. Wang, B. L. Xiao, Z. Y. Ma
Summary: A new RVE builder is developed to solve the strong framing effect problem and construct CNT/Al RVEs with high volume fractions and complex geometries using rigid body dynamics simulation. Uniaxial tensile tests are simulated on the RVEs with random/aligned CNTs and three volume fractions, and the load transfer strengthening mechanism of CNT/Al is studied. The simulation results match well with experimental results.
INTERNATIONAL JOURNAL OF MECHANICS AND MATERIALS IN DESIGN
(2022)
Article
Materials Science, Multidisciplinary
Z. W. Wang, M. Liu, H. Zhang, G. M. Xie, P. Xue, L. H. Wu, Z. Zhang, D. R. Ni, B. L. Xiao, Z. Y. Ma
Summary: This study compared the structure-property relationships of Q&P 1180 steel joints welded by laser welding, TIG welding, and friction stir welding. The results showed that laser welding and friction stir welding achieved excellent tensile strength comparable to the parent metal while maintaining material hardness, whereas TIG welding resulted in significant softening and strength loss.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Engineering, Multidisciplinary
P. Y. Li, X. N. Li, Z. Y. Liu, L. Q. Chen, B. L. Xiao, Z. Y. Ma
Summary: The study found that laminate carbon nanotube (CNT)/Al-Cu-Mg composites showed significantly improved strength-ductility due to the mechanical incompatibility between ductile and brittle layers, which produced a large number of geometrically necessary dislocations (GNDs) inhibiting strain localization. Use of ultrafine grain Al as ductile layers further increased strength by 14% compared to coarse grain Al, showcasing better coordination with the brittle layers.
COMPOSITES PART B-ENGINEERING
(2022)
Article
Engineering, Industrial
Y. Q. Wang, R. H. Duan, J. Hu, Z. A. Luo, Z. Y. Ma, G. M. Xie
Summary: This study successfully improved the toughness and ductility of medium-Mn steel joints through friction stir welding and intercritical annealing. The as-annealed joints exhibited higher impact energy and elongation, which can be attributed to the high proportion of high angle boundaries and a large amount of ultra-fine reversed austenite.
JOURNAL OF MATERIALS PROCESSING TECHNOLOGY
(2022)
Article
Materials Science, Multidisciplinary
C. L. Jia, L. H. Wu, P. Xue, H. Zhang, D. R. Ni, B. L. Xiao, Z. Y. Ma
Summary: The study achieved static spheroidization of fine lamellar structures in the nugget of a friction stir welded Ti-6Al-4V joint. A new mechanism named termination coalescence was discovered, where adjacent lamellae gradually coalesce. The study also discusses the slower coarsening rate in lamellar structures compared to equiaxed structures due to a Burgers orientation relationship.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2022)
Article
Metallurgy & Metallurgical Engineering
Z. Y. Dong, D. Wang, W. G. Wang, B. L. Xiao, Z. Y. Ma
Summary: Tungsten carbide (WC) nanocoatings on the surface of diamond particles were prepared using sol-gel and in-situ reaction methods to enhance interface bonding with aluminum. The thermal conductivity of the diamond/Al composite was improved by the nanocoatings, with different results depending on the concentration of the sol-gel used.
ACTA METALLURGICA SINICA-ENGLISH LETTERS
(2023)
Article
Metallurgy & Metallurgical Engineering
Zhenlin Wang, Beibei Wang, Zhen Zhang, Peng Xue, Yunfei Hao, Yanhua Zhao, Dingrui Ni, Guoqing Wang, Zongyi Ma
Summary: In this study, the effect of welding speeds on the fatigue properties of bobbin tool friction stir welding (BT-FSW) joints was analyzed using 2219-T87 Al alloy plates. The results showed that the high-cycle fatigue performance of the BT-FSW joints was significantly enhanced at higher welding speeds. Moreover, the location of failure in the joints varied depending on the welding speed.
ACTA METALLURGICA SINICA-ENGLISH LETTERS
(2023)
Article
Materials Science, Multidisciplinary
Xinpeng Guo, Huijun Li, Peng Xue, Zengxi Pan, Rongzheng Xu, Dingrui Ni, Zongyi Ma
Summary: In recent years, progress has been made in the utilization of wire-arc additive manufacturing (WAAM) technology for the preparation of Al-Zn-Mg-Cu aluminum alloy. However, achieving ultra-high strength (600 MPa) in WAAM remains a challenge. In this study, a crack-free Al-Zn-Mg-Cu-Sc thin-wall component with ultra-high strength was successfully fabricated using the cold metal transfer (CMT) process. The tensile strength reached a recorded level of 618 MPa after heat treatment.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2023)
Article
Materials Science, Composites
P. Y. Li, X. N. Li, K. Ma, F. C. Liu, Z. Y. Liu, L. Q. Chen, B. L. Xiao, Z. Y. Ma
Summary: A bioinspired tree-ring structure consisting of alternated ductile layers and brittle layers was designed and fabricated to improve the strength-ductility of CNT/Al composites. The results showed higher strength and elongation in the tree-ring composite compared to the uniform composite, indicating the potential for enhancing the mechanical properties of composites.
COMPOSITES COMMUNICATIONS
(2023)
Article
Engineering, Multidisciplinary
Youdao Wang, Yifan Zhao
Summary: This paper proposes a three-stage feature selection approach for deep learning-based RUL prediction models to address the limitation of current methods for data under multiple operating conditions. The proposed method involves using k-medoids clustering, operational-based normalization, and Spearman's rank and pair-wise Pearson correlation coefficients for feature selection. A case study using NASA's C-MAPSS dataset shows that the proposed method improves the stability and achieves an average improvement of about 7.3% in RUL prediction for popular and state-of-the-art deep learning models.
QUALITY AND RELIABILITY ENGINEERING INTERNATIONAL
(2023)
Article
Materials Science, Composites
Z. Y. Dong, X. Y. Liu, D. Wang, W. G. Wang, B. L. Xiao, Z. Y. Ma
Summary: A 20 nm SiC nanocoating was prepared on crushed diamond particles using sol-gel and in situ reaction methods. The 50 vol% SiC-coated diamond particles reinforced 6061Al composites were fabricated by vacuum hot pressing. The composite showed improved interfacial thermal conductance due to the presence of SiC at the diamond-Al interface, resulting in a high thermal conductivity of 485 W/mK.
COMPOSITES COMMUNICATIONS
(2023)
Article
Materials Science, Multidisciplinary
Xu Tang, Hao Zhang, Zhengwang Zhu, Peng Xue, Lihui Wu, Fengchao Liu, Dingrui Ni, Bolv Xiao, Zongyi Ma
Summary: By adjusting the process parameters of laser powder bed fusion (LPBF), near fully dense AlCoCrFeNi2.1 samples were obtained, and laser remelting was selected as an optimized scanning strategy to further improve the forming quality. The microstructure of the samples exhibited regular eutectic lamellae consisting of nano-scale face-centered-cubic (FCC) and B2 phases, resulting in improved strength and performance compared to traditional methods.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2023)
