Article
Materials Science, Multidisciplinary
Madeleine Bignon, Pratheek Shanthraj, Joseph D. Robson
Summary: This study presents a model for deformation enhanced precipitate growth and coarsening kinetics in pre-aged 7xxx aluminum alloys under warm forming conditions. The model incorporates the effect of deformation on solute diffusivity and excess vacancy accumulation, and is validated with experimental data. It is found that the interaction between solute supersaturation and excess vacancy concentration can result in complex non-monotonic variations in precipitate growth rate for certain strain rates and temperatures.
Article
Chemistry, Physical
Hasan Vafaeenezhad, Hamid Reza Shahverdi
Summary: This study investigates the impact of incorporating different amounts of V into an Al-0.06Sc-0.06Zr-0.18Si at% alloy on the behavior of nanoprecipitates and the creep resistance of the alloy. The findings show that the amount of V added affects the structure, kinetics, coarsening resistance, and creep resistance of the alloys.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Physical
Olga A. Yakovtseva, Andrey I. Bazlov, Alexey S. Prosviryakov, Nadezhda B. Emelina, Natalia Yu. Tabachkova, Anastasia V. Mikhaylovskaya
Summary: The microstructure, phase composition, and hardness evolutions of high-energy ball milled Al-15.3%Mn-6.2%Cu alloy and alloy matrix composites with 2% and 5% Al2O3 fine particles were investigated. The milling process dissolved the non-equilibrium phase CuAl2 and equilibrium phase Al20Cu2Mn3, resulting in a decrease in the lattice parameter and microhardness of aluminum. Further milling time and annealing of pre-milled samples led to the decomposition of the solid solution and precipitation of the Mn-enriched phase. The addition of Al2O3 particles refined the particles, increased the microhardness, and promoted the dissolution of phases and precipitation of the Mn-enriched phase, improving the precipitation hardening effect.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Physical
Lipeng Ding, Lv Zhao, Yaoyao Weng, Dominique Schryvers, Qing Liu, Hosni Idrissi
Summary: The heterogeneous precipitation of the eta phase on the E dispersoids of the 7075 aluminum alloy was investigated, revealing that the B particles are heterogeneously precipitated at the E particle interface, stabilizing the E/Al interface and increasing the drive force of heterogeneous precipitation.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Materials Science, Multidisciplinary
Jobin K. Joy, Tejas Umale, Dexin Zhao, Alexandros Solomou, Kelvin Xie, Ibrahim Karaman, Dimitris C. Lagoudas
Summary: In this study, a finite element-based micromechanical modeling framework was developed to predict the constitutive response of precipitated NiTiHf SMAs. By considering composition changes in the material and incorporating their effects, the model showed good agreement with experimental measurements.
Article
Nanoscience & Nanotechnology
Zhenyuan Wang, Haixuan Cao, He Zheng, Peili Zhao, Zhen Tang, Ruilong Huang, Shuangfeng Jia, Ying Zhang, Dongshan Zhao, Jianbo Wang
Summary: This study explores the effect of aging hardening on the mechanical properties and precipitation transformation of the as-cast Mg-0.9Co-4.5Y alloy. The results show that the ultimate compressive strength (UCS) and compressive yield strength (CYS) of the alloy at peak hardness are 604.8 MPa and 401.5 MPa respectively, while the compression rate (ε) after solution-treated is 21.9%. An in-depth investigation reveals that the improvement of malleability is associated with the reduction of the volume fraction of LPSO phase after solution treatment, and the substantial increase of CYS after peak-aging is related to the dispersion strengthen of MgYCo4 phase and precipitation of β' and β" phases.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Materials Science, Multidisciplinary
Z. H. Li, D. Cheng, K. Wang, E. R. Hoglund, J. M. Howe, B. C. Zhouc, T. T. Sasaki, T. Ohkubo, K. Hono
Summary: This study investigated the precipitation process of a Mg-0.3Ca-0.6Zn alloy during isothermal aging at 200 degrees C using advanced microscopy techniques and first-principles calculations. The results revealed the formation of monolayer G.P. zones, which transformed into tri-atomic layer η'' and η' plates. The η' plates then formed pairs and stacks with pure magnesium layers. The unique structure of coarse η1 plates led to a different precipitate microstructure evolution from other Mg-RE-Zn alloys. First-principles calculations confirmed the crystal structure and stability of the precipitates, supporting a new precipitation sequence.
