Article
Chemistry, Physical
Wenyan Zhang, Yuqing Mao, Ping Yang, Ning Li, Liming Ke, Yu Chen
Summary: This study investigates the effect of welding speed on the microstructure evolution and mechanical properties of friction stir welded Al-Cu-Li alloys. The results show that, with decreasing welding speed, the size of the nugget zone initially increases and then decreases. At a welding speed of 150 mm/min, the joints exhibit the largest nugget zone and finer equiaxed grains. These joints have the highest tensile properties, but the properties are still lower compared to the base material.
Article
Materials Science, Multidisciplinary
Peng Chen, Siqi Zou, Jing Chen, Siyi Qin, Qingbo Yang, Zhiqing Zhang, Zhihong Jia, Ling Zhang, Ting Jiang, Qing Liu
Summary: This study investigated the microstructure evolution and mechanical properties of SIZ, PIZ, and SZ regions during friction stir welding with different rotation speeds. The results showed that the grains and orientation in different regions varied, as well as the strengthening mechanisms.
MATERIALS CHARACTERIZATION
(2021)
Article
Metallurgy & Metallurgical Engineering
Wang Dong-yao, Zhan Li-hua, Zhong Jue, Tang Zhi-mao, Zeng Quan-qing, Gan Ke-fu
Summary: This study systematically investigated the creep ageing behaviors and underlying microstructure evolution of a thick friction-stir welded Al-Cu alloy plate after CAF process under different stress levels. The results demonstrate that increasing the initial dislocation density can improve the tensile properties and promote the creep deformation during the CAF process.
JOURNAL OF CENTRAL SOUTH UNIVERSITY
(2022)
Review
Engineering, Manufacturing
Yue Yang, Jing Bi, Hanwei Liu, Yang Li, Mingyang Li, Sansan Ao, Zhen Luo
Summary: Aluminum-lithium (Al-Li) alloys welding has been an important topic in the fields of aerospace and military. This study analyzed the research status of Al-Li alloy welding worldwide using bibliometrics. Friction stir welding (FSW) was identified as the major method for Al-Li alloys welding. The process characterization and microstructure evolution of Al-Li alloys FSW were reviewed in detail. The influence of process parameters on the microstructure and mechanical properties of the friction stir welded joints were analyzed and summarized. The study also provided suggestions for future research directions in Al-Li alloy FSW.
JOURNAL OF MANUFACTURING PROCESSES
(2022)
Article
Engineering, Mechanical
Zhikang Shen, Yuquan Ding, Wei Guo, Wentao Hou, Xiaochao Liu, Haiyan Chen, Fenjun Liu, Wenya Li, Adrian Gerlich
Summary: Refill friction stir spot welding (refill FSSW) has been shown to significantly improve weld strength in Al alloy to copper joints, with two types of continuous and ultra-thin intermetallic compounds (IMCs) layers identified at the interface. The peak temperature reached 591 degrees C, with evidence of melting and resolidification observed, showing the potential for industrial applications.
CHINESE JOURNAL OF MECHANICAL ENGINEERING
(2021)
Article
Materials Science, Multidisciplinary
Z. Shen, S. Chen, L. Cui, D. Li, X. Liu, W. Hou, H. Chen, Z. Sun, W. Y. Li
Summary: The present investigation focuses on the localized microstructure evolution and mechanical performance of friction stir additive manufactured (FSAM) 2195 Al-Li alloy. Optical microscope, electron back scattered diffraction, and transmission electron microscopy techniques were used to characterize the microstructure, while microhardness and tensile testing measurements were conducted to evaluate the mechanical properties. The results showed that a multilayered stack of 2195 aluminum lithium alloy was successfully fabricated using FSAM, with fine equiaxed grains observed in the nugget zone. The mechanical properties were influenced by the distribution of precipitation phases and the size of grain boundaries.
