Article
Nanoscience & Nanotechnology
Aritra Sarkar, Manmath Kumar Dash, A. Nagesha
Summary: Investigation at 923K reveals that high mean stress in high R-ratio induces creep damage and significant HCF-creep interaction under small alternating stress. Fractographic and EBSD investigations confirm distinct fracture characteristics and underlying deformation mechanisms at different mean stress levels.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Nanoscience & Nanotechnology
Aritra Sarkar, Surya D. Yadav, A. Nagesha
Summary: This study utilizes EBSD technique to investigate the deformation mechanisms under high cycle fatigue-creep interaction in a Ni-based superalloy. It reveals that creep damage induces non-uniform distribution of local misorientation near grain boundaries due to grain boundary sliding. Moreover, an increase in hold temperature to 750°C promotes creep cavitation and leads to the transformation of twin boundary characteristics from Sigma 3 to other higher angle boundaries, causing partial detwinning. Additionally, the 750°C hold temperature results in strength loss and intergranular failure.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Engineering, Mechanical
Shiven Ponnapureddy, Aritra Sarkar, A. Nagesha, N. Narasaiah, Bonta Srinivasa Rao
Summary: This study aims to re-evaluate the Haigh diagram by incorporating the effect of creep on High Cycle Fatigue (HCF). Through HCF-creep interaction tests, it was found that specimens failed for certain cra-crm combinations, resulting in deviations in the Haigh diagram when periodic holds at crm were imposed during HCF cycling. The deviation became more prominent with an increase in crm (increase in R) and hold time.
INTERNATIONAL JOURNAL OF FATIGUE
(2021)
Article
Chemistry, Physical
Naser A. Alsaleh, Sabbah Ataya, Fahamsyah H. Latief, Mohamed M. Z. Ahmed, Ahmed Ataya, Akrum Abdul-Latif
Summary: Lightweight magnesium alloys and magnesium matrix composites are increasingly used in high-efficiency applications such as automobile, aerospace, defense, and electronic industries. Fatigue failure is a common problem for moving and rotating parts made of cast magnesium and magnesium matrix composites. This study focused on the fatigue behavior of short fibers reinforced and unreinforced AE42 at different temperatures. Results showed that the fatigue strength of the reinforced AE42-C in high-cycle fatigue range was twice that of the unreinforced AE42. However, in the low-cycle fatigue range, the fatigue life of the composite materials was significantly shorter due to their low ductility.
Article
Engineering, Mechanical
Andrea Kusch, Daniele Crivelli, Luca Diviani, Matteo Dotta, Simone Salamina, Filippo Berto
Summary: The influence of pre-strain on the tensile and fatigue properties of a dual phase DP600 steel was studied. Pre-strain was found to increase yield and tensile strength. A modified stress life equation that accounts for pre-strain showed good agreement with experimental data. In low cycle fatigue, negligible influence of pre-strain was observed due to cyclic softening and residual stress relaxation.
FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES
(2023)
Article
Crystallography
Nashmi H. Alrasheedi, Mohamed M. El-Sayed Seleman, Mohamed M. Z. Ahmed, Sabbah Ataya
Summary: AZ91 is a widely used Mg alloy that can be strengthened with carbon short fibers to improve its mechanical properties. Understanding the tensile and fatigue behavior of these materials under alternating fatigue loads is crucial for their application, such as in the production of truck pistons.
Article
Engineering, Mechanical
Thomas Bouchenot, Kirtan Patel, Ali P. Gordon, Sachin Shinde
Summary: This study investigates the interaction of creep and high-cycle fatigue in industrial gas turbine blades, creating a microstructurally-informed life prediction model based on experimental results and post-test failure analysis.
INTERNATIONAL JOURNAL OF FATIGUE
(2021)
Article
Engineering, Aerospace
Joerg R. Riccius, Evgeny B. Zametaev
Summary: This method proposes a numerical analysis approach for turbine blade fatigue life, including thermal finite element analysis, structural analysis, and fatigue life analysis for both high-cycle and low-cycle fatigue. The method is demonstrated by analyzing a generic turbine blade of a hydrogen turbo pump.
Article
Mechanics
Xiaohui Chen, Shiji Liu, Yusong Tian, Lin Zhu, Lang Lang
Summary: 316FR-type low carbon stainless steel is often used in gas cooled reactor power plants subjected to high temperatures. A study was conducted to investigate the thermo-mechanical fatigue behavior of this steel. A viscoplastic constitutive model was proposed and implemented into ABAQUS software, showing good agreement with experimental results.
