Article
Construction & Building Technology
Nariman Afzali, Georjina Jabour, Natalie Stranghoener, Peter Langenberg
Summary: In addition to their high mechanical strength, duplex stainless steels are increasingly being used in highly corrosive environments, particularly in steel bridges exposed to low temperatures and fatigue loads. However, measures need to be taken to prevent brittle fracture in low temperature applications. A comprehensive study has been conducted to select duplex stainless steel materials and avoid brittle fracture, based on the fracture mechanics principles of EN 1993-1-10. Charpy-V impact tests and fracture toughness tests were carried out on various duplex stainless steels to develop toughness requirements for new duplex classes. The validity of the existing Master Curve concept and the applicability of the transition temperature correlation for duplex stainless steels were investigated through experimental tests. This contribution presents preliminary results of these investigations.
JOURNAL OF CONSTRUCTIONAL STEEL RESEARCH
(2024)
Article
Materials Science, Multidisciplinary
J. Dong, J. Shen, Y. H. Sun, H. B. Ke, B. A. Sun, W. H. Wang, H. Y. Bai
Summary: The study found that the torsion fracture of metallic glasses may deviate from the circumferential shear plane, and the fracture angle is closely related to the composition and size, showing an intrinsic relationship between fracture mechanism and fracture toughness in MGs.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2021)
Article
Nanoscience & Nanotechnology
Takahiro Masuda, Yongpeng Tang, Intan Fadhlina Mohamed, Zenji Horita
Summary: In this study, an AZ61 Mg alloy was processed by high-pressure torsion (HPT) to refine the grain size. Using a facility with an upscaled capacity of 500 ton, 30 mm diameter disks were processed under 6 GPa. Tensile tests at elevated temperatures showed that the grain size was reduced to around 320 nm after HPT processing at 423 K for 10 turns. This grain size reduction led to a superplastic elongation of more than 400% at 473 K with an initial strain rate of 1.0 x 10(-3) s(-1). Comparing the results with conventional 10 mm diameter disks, it was found that the total elongation was invariably higher for the 30 mm disks, and this difference was attributed to the anisotropy due to material flow.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Materials Science, Multidisciplinary
Martin Stueckler, Lukas Weissitsch, Stefan Wurster, Heinz Krenn, Reinhard Pippan, Andrea Bachmaier
Summary: This study investigates the formation of solid solutions of Cu, Fe, and Co through high-pressure torsion, aiming at synthesizing soft magnetic materials with a homogeneous and nanocrystalline microstructure. Different processing conditions lead to either single-phase supersaturated solid solutions or nanocomposites, depending on the Co-to-Fe ratio. The resulting microstructure exhibits enhanced magnetic properties and remains stable at temperatures up to 400 degrees C.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2021)
Article
Materials Science, Multidisciplinary
Deepika Tirumalasetty, Darshan Chalapathi, Veerabhadra Veeramusti, S. Sankaran, Anand K. Kanjarla
Summary: Crystallographic texture has a significant effect on the plastic anisotropy and formability of materials; in single phase materials, texture is influenced by prior thermomechanical processing, while in multiple phase materials like DSS, texture is also influenced by the orientation relationship during phase transformations; the study shows that the orientation relationship and Bain variant classifications play a crucial role in the plastic anisotropy and formability of DSS.
Article
Materials Science, Multidisciplinary
Franziska Staab, Enrico Bruder, Lukas Scha, Konstantin Skokov, David Koch, Benjamin Zingsem, Esmaeil Adabifiroozjaei, Leopoldo Molina-Luna, Oliver Gutfleisch, Karsten Durst
Summary: Textured nanocrystalline SmCo5-Cu magnets are produced by high-pressure torsion (HPT) of powder blends consisting of SmCo5 and Cu powder. The process overcomes limitations imposed by the phase diagram as in conventional sintering routes, enabling a free selection of the magnetic phase and the grain boundary phase. Increasing number of rotations during HPT leads to structural refinement, increasing coercivity, and amorphous structure of strongly deformed SmCo5 particles. The magnetic hardening is attributed to microstructural refinement and magnetic decoupling of hard magnetic SmCo5 grains by Cu.
Article
Nanoscience & Nanotechnology
Hamed Shahmir, Peyman Asghari-Rad, Mohammad Sajad Mehranpour, Farsad Forghani, Hyoung Seop Kim, Mahmoud Nili-Ahmadabadi
Summary: High-pressure torsion on an equiatomic CoCrFeNiMn high entropy alloy at room and cryogenic temperatures induces FCC to HCP and BCC martensitic transformations, effectively strengthening the alloy through increasing straining and decreasing deformation temperature. This transformation plays a significant role in altering the mechanical properties of the alloy under different deformation conditions.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Materials Science, Multidisciplinary
Andrey Volokitin, Abdrakhman Naizabekov, Irina Volokitina, Sergey Lezhnev, Evgeniy Panin
Summary: The study shows that severe plastic deformation by the HPT method plays a favorable role in increasing the degree of grain refining of AISI-316 steel, which directly benefits the mechanical properties of the material.
