Article
Materials Science, Multidisciplinary
G. Moeini, S. Sajadifar, T. Wegener, C. Roessler, A. Gerber, S. Boehm, T. Niendorf
Summary: This study investigated the friction stir welding of additive manufactured components, analyzing the microstructural and mechanical property changes in the friction stir zone. Different build orientations had a significant impact on the tensile strength of the welded joints. Under low-cycle fatigue conditions, parts with building direction parallel to the loading direction showed superior fatigue performance.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2021)
Article
Engineering, Manufacturing
Mrinal Dwivedi, Alessia Teresa Silvestri, Stefania Franchitti, Hariharan Krishnaswamy, Arunachalam Narayanaperumal, Antonello Astarita
Summary: Hybrid additive manufacturing that combines bulk components from traditional manufacturing processes can overcome size limitations in typical metal additive processes. Investigation of the joining process between bulk and additive components is crucial in hybrid processes. A comprehensive study involving experiments and simulations was carried out to describe the linear friction welding of electron beam melted Ti6Al4V, with successful weld joints achieved in different welding configurations. The mechanical behavior and phase transformation in the weld region is highly influenced by the base material microstructure, and thermo-mechanical behavior during friction welding was successfully simulated using finite element method. The temperature history predicted with high accuracy in all configurations, and the experimental data along with simulation results were used to further explain and understand the phenomena occurring during welding.
CIRP JOURNAL OF MANUFACTURING SCIENCE AND TECHNOLOGY
(2021)
Review
Materials Science, Composites
Bala Murali Nagarajan, Manikandan Manoharan
Summary: This article provides a detailed discussion of the bonding mechanism of hybrid joints between metal and polymers. It covers various welding processes such as friction stir welding, friction stir spot joining, friction riveting, laser welding, ultrasonic welding, and induction welding. The defects and mechanical properties are analyzed, and the microstructure of different hybrid joints is reviewed.
JOURNAL OF THERMOPLASTIC COMPOSITE MATERIALS
(2023)
Article
Chemistry, Physical
Hamed Ghadimi, Huan Ding, Selami Emanet, Mojtaba Talachian, Chase Cox, Michael Eller, Shengmin Guo
Summary: The study uses the solid-state additive friction stir deposition (AFSD) process to fabricate Al-Cu-Li 2050 alloy parts. The hardness distribution of the as-fabricated parts is unique due to the variations in the processing temperature profile. XRD results show the presence of secondary phases, and EDS mapping confirms the formation of alloying particles in the deposited matrix. The AFSD thermal-mechanical process results in a unique hardness distribution and reduced microhardness level in the components compared to the feedstock material.
Article
Materials Science, Multidisciplinary
M. Liu, X. H. An, B. B. Wang, F. C. Liu, L. H. Wu, P. Xue, D. R. Ni, B. L. Xian, Z. Y. Ma
Summary: This study successfully fabricated large-scale ultrafine-grained (UFG) pure copper using the water-cooling assisted friction stir additive manufacturing (FSAM) method and examined its high cycle fatigue (HCF) properties. The microstructural characteristics of FSAM Cu remained stable during HCF deformation, resulting in a fatigue strength of 130 MPa and a fatigue ratio of 0.30, similar to coarse-grained Cu. This study provides an efficient method to produce large-scale bulk materials with high fatigue resistance, opening up possibilities for the engineering application of UFG materials.
Article
Materials Science, Multidisciplinary
M. Krochmal, A. Nammalvar Raja Rajan, G. Moeini, S. V. Sajadifar, T. Wegener, T. Niendorf
Summary: Welding and joining of hybrid components, consisting of additively manufactured (AM) parts and conventionally processed parts, can be achieved with the friction stir welding (FSW) process. The strength of dissimilar welded joints is influenced by the original casting material. Cast materials perform slightly better than hybrid AM-cast materials in fatigue testing, possibly due to more pronounced strain inhomogeneities in the hybrid materials. FSW can be used to fabricate large parts with cost reduction, by placing the AM as-built material in the region requiring superior cyclic load-bearing capacity.
JOURNAL OF MATERIALS RESEARCH
(2023)
Article
Materials Science, Multidisciplinary
S. Wlodarski, D. Z. Avery, B. C. White, C. J. T. Mason, C. Cleek, M. B. Williams, P. G. Allison, J. B. Jordon
Summary: This study investigated the grain refinement and mechanical properties of Mg Alloy through additive friction stir layer welding (AFSLW), demonstrating the ability to produce tall structures free of defects. Although the AFSLW material had lower strength compared to wrought Mg AZ31-H24, it still achieved defect-free builds with predictable mechanical properties. Metallography and fractography analysis confirmed the reliability of the AFSLW process for large structural applications.