EUROPEAN JOURNAL OF MECHANICS A-SOLIDS
(2023)
Article
Materials Science, Multidisciplinary
Zhongxia Shang, Cuncai Fan, Jie Ding, Sichuang Xue, Adam Gabriel, Lin Shao, Thomas Voisin, Y. Morris Wang, Tongjun Niu, Jin Li, Tomas Diaz de la Rubia, Haiyan Wang, Xinghang Zhang
Summary: In this study, an additively manufactured 316LN austenitic stainless steel was irradiated with 3.5 MeV Fe ion at 450 degrees C to a peak dose of 220 dpa. Microscopy studies revealed that the additively manufactured sample had a lower Frank loop density and smaller size compared to the cold worked counterpart, suggesting that cellular structures may suppress the formation of perfect loops and reduce solute segregations. This work advances the understanding of high-temperature irradiation response of additively manufactured steels for nuclear reactor applications.
JOURNAL OF NUCLEAR MATERIALS
(2021)
Article
Nanoscience & Nanotechnology
J. Ganesh Kumar, G. V. Prasad Reddy, Alphy George, A. Saikumaran, R. Mythili, P. Anil Kumar, Arup Das Gupta, M. Vasudevan
Summary: The study investigated the thermal aging effects on 316LN stainless steel with different nitrogen contents at varying aging temperatures. The increase in nitrogen content and aging temperature resulted in higher amounts of precipitates and strengthening effects, influencing the tensile properties. The addition of nitrogen generally imparted interstitial solid solution strengthening to the steel, while different aging treatments led to phenomena such as dislocation-precipitate interactions, affecting the tensile properties.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Materials Science, Multidisciplinary
Renxian Yang, Shucheng Ma, Xin Cai, Xiaoqiang Hu, Dianzhong Li
Summary: The addition of cerium can significantly improve the rupture life of 316LN austenitic stainless steel under high stress, but may cause anomalous growth rate and reduce the creep rupture ductility under low stress.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Materials Science, Multidisciplinary
Andrew Gryguc, Seyed Behzad Behravesh, Hamid Jahed, Mary Wells, Bruce Williams, Rudy Gruber, Alex Duquette, Tom Sparrow, Jim Prsa, Xuming Su
Summary: The study successfully developed a closed die forging process for automotive suspension component using AZ80 Mg at different forging temperatures. The forged component properties were compared with other research works, and fatigue behavior was characterized for forged materials, with strain energy density proving to be the most robust method for comparison. The study provided a deeper understanding of the process-structure-properties relationship.
Article
Materials Science, Multidisciplinary
Lingfeng Pan, Peishan Ding, Dezhou Kong, Lijun Liu, Xiaotao Zheng
Summary: The fatigue and creep-fatigue properties of 316SS formed by selective laser melting (SLM) were investigated at different peak stresses, stress rates, and peak-holding times. The study found that 90 degrees specimens exhibited better fatigue life than 0 degrees specimens. The ratcheting evolution could be divided into three stages, with the main behavior occurring in the second and third stages. At stress rates above 10 MPa/s, the ratcheting evolution curves showed high overlap. Additionally, creep and creep-fatigue interaction promoted material damage evolution.
MATERIALS AT HIGH TEMPERATURES
(2023)
Article
Engineering, Mechanical
A. Tridello, D. S. Paolino
Summary: This paper analytically derives the statistical distribution of total strain and fatigue life in the LCF-HCF life range, based on the Coffin-Manson and Morrow model. Parameter estimation using the maximum likelihood principle allows consideration of both failures and runout specimens. Additionally, a straightforward procedure for design curve estimation based on the likelihood ratio confidence lower bound is developed. The proposed model is validated with literature datasets on steel and aluminum alloys, demonstrating its effectiveness and reliability compared to existing models.
FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES
(2023)
Article
Dentistry, Oral Surgery & Medicine
Pooja P. Netalkar, S. R. Maithreye, Y. M. Karuna, Srikant Natarajan, Thirupathi Gadipelly, Devadas P. Bhat, Arup Dasgupta, Amitha Lewis
Summary: The incorporation of nano-hydroxyapatite (nanoHAP) into pit and fissure sealant improved its penetration and adaptation properties as well as fluoride release. The nanoHAP group showed significantly more samples with no bubbles and no debris, and had significantly higher fluoride release compared to the conventional sealant.
