Article
Materials Science, Multidisciplinary
Ju Kang, Mingyu Si, Jiajian Wang, Li Zhou, Xiangdong Jiao, Aiping Wu
Summary: The FSW repair technique was used to repair the cavity defects in the single-pass FSW of 2219-T8 aluminum alloy. The evolution of precipitates and its effect on the mechanical and corrosive properties of the repaired joint were studied. The repair welding successfully eliminated the void defects, but led to a larger precipitate-free zone and more severe intergranular corrosion.
MATERIALS CHARACTERIZATION
(2023)
Article
Materials Science, Multidisciplinary
Xiangfeng Du, Tong Xi, Chunguang Yang, Hanyu Zhao, Ke Yang
Summary: The effect of copper (Cu) addition on the static recrystallization behavior of large deformed 316L austenitic stainless steel is investigated in this study. The results show that Cu addition can retard the annealing softening process and increase the recrystallization activation energy. Transmission electron microscope (TEM) images reveal that Cu-rich precipitates preferentially distribute at the interface between the recrystallized grain and deformation region, hindering the migration of grain boundaries and delaying the recrystallization process.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Engineering, Mechanical
V. K. Yadav, V. Gaur, I. V. Singh
Summary: The corrosion-fatigue behavior of friction stir welded AA2024-T3 in a 3.5% NaCl solution was investigated. Corrosion-damage analysis revealed that the heat-affected zone in the shoulder-affected region was more susceptible to corrosion attack due to microstructural coarsening. A mechanism was proposed for the microstructural evolution in the shoulder-affected zone. A significant reduction in the fatigue life of the welded component was observed in the 3.5% NaCl solution compared to laboratory air, attributed to pit formation caused by the dissolution of Al-matrix near intermetallic particles.
INTERNATIONAL JOURNAL OF FATIGUE
(2023)
Article
Materials Science, Multidisciplinary
Lu Wen, Wencai Liu, Guohua Wu, Henglong Wu, Liang Zhang, Jiangwei Sun, Jinshuo Zhang, Shihao Xu, Chunchang Shi, Yongbo Wang, Yejun Lu
Summary: The addition of 0.15 wt% Cr can improve the comprehensive performance of the Al-6.5Zn-2Cu-1.5 Mg-0.05Ti alloy, reducing stress corrosion cracking susceptibility index by 82%, increasing elongation by 42%, with a slight decrease in strength.
MATERIALS CHARACTERIZATION
(2022)
Article
Materials Science, Multidisciplinary
Fujun Cao, Tianyang Jiang, Wentao Hou, Guoqiang Huang, Yifu Shen, Yuquan Ding, Ping Shu
Summary: The study investigated the inhomogeneous fiber structure and its effect on the mechanical behaviors of the SAF2507 SDSS FSW joint. The results showed that the FSW-induced thermomechanical effect led to changes in grain size and fiber structure direction. The grains of ferrite and austenite were refined throughout the stir zone, primarily governed by CDRX and DDRX mechanisms. In different regions of the stir zone, inhomogeneous fiber structures with various directions were created. The FSW joint exhibited higher yield strength, slightly lower ultimate tensile strength, and reduced fracture elongation compared to the base material. The higher yield strength could be attributed to grain refinement, while the fiber structures on the affected zone led to earlier crack initiation and propagation, accelerating fracture at the shoulder affected zone.
MATERIALS CHEMISTRY AND PHYSICS
(2022)
Article
Materials Science, Multidisciplinary
Zhi Jia, Xuan Sun, Jinjin Ji, Yanjiang Wang, Baolin Wei, Lidan Yu
Summary: The high-temperature compression deformation behavior of Inconel 625 alloy was investigated through hot compression tests, revealing that the optimum condition for plastic deformation is at temperatures higher than 1050 degrees C with a strain rate of 1 to 10 s(-1). The characterization of hot compression microstructure evolution using EBSD and TEM techniques showed different dynamic recrystallization mechanisms under varying compression deformation conditions, with CDRX dominating at lower temperatures and DDRX with a bulging boundary induced by twinning dominating at higher temperatures. These findings provide a theoretical basis for optimizing the thermoplastic processing of nickel-based superalloys.