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
(2021)
Article
Materials Science, Multidisciplinary
Priyanshi Agrawal, Ravi Sankar Haridas, Surekha Yadav, Saket Thapliyal, Abhijeet Dhal, Rajiv S. Mishra
Summary: The solid state nature of the AFSD additive manufacturing process provides advantages in terms of defect formation and microstructural refinement. This study investigates the process optimization, microstructural evolution, and recrystallization kinetics of AFSD deposited SS316. The as-deposited microstructure consists of equiaxed ultrafine grains, with an average grain size of around 5.0 +/- 0.5 μm. The observed necklace-type microstructure is attributed to discontinuous dynamic recrystallization during processing. The recrystallization kinetics of AFSD SS316 are characterized using the JMAK model.
MATERIALS CHARACTERIZATION
(2023)
Article
Chemistry, Physical
Janusz Torzewski, Magdalena Lazinska, Krzysztof Grzelak, Ireneusz Szachogluchowicz, Janusz Mierzynski
Summary: The present paper analyzes the influence of process parameters on the macrostructure, microhardness, and mechanical properties of dissimilar friction stir welded butt joints. Various combinations of tool traverse speed and tool rotational speed were characterized and tested to determine the best strength properties.
Article
Automation & Control Systems
Tinu P. Saju, R. Ganesh Narayanan, Barnik Saha Roy
Summary: The study investigated the use of dieless friction stir riveting on dissimilar grades of aluminum alloy sheets, finding that single-hole configurations perform better than multi-hole configurations in terms of mechanical properties. The research also examined the fracture modes and microstructural changes related to this difference in performance.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2021)
Article
Materials Science, Multidisciplinary
Amrit Raj Paul, Avinash Mishra, Manidipto Mukherjee, Dilpreet Singh
Summary: This paper investigates the microstructure and mechanical properties of SS-Al dissimilar joints formed by Al2O3 interfacial doping in a wire arc direct energy deposition process with varying heat input. The results show that Al2O3 has a significant effect on grain refinement, and the presence of FeAl, FeAl3, and Fe2Al5 at the interface increases with increasing heat input. The presence of Al2O3 and intermetallic compounds improves the interfacial strength.
Article
Polymer Science
Jin-Feng Liu, Ying-Guo Zhou, Shu-Jin Chen, Shao-Qiang Ren, Jun Zou
Summary: This paper proposes and explores a hybrid manufacturing method for the friction stir welding (FSW) process and extrusion-based additive manufacturing (EAM) technology. The effects of FSW process using two different welding tools on the mechanical behaviors of 3D printing polymer parts are compared and investigated, and the corresponding mechanism is analyzed. The results show that the appropriate welding tool is beneficial for eliminating anisotropy and decreasing porosity of 3D-printed parts, thus verifying the improving effects of the FSW process on the mechanical behaviors of EAM parts. This study may provide assistance in modern industrial manufacturing for the processing of large custom components.
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)
Correction
Metallurgy & Metallurgical Engineering
Bin He, Lei Cui, Dong-Po Wang, Hui-Jun Li, Chen-Xi Liu
Summary: The authors apologize for any inconvenience caused.
ACTA METALLURGICA SINICA-ENGLISH LETTERS
(2021)
Article
Engineering, Mechanical
Robert Kosturek, Janusz Torzewski, Zdenek Joska, Marcin Wachowski, Lucjan Sniezek
Summary: This study investigated the performance of friction stir welded butt joints of the AA2519-T62 alloy at various tool rotation speeds. The results showed that an increase in tool rotation speed led to larger stir zone size and higher microhardness. The weld with the lowest tool rotation speed of 200 rpm exhibited reduced microhardness and was more susceptible to plastic deformation. Increasing tool rotation speed resulted in higher yield and tensile strength of the welds, with tensile failures occurring at different locations. The fatigue strength coefficient of the joints produced with 400-600 rpm tool rotation speed showed the smallest reduction.