Article
Chemistry, Physical
Diego de Araujo Santana, Claudio Shyinti Kiminami, Francisco Gil Coury
Summary: This study focuses on the prediction of yield strength of a newly developed alloy through experimental and modeling approaches. The results demonstrate that different strengthening mechanisms can be modeled independently with satisfactory accuracy.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Nanoscience & Nanotechnology
A. E. Davis, J. R. Kennedy, D. Lunt, J. Guo, D. Strong, J. D. Robson
Summary: Preageing technique can significantly increase the hardness of magnesium alloys, reduce total ageing times, and provide a certain degree of customization of mechanical properties through control of precipitate habit plane and morphology. However, the effectiveness of this technique depends on the alloy system, with the focus on the fundamental processes of precipitate nucleation and phase evolution.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Materials Science, Multidisciplinary
Lipeng Ding, Chen Ji, Chang Lu, Ruojin Zang, Yaoyao Weng, Qing Liu, Zhihong Jia
Summary: The precipitation behavior of a Si-rich low Cu Al-Mg-Si-Cu alloy was investigated using advanced microscopy techniques and first-principles calculations. The study revealed that the addition of copper alters the precipitation sequence and leads to the formation of different precipitates at different stages.
MATERIALS CHARACTERIZATION
(2022)
Article
Materials Science, Multidisciplinary
Antonis Baganis, Marianthi Bouzouni, Spyros Papaefthymiou
Summary: The study investigated the effects of heat treatment on the microstructure and mechanical properties of Al-Mg-Si alloys using a Phase-Field modeling approach. It focused on recrystallization and grain growth mechanisms, as well as the calculation of yield strength and hardness after different ageing treatments. The results showed that the pinning force of secondary particles led to a slight decrease in final grain radius, and different ageing temperatures had an impact on ageing conditions for distinct ternary systems.
Article
Engineering, Mechanical
Sufyan Akram, Anatolii Babutskyi, Andreas Chrysanthou, Diogo Montalvao, Mark J. Whiting, Nada Pizurova
Summary: The study utilized alternating magnetic field treatment to enhance the wear resistance of nickel-aluminium bronze and aluminium alloy 2014-T6. Results showed reduction in wear scars and coefficient of friction post-treatment, attributed to increased precipitation of kappa IV and GP zones as well as theta in the respective alloys. Transmission electron microscopy and X-ray diffraction revealed changes in dislocation distribution and residual stress. The mechanism behind these changes was discussed considering the ferromagnetic properties of nickel-aluminium bronze and the paramagnetic nature of AA2014.
Article
Chemistry, Physical
Tsai-Fu Chung, Shan-Qiao Lin, Hongxing Li, Chien-Nan Hsiao, Jer-Ren Yang, Cheng-Si Tsao, Takahito Ohmura
Summary: We present a study on the microstructure evolution and strengthening behavior of delta'/theta'/delta' precipitates in the aged Al-Cu-Li-Mg aluminum alloy using atomic high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM) and in-situ TEM compression straining. The in-situ microstructure evolution of the delta'/theta'/delta' precipitates is observed through atomic HAADF-STEM images. The formation of a monolayer GP(theta') zone, grown on the (001)(Al) plane, and subsequent transformation to theta' phase leads to the maturity of delta'/theta'/delta' precipitates. Dislocation-precipitate interactions, as well as the effects of inclined boundaries and thin T-1 precipitates, are investigated during in-situ TEM compression straining. The presence of stacking fault layers within sheared delta'/theta'/delta' precipitates is revealed by atomic HAADF-STEM images. Copyright © 2023 Elsevier B.V. All rights reserved.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Physical
B. Z. Sun, X. L. Lu, Q. Y. Huang, L. R. Liu
Summary: In this study, the formation mechanism of beta(1) precipitate in precipitation-hardenable rare earth magnesium alloys is investigated. The phase transformation from beta(s)' to beta(1) is examined using atomic-scale high-angle annular dark-field scanning transmission electron microscopy, and the nucleation and growth mechanisms of beta(1) are proposed. The results reveal the occurrence of pseud beta(1) with a lower Ce-content on the domain boundary between two sets of staggered beta(')(S) lattices, and the structural evolution from beta(')(S) to beta(1) is implemented layer by layer through pseud beta(1). Nucleation and growth pathways are discussed based on the formation energy and strain energy.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Nanoscience & Nanotechnology
Tong Yang, Yi Kong, Yong Du, Kai Li, Dominique Schryvers
Summary: Submicron-sized quasicrystalline particles were achieved in an Al-Zn-Mg-Cu alloy produced using traditional melting. These particles consist of an Al-Fe-Ni core and a Mg-Cu-Zn shell, randomly embedded in the Al matrix. The diffraction patterns reveal a decagonal core and an icosahedral shell with five-fold symmetry. The presence of Fe and Ni impurities is found to be crucial in the formation of this unusual ternary core-shell quasicrystalline particle, providing novel insights into the formation of quasicrystals in traditional industrial Al alloys.