ADVANCED ENGINEERING MATERIALS
(2021)
Article
Chemistry, Physical
Shizhou Wang, Chengbin Shi, Huai Zhang, Li Meng, Jing Li
Summary: The flow behavior, dynamic recrystallization, and microstructure evolution of a newly developed valve alloy were studied. Models were established to predict the flow behavior and DRX behavior, and the optimal processing parameters were determined. The Laves phase and (Ti,Nb)C particles hindered the dynamic recrystallization process, while fine gamma' particles provided nucleation sites for recrystallization.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Engineering, Manufacturing
Fujun Cao, Guoqiang Huang, Wei Guan, Wentao Hou, Ruiyang Ni, Yifu Shen, Qijun Liu
Summary: The study investigated the microstructural inhomogeneity along the thickness of the FSW joint and its impact on mechanical properties and corrosion resistance. It was found that temperature gradient and heterogeneous grain size and misorientation distributions existed in the SZ. The longitudinal tensile specimens from the middle part of the joint exhibited a good combination of strength and ductility due to a balanced microstructure with reasonable grain size.
JOURNAL OF MANUFACTURING PROCESSES
(2022)
Article
Nuclear Science & Technology
Kang Wang, Yan Li, Xiang Zan, Laima Luo, Jiaqin Liu, Yucheng Wu
Summary: The present work aims to characterize the heterogeneity in the through-thickness deformed microstructure of an yttria dispersion-strengthened tungsten plate and study its effect on recrystallization behavior. Topological maps of different regions were measured using electron backscatter diffraction, and grain size, GND energy, potential nuclei density, and texture distributions were analyzed. The results showed that the center layer of the tungsten plate has a larger subgrain size and more potential recrystallized nuclei, leading to preferential recrystallization in the center layer.
NUCLEAR MATERIALS AND ENERGY
(2023)
Article
Materials Science, Multidisciplinary
Hao Chen, Jianwei Tang, Weiwei Gong, Yunpeng Gao, Feng Tian, Liang Chen
Summary: Different annealing temperatures and holding times were found to have significant effects on the microstructure and corrosion rate of hot rolled AZ31 Mg sheets. Annealing at a high temperature of 450 degrees C and a long holding time of 5 hours effectively reduced the corrosion rate by increasing grain size and decreasing the presence of dislocations, twins, and second phase particles.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2021)
Article
Materials Science, Multidisciplinary
Shiqi Li, Qinghuan Huo, Sijia Hu, Chunyu Wang, Zhirou Zhang, Yuxiu Zhang, Tao Chen, Xuyue Yang
Summary: The effects of original orientations on the dynamic recrystallization behaviors of a hot-rolled Mg-1.0wt% Ca plate were investigated. It was found that dynamic recrystallization occurred more easily in the normal direction sample at the same temperature. As the temperature increased, the area fraction and size of the dynamic recrystallized grains improved faster in the rolling direction sample. The Mg-1.0wt%Ca alloy significantly postponed both the continuous and discontinuous dynamic recrystallization processes compared to commercial Mg alloys.
MATERIALS CHARACTERIZATION
(2023)
Article
Nanoscience & Nanotechnology
Hong-Min Zhang, Peng Jiang, Hai-Jun Pan, Jian Peng, Zhi-Zhi Wang, Ke-Tao Yan, Min Zha
Summary: This research reveals the high-temperature tensile properties and deformation mechanisms in simply extruded Al-7Mg alloys tailored by Sc/Zr ratios, specifically focusing on discontinuous dynamic recrystallization (DDRX). The bimodal-grained Al-7Mg-0.4Sc alloy exhibits superplastic behavior with a high elongation to failure of approximately 540% at 400°C and 5 x 10(-4) s(-1). However, this behavior is not observed in the coarse-grained Al-7Mg-0.1Sc-0.3Zr and Al-7Mg-0.3Sc0.1Zr alloys. The superplasticity in Al-7Mg-0.4Sc is achieved through a combination of grain boundary sliding (GBS) and dislocation slip as dominant mechanisms, accompanied by DDRX in the initial tensile deformation stage and dislocation slip-accommodated GBS in the late stage.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Materials Science, Multidisciplinary
Ya Tang, Daihong Xiao, Lanping Huang, Renxuan You, Xinyue Zhao, Nan Lin, Yunzhu Ma, Wensheng Liu
Summary: The study reveals that compression temperature significantly influences the characteristic and dynamic behavior of secondary phases in Al-Cu-Li alloy during hot deformation. Proper strain rates can accelerate the formation and growth of T-1 phase, but at higher temperatures, T-1 phase may completely dissolve into the matrix.
MATERIALS CHARACTERIZATION
(2022)
Article
Materials Science, Multidisciplinary
Ya Tang, Daihong Xiao, Lanping Huang, Renxuan You, Xinyue Zhao, Nan Lin, Yunzhu Ma, Wensheng Liu
Summary: In this study, the evolution of deformation microstructures and multiscale phases in Al-Cu-Li alloy was investigated under different temperatures and strain rates. The results showed that the compress temperature has an impact on the characteristic and dynamic deformation behaviors of secondary phases. Proper strain rates can promote the formation and growth of multistage banded T-1 phase.