ENGINEERING FAILURE ANALYSIS
(2022)
Article
Physiology
Kathleen Cantow, Thomas Gladytz, Jason M. Millward, Sonia Waiczies, Thoralf Niendorf, Erdmann Seeliger
Summary: This study used dynamic MRI to monitor kidney size and provided physiological interpretation of changes in renal oxygenation. The results showed correlations between changes in kidney size and T-2* and T-2. Monitoring kidney size allows for a better understanding of renal pathophysiology.
Article
Chemistry, Inorganic & Nuclear
Hao Ding, Athar Haroon, Simon Wan, Thoralf Niendorf, Sola Adeleke
Summary: Understanding the metabolic compartments involved in tumour progression is essential in cancer research. Deuterium metabolic spectroscopy (DMS) and metabolic imaging (DMI) have shown promise as tools for visualizing tumour metabolism in vivo. However, there are still various obstacles that need to be overcome for their implementation in clinical settings, including technological advancements in imaging hardware and further justification of DMI's potential through human studies and multidisciplinary collaboration.
Article
Materials Science, Multidisciplinary
Seyed Vahid Sajadifar, Philipp Krooss, Marcel Krochmal, Thomas Wegener, Akbar Heidarzadeh, Hannes Froeck, Janez Zavasnik, Olaf Kessler, Thomas Niendorf
Summary: This study presents the effects of aging under superimposed external stress on the fatigue performance and microstructural evolution of a high-strength aluminum alloy (EN AW-7075). The combination of heat treatment and external stress, known as stress aging, accelerates the precipitation kinetics and promotes the formation and growth of strengthening precipitates. The stress aging process also reduces the dimensions of precipitate-free zones near grain boundaries. Furthermore, stress aging enhances the monotonic mechanical properties of EN AW-7075 without degrading the cyclic performance in the low-cycle fatigue regime.
ADVANCED ENGINEERING MATERIALS
(2023)
Article
Engineering, Mechanical
Julia Richter, Christof Johannes Jaime Torrent, Marcel Krochmal, Thomas Wegener, Malte Vollmer, Thomas Niendorf
Summary: Gas-atomized (GA) and water-atomized (WA) commercially pure iron (cp-Fe) powders were processed using laser-based powder bed fusion, resulting in slightly higher porosity for the WA condition. Fatigue tests, which are negatively affected by porosity, also showed good properties for the WA condition. The microstructure stability significantly differed between the GA and WA specimens and can be explained based on chemical composition. The GA specimens exhibited yield phenomenon and softening under cyclic loading, while the WA specimens maintained microstructure stability in cyclic tests.
INTERNATIONAL JOURNAL OF FATIGUE
(2023)
Article
Engineering, Mechanical
T. Wegener, M. Krochmal, T. R. Moeller, M. T. Le, A. Czap, F. Marianek, H. Fakesch, T. Niendorf
Summary: This study investigates the microstructure and mechanical properties, specifically the low-cycle fatigue behavior, of a novel high-strength mold steel. The results indicate that a more energy- and cost-intensive high-temperature annealing treatment can be avoided without significant loss of mechanical performance.
INTERNATIONAL JOURNAL OF FATIGUE
(2023)
Article
Materials Science, Multidisciplinary
A. Bauer, M. Wiegand, P. Wicke, N. Sommer, M. Vollmer, S. Boehm, T. Niendorf
Summary: The study investigates the weldability of hot-rolled Fe-Mn-Al-Ni shape memory alloy sheets using vacuum electron beam welding. Customized welding parameters, such as preheating or beam oscillation, are applied to achieve defect-free joining with thin weld seams and heat-affected zones. Post-weld cyclic heat treatment promotes abnormal grain growth across the weld seams, while smaller grains are formed within the fusion zone regardless of the welding parameters. In situ incremental strain tests indicate that the fusion zone has minimal impact on functional properties and structural failure, making electron beam welding a promising technology for joining Fe-Mn-Al-Ni shape memory alloys.
SHAPE MEMORY AND SUPERELASTICITY
(2023)
Article
Materials Science, Multidisciplinary
Seyed Vahid Sajadifar, Joerg Baumgartner, Marcel Krochmal, Andreas Maciolek, Marcus Klein, Moritz Roesser, Markus Grass, Hannes Froeck, Martin Fehlbier, Olaf Kessler, Stefan Boehm, Matthias Oechsner, Tobias Melz, Thomas Niendorf
Summary: The monotonic and cyclic properties of a novel Al-Mg-Zn-Cu-Si compositionally complex alloy (CCA) are investigated. Microstructural studies reveal the presence of a eutectic phase and fishbone-type structures embedded in the Al-matrix. The alloy shows promising mechanical properties under compressive loading, but exhibits low ultimate strength and brittle behavior under tension, as well as poor fatigue performance in the low-cycle fatigue (LCF) regime. The presence of brittle intermetallic phases and shrinkage defects are responsible for the poor tensile properties and inferior LCF behavior, despite homogenization treatments leading to spheroidization of all coarse precipitates.
