Article
Materials Science, Multidisciplinary
Priyanka Agrawal, S. Karthikeyan, Surendra Kumar Makineni, Baptiste Gault, Dipankar Banerjee
Summary: A dynamic strain aging (DSA) regime is established in a near-a titanium alloy through constant strain rate tests, with jogged screw dislocations dominating the dislocation structure within slip bands. The model predicts a DSA peak at 673-723K, with C and Si as solute species responsible for DSA, but dominated by C in this temperature and strain rate regime. Atom probe tomography confirms C and Si segregation at the dislocations, supporting the model.
Article
Materials Science, Multidisciplinary
Shuaichen Shi, Haitao Shu, Changjian Li, Yugao Wei, Sisheng Yang
Summary: In this study, the deformation behavior and mechanical property evolution of Inconel 625 were investigated using small punch test (SPT) at different temperatures and deformation rates. It was found that the small punch characteristic parameters decreased with increasing temperature, and a plateau-like region was observed between 300-600 °C. Dynamic strain aging (DSA) characteristics were observed in the load-displacement curves within a similar temperature range. The serration types, critical displacement, and maximum load drop were examined to analyze the small punch DSA behavior. It was concluded that SPT is a reasonable method to evaluate the DSA behavior and can replace the uniaxial tensile test.
MATERIALS TODAY COMMUNICATIONS
(2023)
Article
Materials Science, Multidisciplinary
H. J. Lee, M. K. Razali, K. H. Lee, M. S. Joun
Summary: A new material model for carbon steel S25C, with a focus on dynamic strain aging, was developed using an optimization technique to fit material parameters and constants. The optimized model showed reduced maximum errors in state variables.
MATERIALS TODAY COMMUNICATIONS
(2021)
Article
Engineering, Multidisciplinary
Yong-qiang Du, Jian Zheng, Gui-bo Yu, Jian-zhuang Zhi
Summary: The study found that with the increase of aging time, the transverse relaxation characteristic of HTPB coating changed, and the proportions of crosslinking chain and dangling chain also changed. Pre-strain had an impact on the crosslinking network structure of the coating, but this effect gradually weakened over time.
DEFENCE TECHNOLOGY
(2021)
Article
Engineering, Mechanical
Jishnu J. Bhattacharyya, Sriramya Nair, Darren C. Pagan, Vahid Tari, Ricardo A. Lebensohn, Anthony D. Rollett, Sean R. Agnew
Summary: The study of the elastoplastic transition of a metastable 13-Ti alloy, Timetal-18, revealed that small crystallographic reorientations during the transition were insufficient to distinguish between candidate slip modes, and that hardening was primarily due to intergranular interactions. Examination of individual responses showed some grains exhibiting "strain softening," highlighting the importance of intragranular heterogeneity in future research.
INTERNATIONAL JOURNAL OF PLASTICITY
(2021)
Article
Chemistry, Multidisciplinary
Max Tigo Rietberg, Sebastiaan Waanders, Melissa Mathilde van de Loosdrecht, Rogier R. Wildeboer, Bennie ten Haken, Lejla Alic
Summary: Efficient development and utilization of magnetic nanoparticles (MNPs) for enhanced biosensing applications relies on magnetization dynamics, which are complex and not yet fully understood, especially in the frequency range where Neel and Brownian relaxation processes compete. A model was developed to predict the behavior of MNPs under varying magnetic field conditions, showing overall good agreement between measurement and simulation.
Article
Mechanics
Byron Guerrero, Martin F. Lambert, Rey C. Chin
Summary: This study investigates the time response and transient turbulence dynamics of rapidly decelerating turbulent pipe flows. Through statistical analysis of direct numerical simulations, it is found that turbulent flows undergo four transitional stages: inertial, friction recovery, turbulence decay, and core relaxation. The FIK identity is used to understand the time response of the skin friction coefficient.