MATERIALS CHARACTERIZATION
(2022)
Article
Materials Science, Multidisciplinary
Depeng Wang, Yifeng Li, Liang Xue, Jianchao Peng, Li Qiang, Meiyi Yao, Bangxin Zhou
Summary: Zirconium alloy is the only material currently used for fuel cladding in pressurized water reactors (PWRs), and its corrosion resistance is crucial for reactor safety and economy. This research compares different types of secondary phase precipitates (SPPs) in zirconium alloys and reviews the corrosion behaviors and factors influencing typical SPPs. The corrosion processes of principal alloying elements, such as iron and niobium, within binary and/or ternary SPPs are compared, and the effects of different water chemistry on SPP corrosion products and their influence on the corrosion behavior of zirconium alloy matrix are summarized. The deficiencies in current studies on SPP corrosion behavior are pointed out. Finally, the future research direction for SPP in zirconium alloy is discussed, emphasizing the use of advanced microstructure characterization methods to further study the corrosion mechanism of SPPs containing iron and/or niobium, which will provide theoretical support for the improvement of corrosion resistance in domestic novel zirconium cladding materials.
RARE METAL MATERIALS AND ENGINEERING
(2023)
Article
Materials Science, Multidisciplinary
Zhichao Shang, Xiaoping Cai, Farshid Pahlevani, Yan Zheng, Akbar Hojjati-Najafabadi, Xinran Gao, Baojing Zhang, Peizhong Feng
Summary: High porosity Co-Al-Fe intermetallics with 3D-microstructures were successfully synthesized in one step via a thermal explosion reaction. The link between pore structure and permeability was investigated using 3D-XRM technology. The corrosion resistance of the samples with different Fe contents was studied at 900 degrees C under an oxygen/sulphur atmosphere for up to 120 h. The results showed that the samples maintained stable pore structure and intact internal matrices, attributed to the formation of a thin protective layer on the surface. In addition, inward diffusion of S resulted in the formation of FeS nodules.
Article
Materials Science, Multidisciplinary
Lian Ma, Hain Yang, Daquan Zhang, Wei Wu
Summary: In this study, an environmentally friendly volatile corrosion inhibitor, lysine salts (LA), was prepared between graphene oxide (GO) layers using an in situ intercalation technique. The corrosion inhibition effect of LA was evaluated, and it was found that LA-GO2 achieved a 99.3% corrosion inhibition efficiency after composition optimization. The inhibition of the electrochemical anodic process on the surface of mild steel was the main reason for the high corrosion inhibition efficiency of LA-GO2. The properties of the surface film on the corroded steel were also characterized in detail to understand the corrosion inhibition mechanism of LA-GO2.
Article
Materials Science, Multidisciplinary
Running Wang, Jiaping Zhang, Bing Liu, Jie Fei, Qiangang Fu
Summary: By introducing a tailored SiC-C interphase, the carbon fiber can be effectively protected, improving the mechanical and ablation properties of leading edge shaped C/C-ZrC-SiC composites.
Article
Materials Science, Multidisciplinary
Zihua Wang, Chijia Wang, Ruitao Wang, Jiapeng Deng, Kun Zhang, Yanji Zhu, Huaiyuan Wang
Summary: A robust anti-corrosive coating has been developed using functional fly ash, which demonstrates excellent corrosion resistance and improved mechanical properties. The coating achieves these enhancements through molecular cross-linking design and surface augmentation techniques, resulting in a significantly improved impedance modulus compared to pure polyurea coatings.
Article
Materials Science, Multidisciplinary
Haofei Sun, Meifeng Li, Hao Zhang, Jing Liu
Summary: The oxidation behavior of FeCrNi medium entropy alloy was investigated through experimental observations and density functional theory (DFT) calculations. The study found that at 900 degrees C, the alloy forms a desirable and continuous oxide layer, while at 1000 degrees C, the oxide layer becomes discontinuous with penetration of oxide. These observations highlight the significant role of phase structure in promoting the formation of protective oxide scales and influencing oxidation resistance.
Article
Materials Science, Multidisciplinary
Yang Li, Ke Ma, Jingjun Xu, Jingjing Li, Yueming Li, Yi Zhang, Jun Zuo, Meishuan Li
Summary: Cr2AlC diffusion barrier effectively blocks the diffusion of Ti, enhancing the stability and spalling resistance of the Al2O3 scales between NiCrAlY coating and TiAl alloy.