Article
Chemistry, Physical
George Franks, Mitchell L. Sesso, Matthew Lam, Yi Lu, Liqing Xu
Summary: The use of J-integral approach in elastic plastic fracture mechanics quantitatively accounted for plastic deformation of wet particulate materials for the first time. Plastic deformation was found to be the predominant energy dissipation mechanism during fracture, compared to the previously used linear elastic fracture mechanics approach. Additionally, the toughness of wet particulate materials was observed to increase with saturation level.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2021)
Article
Chemistry, Physical
Gerda Rogl, Oliver Renk, Sanyukta Ghosh, Ramesh Chandra Mallik, Andriy Grytsiv, Jiri Bursik, Erhard Schafler, Filip Tuomisto, Ernst Bauer, Peter Franz Rogl
Summary: The study investigates the influence of shear strain on the microstructural, physical, and mechanical properties of bulk samples consolidated by high-pressure torsion, finding that as shear strain increases, electrical resistivity rises while thermal conductivity decreases. Moreover, the Seebeck coefficient remains largely unchanged.
ACS APPLIED ENERGY MATERIALS
(2021)
Article
Nanoscience & Nanotechnology
Paula C. de Oliveira, Luciano A. Montoro, Maria Teresa Perez-Prado, Anton Hohenwarter, Roberto B. Figueiredo, Augusta Isaac
Summary: The study found that Nd readily segregates along boundaries in the early stages of severe plastic deformation of the magnesium alloy, while Mn forms nanoparticles and segregates along boundaries. As the strain increases, the hardness of the alloy rapidly increases and saturates, suggesting that the contribution of Mn to the strength of the alloy is minimal.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Review
Materials Science, Multidisciplinary
Shiv Prakash Singh, Mahmoud Ebrahimi, Shokouh Attarilar, Liqiang Wang, Qudong Wang, Faramarz Djavanroodi
Summary: Metallic glasses, known as amorphous and metastable materials, possess superior mechanical properties compared to crystalline materials. The severe plastic deformation (SPD) method has been used to enhance the ductility of these glasses, resulting in improved properties. Recent research on nanostructured metallic glasses has shown that properties such as mechanical, thermal, and magnetic have been enhanced compared to bulk metallic glass.
FRONTIERS IN MATERIALS
(2022)
Article
Chemistry, Physical
Martin Stueckler, Jakub Zalesak, Timo Mueller, Stefan Wurster, Lukas Weissitsch, Martin Meier, Peter Felfer, Christoph Gammer, Reinhard Pippan, Andrea Bachmaier
Summary: Nanocrystalline materials with beneficial mechanical and physical properties need stable microstructures at elevated temperatures to broaden their application. This study focuses on investigating the evolution of oxides in CuCo alloys after annealing, which were severely plastically deformed using high-pressure torsion. The results show the growth of primary oxides and the formation of another species of oxide at elevated temperatures. The coarsening observed in heat-treated samples can be attributed to different oxide amounts. The study also reveals that the majority of oxides present after annealing are already present in the starting materials.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Multidisciplinary
Hamed Shahmir, Mahmoud Nili-Ahmadabadi, Hyoung Seop Kim, Terence G. Langdon
Summary: Experiments were conducted to investigate the phase transformation during high-pressure torsion in Ti-based alloys. The results showed that increasing the rotation speed led to a decrease in the volume fraction of the ω-phase in pure titanium and a loss of the β phase in Ti-6Al-4V alloy. The local temperature increment was found to encourage or suppress the phase transformation in Ti-based alloys.
MATERIALS CHARACTERIZATION
(2023)
Article
Chemistry, Physical
Yan Beygelzimer, Yuri Estrin, Oleksandr Davydenko, Roman Kulagin
Summary: The article presents a theoretical study of the regimes of high-pressure torsion (HPT) with possible slippage of the deforming material on the interfaces with anvils. A generalised condition for gripping the specimen with anvils is established, providing a basis for an analytical investigation of the HPT deformation. The results of the analytical modelling are supported by finite-element calculations, showing that plastic deformation is furnished by non-shear flows for friction stress below the shear stress of the specimen material, expanding the range of possible process regimes.
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)