SCRIPTA MATERIALIA
(2023)
Review
Materials Science, Multidisciplinary
Takeshi Saito, Eva A. Mortsell, Sigurd Wenner, Calin D. Marioara, Sigmund J. Andersen, Jesper Friis, Kenji Matsuda, Randi Holmestad
ADVANCED ENGINEERING MATERIALS
(2018)
Article
Crystallography
Espen Undheim, Per Erik Vullum, Randi Holmestad, Lars Arnberg, Marisa Di Sabatino
JOURNAL OF CRYSTAL GROWTH
(2018)
Article
Crystallography
Espen Undheim, Kensaku Maeda, Lars Arnberg, Randi Holmestad, Kozo Fujiwara, Marisa Di Sabatino
JOURNAL OF CRYSTAL GROWTH
(2018)
Article
Materials Science, Multidisciplinary
Hiroki Nakayasu, Equo Kobayashi, Tatsuo Sato, Randi Holmestad, Knut Marthinsen
MATERIALS CHARACTERIZATION
(2018)
Article
Materials Science, Multidisciplinary
J. K. Sunde, C. D. Marioara, A. T. J. van Helvoort, R. Holmestad
MATERIALS CHARACTERIZATION
(2018)
Article
Materials Science, Multidisciplinary
Eva Anne Mortsell, Ida Westermann, Calin Daniel Marioara, Ketill Olav Pedersen, Sigmund Jarle Andersen, Jostein Royset, Bjorn Holmedal, Randi Holmestad
Article
Materials Science, Multidisciplinary
Elisabeth Thronsen, Calin D. Marioara, Jonas K. Sunde, Kazuhiro Minakuchi, Tetsuya Katsumi, Iven Erga, Sigmund J. Andersen, Jesper Friis, Knut Marthinsen, Kenji Matsuda, Randi Holmestad
MATERIALS & DESIGN
(2020)
Article
Materials Science, Multidisciplinary
Adrian Lervik, John C. Walmsley, Lars Lodgaard, Calin D. Marioara, Roy Johnsen, Otto Lunder, Randi Holmestad
Article
Nanoscience & Nanotechnology
Xuanliang Chen, Daehan Kim, O. Minho, Calin D. Marioara, Sigmund J. Andersen, Adrian Lervik, Randi Holmestad, Equo Kobayashi
Summary: Pre-deformation has a strong impact on the subsequent age-hardening behavior of the Al-3Mg1Cu alloy, accelerates precipitation, enhances hardness peaks, inhibits cluster formation, and increases the amount of precipitates along dislocation lines. This study's findings are important for the advancement of combined mechanical deformation and heat treatment processes.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Materials Science, Multidisciplinary
Xuanliang Chen, Eva Anne Mortsell, Jonas Kristoffer Sunde, O. Minho, Calin Daniel Marioara, Randi Holmestad, Equo Kobayashi
Summary: In this study, room temperature cyclic deformation was attempted to strengthen Al-Mg-Si alloys, resulting in similar strength and approximately twice the uniform elongation compared to peak aged samples. The high density of dislocations and nanoclusters observed in the cyclically deformed samples are believed to be the main reasons for this strengthening effect. Different cyclic deformation conditions were explored and their effects discussed.
Article
Microscopy
Haakon Tvedt, Calin D. Marioara, Elisabeth Thronsen, Christoph Hell, Sigmund J. Andersen, Randi Holmestad
Summary: When the Al-Mg-Si(-Cu) alloy system undergoes age hardening, various types of precipitates form. This study developed the AutomAl 6000 software, which can automatically determine the column positions and species in the image and analyze and export structural data.
Article
Materials Science, Multidisciplinary
Feng Qian, Eva A. Mortsell, Calin D. Marioara, Sigmund J. Andersen, Yanjun Li
Review
Physics, Multidisciplinary
Sigmund J. Andersen, Calin D. Marioara, Jesper Friis, Sigurd Wenner, Randi Holmestad
ADVANCES IN PHYSICS-X
(2018)
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)