INTERNATIONAL JOURNAL OF PAEDIATRIC DENTISTRY
(2022)
Article
Materials Science, Multidisciplinary
Alphy George, Vaishnavi B. R. Krupa, R. Mythili, Arup Dasgupta, J. Ganesh Kumar, G. V. Prasad Reddy
Summary: SS 316LN with varying nitrogen content was subjected to thermal aging for 20,000 h at 650 degrees C to evaluate its long-term structural integrity under operational conditions in nuclear reactors. The study revealed that the type, size, and morphology of evolving secondary phases are characteristic of nitrogen concentration, with the presence of M-23(C,N)6, Fe2Mo intermetallics, and Cr2N, forming hetero-structures in steels with high nitrogen content. The formation of different morphological derivatives of M-23(C,N)6 precipitates and the preference for growth in {111} / <110> gamma were observed, along with the impact of excess nitrogen content on the overall mechanical properties via precipitation strengthening effect.
JOURNAL OF MATERIALS SCIENCE
(2022)
Article
Materials Science, Multidisciplinary
Suruj Protim Neog, Arijit Lodh, Anish Karmakar, Akhil G. Nair, Arup Dasgupta, Subhankar Das Bakshi, Sourav Das
Summary: This study quantifies the shear strain developed in the deformed subsurface region of a bainitic steel with retained austenite during wear using an image digitisation technique. The stability aspect of retained austenite under a complicated deformation mechanism like wear is also investigated.
PHILOSOPHICAL MAGAZINE
(2023)
Article
Engineering, Mechanical
Durgesh Kumar Pandey, Prashant Kumar Verma, Abir Bhattacharyya, Aritra Sarkar
Summary: A novel back-stress deconvolution method based on nonlinear-kinematic hardening plasticity theory is proposed to simulate the hysteresis loops of low cycle fatigue in 316L(N) stainless steel. It is found that only three back-stresses are needed to model the back-stress and plastic strain response for all cycles, and the simulated results match well with the experiments.
INTERNATIONAL JOURNAL OF FATIGUE
(2023)
Article
Materials Science, Multidisciplinary
Suruj Protim Neog, Akhil G. Nair, Subhankar Das Bakshi, Arup Dasgupta, Sourav Das
Summary: In this study, a systematic analytical scheme was used to quantify the shear strain present in the subsurface region of a system, which is critical for understanding the stability of austenite.
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
(2023)
Article
Energy & Fuels
Shashank Shekhar Mishra, Partha Kumbhakar, Subramanian Nellaiappan, Nirmal Kumar Katiyar, Raphael Tromer, Cristiano F. F. Wollner, Douglas S. S. Galvao, Chandra S. S. Tiwary, Chanchal Ghosh, Arup Dasgupta, Krishanu Biswas
Summary: Chemical exfoliation was used to synthesize atomically thin two-dimensional multicomponent alloy from a multicomponent quasicrystalline alloy, which exhibited excellent catalytic performance in alkaline water splitting. The ultrathin two-dimensional sheets had a large active surface area and a high number of active sites for bifunctional catalysis. Molecular dynamics and density functional theory simulations supported the experimental results.
Article
Materials Science, Multidisciplinary
Aritra Sarkar, Jan Klusak, Kamila Kozakova, H. -j. Christ
Summary: The study investigates the fatigue behavior of type 304 stainless steel in annealed and predeformed conditions, focusing on high cycle and very high cycle fatigue. A fatigue diagram (S-N curve) extending to the very high cycle fatigue range is generated, showing different fatigue behaviors for the two conditions. The study also explores the influence of varying load history by subjecting specimens to prefatigue in high cycle fatigue before very high cycle fatigue testing. The results reveal that prior high cycle fatigue damage significantly impacts the fatigue limit under very high cycle fatigue.
MATERIALS PERFORMANCE AND CHARACTERIZATION
(2023)
Article
Thermodynamics
Ojas Satbhai, Suruj Protim Neog, Shyamprasad Karagadde, Indradev Samajdar, Balila Nagamani Jaya, Hemant Kumar, R. Ravikumar, R. Mythili, Chanchal Ghosh, Arup Dasgupta
Summary: This study presents generalised predictive approaches for the prevention of solidification cracks in critical engineering applications. It first uses high-fidelity CFD simulations to compute transient temperature and flow fields in pulsed laser welding, and verifies the temperature field by comparing experimental and numerical weld profiles. Then, it proposes a novel macro-scale computational methodology for in situ numerical estimation of the Crack Vulnerable Index (CVI) based on thermal characteristics. The predictions agree well with experimental findings, indicating that the heat-flow direction is closely related to crack orientations.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2023)
Article
Materials Science, Multidisciplinary
K. G. Raghavendra, Arup Dasgupta, N. S. Karthiselva, K. Jayasankar, Srinivasa Rao Bakshi
Summary: Technologically important Oxide Dispersion-Strengthened steels were synthesized using ZrO2 as a dispersion strengthener instead of conventionally used Y2O3. The material was synthesized using a powder metallurgical route followed by spark plasma sintering. Detailed microstructural characterization revealed a fine-grained microstructure with finer dispersoids in as-sintered and normalized condition. The stable microstructure was retained even after long-term thermal aging trials, indicating the potential superiority of this material over conventional Oxide Dispersion-Strengthened steels. The yield strength was calculated using microstructural parameters and predictive models, showing good agreement. Mechanical property analysis through hardness measurements was correlated with microstructural observations and compared with conventional Oxide Dispersion-Strengthened steels. The results collectively indicate ZrO2 as a potential alternate dispersoid for strengthening steel, with future scope for vast exploration.