ADVANCED ENGINEERING MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Jan Johannsen, Christian Lauhoff, Melanie Stenzel, Christoph Schnitter, Thomas Niendorf, Markus Weinmann
Summary: This study reports the synthesis of spherical titanium/niobium/tantalum (TNT) alloy powders by electrode induction melting gas atomization and investigates their microstructure and mechanical properties. It is found that the powders have a dendrite-type microstructure with Nb/Ta-rich dendritic and Ti-rich inter-dendritic phases. Processing by laser beam powder bed fusion (PBF-LB/M) changes the microstructures, resulting in homogeneous element distribution in the additively manufactured parts. Tensile testing reveals that all TNT alloys exhibit ductile fracture behavior with varying ultimate tensile strength (UTS) values and elongation at fracture.
MATERIALS & DESIGN
(2023)
Article
Materials Science, Multidisciplinary
M. Vollmer, A. Bauer, T. Niendorf
Summary: The study introduces a new approach that combines different shape memory alloy phenomena to enable new applications. By changing transformation temperatures through the formation of nano-sized precipitates, the shape memory effect can be used in combination with superelasticity. Unlike conventional component design that aims at one specific phenomenon, this approach involves the formation of precipitates during activation of the shape memory effect.
Article
Materials Science, Multidisciplinary
Johanna-Maria Frenck, Janna Link, Malte Vollmer, Thomas Niendorf
Summary: The electrochemical corrosion properties of Fe-Mn-Al-Ni in different electrolytic solutions were investigated by measuring the open circuit potential and conducting potentiodynamic polarization measurements. The results showed that exposure to a high pH (=13.3) solution resulted in passive behavior. However, the addition of Cl- ions to the solution changed the corrosion behavior from passivating to non-passivating. Optical microscopy images revealed selective corrosion of the beta-Mn-phase or the gamma'-phase, regardless of the electrolytic solution.
Article
Radiology, Nuclear Medicine & Medical Imaging
Mostafa Berangi, Andre Kuehne, Helmar Waiczies, Thoralf Niendorf
Summary: This study demonstrates the feasibility of safe and B-1(+)-distortion-free MRI of implantation sites using optimized parallel RF field transmission based on a multi-objective genetic algorithm. The results show that this technique can eliminate B-1(+) artefacts at implantation sites and enable uniform gradient-echo MRI.
Article
Radiology, Nuclear Medicine & Medical Imaging
Bilguun Nurzed, Andre Kuehne, Christoph Stefan Aigner, Sebastian Schmitter, Thoralf Niendorf, Thomas Wilhelm Eigentler
Summary: This study aims to investigate the feasibility of human cardiac MR at 14.0 T using high-density RF dipole transceiver arrays in conjunction with static and dynamic parallel transmission. The results show that both static and dynamic pTx can enhance transmission field uniformity and efficiency at 14.0 T. These findings provide a technical foundation for further exploration into CMR at 14.0 T.
MAGNETIC RESONANCE MATERIALS IN PHYSICS BIOLOGY AND MEDICINE
(2023)
Article
Radiology, Nuclear Medicine & Medical Imaging
Carl J. J. Herrmann, Ludger Starke, Jason M. Millward, Joseph Kuchling, Friedemann Paul, Thoralf Niendorf
Summary: Accelerated T-2 and T-2* mapping using highly undersampled 2in1-RARE-EPI with compressed sensing (CS) reconstruction is feasible. The results show that for R-extra = 6, the overall MAPE for T-2* is <= 8% and <= 4% for T-2; for R-extra = 12, the overall MAPE is <13% for T-2* and <5% for T-2.
Article
Medicine, Research & Experimental
Ludger Starke, Jason M. Millward, Christian Prinz, Fatima Sherazi, Helmar Waiczies, Christoph Lippert, Marc Nazare, Friedemann Paul, Thoralf Niendorf, Sonia Waiczies
Summary: The study demonstrates that siponimod can be imaged non-invasively using 19F UTE MRI, laying the foundation for further preclinical and clinical investigations. This technique provides an accurate understanding of the distribution of CNS-acting drugs in individual patients, which can contribute to personalized therapy.