JOURNAL OF FLUID MECHANICS
(2023)
Article
Physics, Applied
Sanaz Koohfar, Yasemin Ozbek, Hayden Bland, Zhan Zhang, Divine P. Kumah
Summary: The structural and magnetic properties of LSCO/LSMO heterostructures grown on (001)-oriented MgO by molecular beam epitaxy were investigated. Strain relaxation was observed within the first 2-3 unit cells of the film due to large film-substrate lattice mismatch. The presence of LSCO spacer and capping layers induced ferromagnetism in ultra-thin LSMO layers, with magnetic easy axis oriented in the film plane. Magnetic anisotropy of the superlattice was found to be significantly higher than bulk LSMO, highlighting the crucial role of interfacial interactions in tuning magnetic anisotropy at oxide interfaces.
JOURNAL OF APPLIED PHYSICS
(2021)
Article
Materials Science, Textiles
Shayan Abrishami, Nazanin Ezazshahabi, Fatemeh Mousazadegan
Summary: This study evaluated and compared the stress relaxation of sewing threads in different forms, finding that an increase in extension rate enhances stress relaxation while a rise in strain level diminishes it. When sewing threads deform into loops, higher values of stress relaxation were recorded, consistent with the two-component Maxwell's model.
JOURNAL OF THE TEXTILE INSTITUTE
(2021)
Article
Materials Science, Multidisciplinary
Giuseppe Mirone, Raffaele Barbagallo, Michele Maria Tedesco, Daniele De Caro, Matteo Ferrea
Summary: This study focuses on the experimental derivation of the flow curves of heat-resistant high-strength steels under dynamic strain rates and the effects of moderate temperatures induced by self-heating at static rates.
Article
Nanoscience & Nanotechnology
Amin Ghaedrahmati, Hamid Reza Jafarian, Ali Reza Eivani, Saeed Khani Moghanaki
Summary: Inconel 617 specimens were hot rolled at various temperatures and the effect on dynamic strain aging (DSA) was examined through tensile tests. The microstructural evolution was studied using different techniques and the stress-strain curves were analyzed. Changes in serrated flow and the occurrence of different types of serrations were observed with variations in strain rate and temperature. The activation energy for DSA was calculated and the diffusion of substitutional atoms was found to be the main factor. The hot rolling temperature was also found to significantly influence DSA.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Chemistry, Physical
Nina Selyutina, Yuri Petrov
Summary: The temporal nature of static and dynamic deformation of fibre metal laminates is discussed in this study. A proposed innovative model is verified using layered composites. The modified relaxation model describes the deformation of the layered composites from elastic to irreversible deformation. The effects of the transition from static to dynamic loading are considered. The verification of the model is done using various composites, and theoretical deformation curves are predicted for different strain rates.
Article
Materials Science, Multidisciplinary
Pentti M. Kaikkonen, Mahesh C. Somani, Leo Pentti Karjalainen, Jukka I. Komi
Summary: Efforts to develop very fine, medium-carbon bainitic steels via the low-temperature ausforming process in the past decade have shown improved strength and shorter isothermal holding times for bainitic transformation. The study on static recrystallization characteristics using stress-relaxation method revealed the influence of microalloying and Mo addition on the process, with new regression equations established for estimating 50% SRX times.
Article
Engineering, Multidisciplinary
Jin Yu, Yaoliang Zhu, Wei Yao, Xueying Liu, Chonghong Ren, Yanyan Cai, Xin Tang
Summary: The influence of cyclic weak disturbance on the stress relaxation of rock depends on the initial stress level and axial strain level, showing different nonlinear growth characteristics. Initially, the relaxation magnitude of weak disturbance increases with the increase of the initial stress level, while the stress relaxation rate nonlinearly decreases with axial strain levels. The weak disturbance effect presents a nonlinear growth characteristic of first decreasing and then increasing as the strain increases.
Article
Chemistry, Physical
D. S. Yang, J. Wang, J. M. Pelletier, K. K. Song, J. C. Qiao
Summary: Dynamic mechanical relaxation processes are essential in understanding the physical and mechanical properties of metallic glasses. The behavior of different metallic glass systems varies, with physical aging affecting the intensity of beta relaxation. This research provides new insights into the correlation between structural heterogeneity and beta relaxation in metallic glasses.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
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)