MATERIALS CHARACTERIZATION
(2022)
Article
Materials Science, Multidisciplinary
Nan Xu, Zike Ren, Zhengda Lu, Jun Shen, Qining Song, Jianhua Zhao, Yefeng Bao
Summary: Friction stir welding (FSW) is a commonly used technology for joining low melting point metals or alloys. In this study, large-load and low-speed FSW was used to improve the welding efficiency of an AZ61 Mg alloy, resulting in an ultrafine grain structure and enhanced strength and ductility of the welded joint.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Automation & Control Systems
Wentao Hou, Yuquan Ding, Guoqiang Huang, Nazmul Huda, Luqman Hakim Ahmad Shah, Zhongyu Piao, Yifu Shen, Zhikang Shen, Adrian Gerlich
Summary: The study introduced eccentric motion by offsetting the pin from the tool shoulder in order to enhance material flow and grain refinement in the stir zone during friction stir welding of Al-Mg-Si aluminum alloy plates. The results showed that pin eccentricity had a positive effect on promoting material flow and grain refinement, as well as enhancing the toughness of the weld joint.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2022)
Article
Materials Science, Multidisciplinary
Rasoul Khajeh, Hamid Reza Jafarian, Seyed Hossein Seyedein, Reza Jabraeili, Ali Reza Eivani, Nokeun Park, Yejin Kim, Akbar Heidarzadeh
Summary: The study investigated the effect of FSW parameters on the properties of 2024 aluminum alloy and copper joints, finding that the W/V ratio plays a significant role in determining the joints' characteristics. Optimal FSW conditions led to higher strength and ductility, as well as lower electrical resistivity.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2021)
Article
Chemistry, Physical
Iuliia Morozova, Aleksei Obrosov, Anton Naumov, Aleksandra Krolicka, Iurii Golubev, Dmitry O. Bokov, Nikolay Doynov, Sabine Weiss, Vesselin Michailov
Summary: The study utilized Impulse Friction Stir Welding (IFSW) to join 6082-T6 alloy plates at different impulse frequencies. It was found that reprecipitation of strengthening beta '' precipitates occurred in the Stir Zone (SZ) of IFSW joints during natural aging. The introduction of impulses may have accelerated the precipitation kinetics due to a more developed subgrain network and higher dislocation density.
Article
Materials Science, Multidisciplinary
Pouyan Talebizadehsardari, Farayi Musharavati, Afrasyab Khan, Tamer A. Sebaey, Arameh Eyvaziana, Hamed Aghajani Derazkola
Summary: The aim of this study was to analyze the material behavior during underwater friction stir welding of Al-Mg alloy using a thermo-mechanical model. The results showed that underwater welding can improve joint hardness and tensile properties to some extent. Compared with conventional friction stir welding, the smaller preheated area at the leading edge in underwater friction stir welding led to a decrease in total amount of frictional heat generation.
MATERIALS TODAY COMMUNICATIONS
(2021)
Article
Materials Science, Multidisciplinary
Dong Wu, Wenya Li, Xichang Liu, Yanjun Gao, Quan Wen, Achilles Vairis
Summary: The microstructure and mechanical properties of joints between Al-Cu and Al-Mg aluminum alloys using bobbin tool friction stir welding were studied. Results showed that different material configurations and welding speeds had an impact on the performance of the joints, and the hardness distribution exhibited distinctive characteristics.
MATERIALS CHARACTERIZATION
(2021)
Article
Materials Science, Multidisciplinary
Li Liu, Yunqiang Zhao, Jiantang Jiang, Zhe Liu, Shu Miao, Zhicheng Lin, Chungui Wang, Chunlin Dong, Liang Zhen
Summary: An Al-Zn-Mg-Sc-Zr alloy with high Zn was prepared to achieve ultra-high strength. The study found that the ultra-high strength was mainly attributed to precipitate strengthening, solid solution strengthening, and fine grain strengthening. Soft regions were developed near the interfaces between the heat-affected zone and thermo-mechanically affected zone. Fine recrystallized grains were formed in the nugget zone.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Nanoscience & Nanotechnology
Dongyao Wang, Lihua Zhan, Chunhui Liu, Diqiu He, Ruilin Lai, Yidi Li, Quanqing Zeng, Minghui Huang, Shengmeng Hui
Summary: This study systematically investigates the creep response and microstructure evolution of the nugget zone of a friction stir welded Al-Cu-Li alloy under different stress levels. It is found that the creep strain and rate of the nugget zone increase rapidly with increasing stress, and its total creep strain is significantly higher than the base material under the same stress. The creep mechanism of the nugget zone changes from diffusion creep to dislocation climbing creep with increasing stress.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Nanoscience & Nanotechnology
Lei Shi, Xiang Dai, Chunyan Tian, Chuansong Wu
Summary: A novel splat cooling assisted friction stir welding (SCaFSW) was proposed to achieve high-strength joints of 2195 Al-Li alloy. The use of splat cooling in friction stir welding reduced the welding temperature and fluidity of the plastic materials, resulting in a rough weld surface and even the formation of void defects. Compared to conventional FSW, the SCaFSW joint had finer grain size and higher dislocation density in the weld nugget zone. Splat cooling suppressed the dissolution of precipitates into the matrix and resulted in coarse residual precipitates in the weld nugget zone of SCaFSW joints. Additionally, splat cooling significantly increased the tensile strength but decreased the elongation of defect-free 2195 Al-Li alloy joints.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