Article
Engineering, Mechanical
A. Maciolek, A. Joeckel, S. Voelkers, M. Hatzky, T. Suckow, L. Schell, S. V. Sajadifar, T. Wegener, B. Moeller, J. Baumgartner, T. Melz, S. Boehm, P. Groche, T. Niendorf
Summary: Zinc-containing aluminum alloys of the 7xxx series have the potential for lightweight applications due to their high strength and low density. Friction stir welding (FSW) has been shown to produce joints with excellent properties. Post-weld heat treatment (PWHT) can further improve the alloy's strength through precipitation hardening. However, PWHT can also lead to reduced fatigue strength, which can be improved by removing the surface layer.
INTERNATIONAL JOURNAL OF FATIGUE
(2024)
Article
Nanoscience & Nanotechnology
Ahmad Mirzaei, Peter D. Hodgson, Xiang Ma, Vanessa K. Peterson, Ehsan Farabi, Gregory S. Rohrer, Hossein Beladi
Summary: This study investigated the influence of parent austenite grain refinement on the intervariant boundary network in a lath martensitic steel. It found that refining the parent austenite grain led to a decrease in the fraction of certain boundaries in the martensite and an increase in the connectivity of low energy boundaries, ultimately improving the impact toughness.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
N. L. Church, C. E. P. Talbot, L. D. Connor, S. Michalik, N. G. Jones
Summary: Metastable beta Ti alloys based on the Ti-Nb system have attracted attention due to their unique properties. However, the unstable cyclic behavior of these alloys has hindered their widespread industrial use. Recent studies have shown that internal stresses, including those from dislocations, may be responsible for this behavior. This study demonstrates that inter-cycle thermal treatments can mitigate the unstable cyclic behavior, providing a significant breakthrough in our understanding of Ti-Nb superelastic materials.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Di Zhao, Chenchen Zhao, Ziyang Xiu, Jiuchun Yan
Summary: This study proposes a novel strategy for achieving the bonding of SiC ceramic and Al alloy using ultrasound. The ultrasound promotes the dissolution of Al into the solder, activating the solder and triggering the interfacial reaction between SiC ceramic and solder. With increasing ultrasonic duration, the bonding between SiC and Al transitions from partial to full metallurgical bonding.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Kang Du, Yang Zhang, Guangda Zhao, Tao Huang, Liyuan Liu, Junpeng Li, Xiyu Wang, Zhongwu Zhang
Summary: This paper systematically investigated the evolution of microstructure in Fe-Ni-Co-Al polycrystalline alloys and its effects on mechanical properties. The results revealed that the migration of grain boundaries in different processes is driven by different factors, which impacts the grain orientation and precipitate formation. In the process of directional recrystallization, grains with specific orientations grow in the grain boundary region and form the dominant orientation, while grains with lower migration rate form the minor orientation. The alloy produced through directional recrystallization exhibited good recoverable strain and superelastic strain, while the alloy produced through solid solution treatment showed no evident superelastic behavior.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Edohamen Awannegbe, Liang Chen, Yue Zhao, Zhijun Qiu, Huijun Li
Summary: This study employed laser metal deposition to additively manufacture Ti-15Mo wt% alloy, and subsequently subjected it to post-fabrication uniaxial thermomechanical processing. The results showed that different zones in the microstructure remained after processing, and deformation mechanisms mainly involved slip and martensite formation. The compressive mechanical properties were found to be dependent on strain rate, with higher flow stress and compressive strength observed at higher strain rates. Grain structure homogenisation was not achieved, leading to anisotropic tensile properties.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Reza Khatib Zadeh Davani, Enyinnaya George Ohaeri, Sandeep Yadav, Jerzy A. Szpunar, Jing Su, Michael Gaudet, Muhammad Rashid, Muhammad Arafin
Summary: This research aims to investigate the effect of roughing and finishing reductions on crystallographic texture. The results show significant heterogeneity in the centerline region, with higher intensity of certain textures. Drop Weight Tear Test indicates that steel specimens with lower and medium reductions exhibit superior low-temperature impact toughness compared to steel with higher reductions. The electrochemical hydrogen charging experiments confirm the presence of internal hydrogen cracks only in steel with lower and medium reductions.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Flavio De Barbieri, Denis Jorge-Badiola, Rodrigo Allende, Karem Tello, Alfredo Artigas, Franco Perazzo, Henry Jami, Juan Perez Ipina