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
(2023)
Article
Chemistry, Physical
Partha Kumbhakar, Ashim Pramanik, Shashank Shekhar Mishra, Raphael Tromer, Krishanu Biswas, Arup Dasgupta, Douglas S. Galvao, Chandra Sekhar Tiwary
Summary: Various strategies have been developed to trap photons inside living cells for high-contrast imaging. One such strategy is the use of 3D-printed biomimetic architecture with localized surface plasmon resonance (LSPR) promoter. This study compares optical confinement in natural and 3D-printed photonic architectures and demonstrates that the 3D-printed fish scale with atomically thin quasicrystals (QCs) outperforms other 2D materials in terms of image contrast.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Materials Science, Multidisciplinary
Somesh Chandra, S. Ganesamoorthy, Arup Dasgupta, G. M. Bhalerao, N. V. Chandra Shekar
Summary: We propose a new virtual substrate method for synthesizing large metal oxide nanosheets. Ashless filter paper is used as the novel virtual substrate and combustive oxidation is used as the synthesis route. CuO/MgO with different proportions are chosen as model prototype materials to study synthesis kinetics. The products are characterized using XRD, Raman spectroscopy, and TEM. The method produces polycrystalline nanosheets with a thickness of approximately 3 nm. The growth kinetics for the metal oxide nanosheets are discussed.
Article
Materials Science, Ceramics
B. R. Vaishnavi Krupa, Chanchal Ghosh, Shyam Kanta Sinha, Arup Dasgupta
Summary: The structural transition of monoclinic-Yttria (m-Y2O3) during in-situ annealing is studied using X-ray Diffraction (XRD) and Transmission Electron Microscope (TEM). The phase transition from monoclinic to cubic (m- c) and the growth mechanism of cubic crystallites are discussed through analysis of crystallite size from XRD profiles and strain analysis from High-Resolution Phase Contrast-TEM micrographs using Geometric Phase Analysis (GPA). The coexistence of m-phase and c-phase of Y2O3 is observed up to -850 degrees C during annealing, and at 1000 degrees C, the phase completely transfers to c-Y2O3.
CERAMICS INTERNATIONAL
(2023)
Article
Materials Science, Multidisciplinary
S. Haribabu, C. Sudha, C. P. Paul, V. Srihari, Alphy George, A. Dasgupta, K. S. Bindra
Summary: This article investigates the microstructure development and phase selection in laser additive manufactured Ni-based hardfacing alloy bushes. The as-fabricated bushes exhibit a uniform microstructure with certain eutectic constituents, and Cr-rich borides and carbides were also found.
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
(2023)
Article
Engineering, Chemical
Pradyumna Kumar Parida, Arup Dasgupta, Shubhra Bajpai, T. Sakthivel, R. Mythili
Summary: Oxide dispersion strengthened (ODS) steels, containing Ti and Y2O3, show superior mechanical properties and creep-rupture life compared to modified 9Cr-1Mo (P91) steel. Optimizing the Y2O3 and Ti content in ODS steels governs the size and stoichiometry of the dispersoids, with equal amounts of Ti and Y2O3 resulting in finer and stable dispersoids. Two varieties of ODS alloys with different Ti and Y2O3 contents were synthesized and compared with P91 steel in terms of microstructure and microtexture.
Article
Metallurgy & Metallurgical Engineering
B. Vishwanadh, Chanchal Ghosh, Arup Dasgupta, G. K. Dey, R. Tewari
Summary: Metallic glasses are non-crystalline solids that form when crystal nucleation and growth are fully or partially prevented. The effect of subtle changes in the liquid structure on crystal formation can be studied by examining the short-range order in the glass. The cooling rates also affect the liquid structure, leading to changes in the medium-range order and consequent effects on properties. The changes occurring in a liquid before it transforms into a crystal can be ascertained by examining the medium-range order of the supercooled liquid near the liquid/crystal interface.
TRANSACTIONS OF THE INDIAN INSTITUTE OF METALS
(2023)
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)