Article
Materials Science, Multidisciplinary
Weiyi Wang, Qinglin Pan, Xiangdong Wang, Bing Liu
Summary: By adding Ce, Sc, Y and Zr elements to Al-Mg-Si alloy, the microstructure of the alloy can be regulated, and the corrosion and heat resistance of the materials can be improved.
Article
Materials Science, Multidisciplinary
Andrea Cristoforetti, Javier Izquierdo, Ricardo M. Souto, Flavio Deflorian, Michele Fedel, Stefano Rossi
Summary: This study presents a new approach to studying the mechanism of filiform corrosion in organic coated steel using the scanning vibrating electrode technique (SVET) and micropotentiometry (potentiometric SECM). The electrochemical activity under the coating was evaluated by mapping the ionic current densities coming from artificial defects made in specific locations of the filament. Antimony tips were also used to investigate the pH changes associated with different corrosion reactions at the metal-paint interface. Local pH levels along the filament in the anodic and cathodic regions were determined.
Article
Materials Science, Multidisciplinary
Yang Gao, Dayun Sun, Zhu Liu, Shuo Cong, Rui Tang, Yanping Huang, Lefu Zhang, Xianglong Guo
Summary: The corrosion characteristics of a novel alumina-forming austenitic steel in high-pressure high-temperature water environment were studied. The addition of aluminum has a negative effect on the continuity of the alumina scale.
Article
Materials Science, Multidisciplinary
Negin Madelat, Benny Wouters, Peter Visser, Zahra Jiryaeisharahi, Kristof Marcoen, Shoshan T. Abrahami, Annick Hubin, Herman Terryn, Tom Hauffman
Summary: This work explores the correlation between electrolyte transport properties and the variation of pigment volume concentration (PVC) in organic coatings. An odd random phase electrochemical impedance spectroscopy (ORP-EIS) approach is used to analyze the diffusion of ions independent from water uptake. The results show that a higher PVC leads to a more homogeneous coating structure, resulting in faster diffusion of ions and enhanced water uptake.
Article
Materials Science, Multidisciplinary
Eloa Lopes Maia, Serguei Gavrilov, Valentyn Tsisar, Kitty Baert, Iris De Graeve
Summary: The effect of pre-oxidation in air at 300-500°C on the initiation and development of liquid metal corrosion attack on 316L austenitic steel in static lead-bismuth eutectic (LBE) has been investigated. It was found that pre-formed oxide films can protect the surface against dissolution, while high temperature pre-oxidation leads to localized corrosion.
Article
Materials Science, Multidisciplinary
Baozhuang Sun, Qiuyu Wang, Yue Pan, Zhiyong Liu, Cuiwei Du, Xiaogang Li
Summary: In this study, a non-steady electrochemical model was established to investigate stress corrosion cracking (SCC). The model was verified using 304 SS with various microstructures, confirming its effectiveness in assessing SCC susceptibility.
Article
Materials Science, Multidisciplinary
Xingyu Xiao, Xinhua Liu, Zhilei Wang, Xuexu Xu, Mingying Chen, Jianxin Xie
Summary: The corrosion behavior and mechanisms of Cu-10Ni-X (Al, Fe, Mn, Cr, Sn, Ti, Zn) alloys in a 3.5% NaCl solution were systematically investigated. Both computational and experimental results revealed that except Ti, other elements could enhance the corrosion resistance of Cu2O passivation film.
Article
Materials Science, Multidisciplinary
Gen Zhang, Yan-Ping Huang, E. Jiang, Wei -Wei Liu, Hong Yang, Jing Xiong, Yong-Fu Zhao
Summary: The addition of aluminum has a significant influence on the intermetallic compounds in AFA alloys, particularly increasing the content of B2-NiAl phase. In the SCO2 environment, the oxide scales formed on AFA alloys with aluminum were thinner than on ASS without aluminum, and the structure of the oxide scales changed to a double-layer structure.
Article
Materials Science, Multidisciplinary
Yuxuan He, Guozheng Xiao, Chao Wang, Xuefeng Lu, Liuyuan Li, Shiying Liu, Yusheng Wu, Zhanjie Wang
Summary: The relationship between configurational entropy and lattice distortion in novel rare earth monosilicates was investigated, and the effect of configurational entropy on their properties was studied. The results showed that lattice distortion increased with the increase of configurational entropy, but a highly symmetrical crystal structure was formed when the configurational entropy was large enough, inhibiting the lattice distortion.