Summary: This study examines the effect of Cr additions on the mechanical behavior of TWIP steel at temperatures ranging from 25°C to 350°C. The results indicate that different temperature-dependent strengthening mechanisms, including mechanical twinning, Dynamic Strain Aging, and slip bands, are at play. The stacking fault energy (SFE) influences the percentage of mechanical twinning, which in turn affects the strain hardening rate.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Hanlin Peng, Siming Huang, Ling Hu, Bingbing Luo, Liejun Li, Ian Baker
Summary: This study explores the weldability, microstructures, and mechanical properties of two L1(2)-nanoparticle-strengthened medium-entropy alloys after electron beam welding (EBW). The results show that strong yet ductile defect-free joints were produced, with larger grain sizes in the fusion zones compared to the heat-affected zones and base materials. Both EBWed MEAs exhibited high yield strengths, high ultimate tensile strengths, and good fracture strains at 77 K. The V-doping improved the cryogenic mechanical properties of the TMT MEA.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Yongxin Wang, Lei Chen, Lizi Shao, Shuo Hao, Motomichi Koyama, Xingzhou Cai, Xiaocong Ma, Miao Jin
Summary: This study investigated the tensile deformation behavior of an Mn-N bearing lean duplex stainless steel with metastable austenite. The results showed that the strain rate had significant influence on the work hardening, strain-induced martensitic transformation, and fracture mechanism.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Jong Woo Won, Seulbi Lee, Hye-Jeong Choe, Yong-Taek Hyun, Dong Won Lee, Jeong Hun Lee
Summary: Cold-rolled pure titanium showed improved sheet formability after undergoing cryogenic-deformation treatment. This treatment increased the thinning capability of the titanium and suppressed cracking during sheet forming. The formation of twins during deformation contributed to high thinning capability and increased strength through grain refinement and dislocation accumulation.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Handong Li, Lin Su, Lijuan Wang, Yanbin Jiang, Jiahui Long, Gaoyong Lin, Zhu Xiao, Yanlin Jia, Zhou Li
Summary: Homogenization heat treatment is a key procedure in controlling the second phase, enhancing composition uniformity, and workability of as-cast Cu-15Ni-8Sn alloy. This study found that electropulsing treatment (EPT) can significantly reduce treatment temperature and time, improve elongation and overall mechanical properties of the alloy.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Yuxuan Wang, Juntao Zou, Lixing Sun, Yunfei Bai, Zhe Zhang, Junsheng Cheng, Lin Shi, Dazhuo Song, Yihui Jiang, Zhiwei Zhang
Summary: A novel mechanical-heat-electricity synergistic method was proposed to enhance the mechanical properties of Cu-15Sn-0.3Ti alloy by forming annealing twins (ATs). The combination method of Rotary swaging (RS) and Electric pulse treatment (EPT) successfully induced recrystallization and refinement of the microstructure, leading to a significant increase in the strength of the alloy within a short time.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Zhiyi Ding, Jiangtao Xie, Tong Wang, Aiying Chen, Bin Gan, Jinchao Song
Summary: This study demonstrated the Ta-induced strengthening of CoCrNi-AlTi MEAs using nanoscale heterogeneous coherent precipitates. The addition of Ta and aging treatments significantly enhanced the mechanical properties of the alloy, including yield strength, ultimate tensile strength, and elongation.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Z. Y. You, Z. Y. Tang, B. Wang, H. W. Zhang, P. Li, L. Zhao, F. B. Chu, H. Ding
Summary: The mechanical properties and microstructural evolution of C-doped TRIP-assisted HEA under dynamic loading conditions were systematically investigated in this study. The results showed that dynamic tensile deformation led to an increase in yield strength and a decrease in ultimate tensile strength, with a trend towards increased total elongation. The primary deformation mechanisms shifted from TRIP and TWIP effects to deformation twinning and dislocations. The presence of carbides formed through C-doping hindered dislocation slip and promoted the activation of multiple twinning systems.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Feng Qin, Feihu Chen, Junhua Hou, Wenjun Lu, Shaohua Chen, Jianjun Li
Summary: Plastic instability in strong multilayered composites is completely suppressed by architecting nanoscale BCC Nb crystalline-amorphous CuNb interfaces.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
