Article
Nanoscience & Nanotechnology
Guotong Zou, Lingying Ye, Jun Li, Zhixin Shen
Summary: The microstructure evolution and superplastic deformation mechanisms of a 2A97 Al-Cu-Li alloy with initial banded grains were studied. Uniaxial superplastic tensile tests were conducted and surface studies were carried out to investigate the deformation mechanisms. The results showed that the banded grains transformed into equiaxed grains during deformation, and the deformation process could be divided into two stages, with intragranular dislocation slip dominating in the primary stage and grain boundary sliding dominating in the secondary stage.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Nanoscience & Nanotechnology
A. Mikhaylovskaya, O. A. Yakovtseva, A. Irzhak
Summary: The superplastic forming technique is used for producing complex shaped lightweight constructions by achieving extremely high plastic deformation mainly through grain boundary sliding. Studies have shown that fine-grained commercial Al-Mg based alloys exhibit unusually weak grain boundary sliding and increased contributions of accommodation mechanisms during the initial stage of superplastic deformation.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Nanoscience & Nanotechnology
Dianguang Liu, Kewei Wang, Ke Zhao, Jinling Liu, Linan An
Summary: This study systematically investigated the tensile creep of 3 mol% Y2O3 stabilized tetragonal ZrO2 ceramics under a DC field. The results showed that the deformation mechanism of the material strongly depended on the current density and applied stress. Exceptionally large uniform elongation can be obtained when the creep is dominated by dislocation accommodated grain-boundary sliding.
SCRIPTA MATERIALIA
(2022)
Article
Geochemistry & Geophysics
Chao Qi, David L. Goldsby
Summary: The study investigates the dislocation creep of ice through deformation experiments, finding that the characteristic exponent n of ice dislocation creep is influenced by grain size and strain rate, and providing two flow laws for modeling different types of ice.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2021)
Article
Nanoscience & Nanotechnology
Hyun-Bin Jeong, Seok-Won Choi, Seok-Hyeon Kang, Young-Kook Lee
Summary: The new high-strength Fe-10Mn-3.5Si steel exhibits superplasticity at lower temperatures, showing different microstructural and deformation features compared to previous superplastic steels, and is suitable for practical applications.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Review
Materials Science, Multidisciplinary
Roberto B. Figueiredo, Megumi Kawasaki, Terence G. Langdon
Summary: The grain size and grain boundary density have significant effects on the flow stress of metallic materials. The Hall-Petch grain refinement strengthening effect, which is a linear relationship to the inverse of the square root of the grain size, has been well-established for more than 70 years. However, grain refinement softening can occur at high homologous temperatures and both effects have been treated separately. Recent research has shown that a general relationship can explain both the Hall-Petch strengthening effect at low temperatures and superplasticity at high temperatures. This review discusses recent advances in structural and mechanical characterization and provides an updated analysis of the relationship between grain size and flow stress.
PROGRESS IN MATERIALS SCIENCE
(2023)
Article
Materials Science, Multidisciplinary
Xuefeng Lu, Wei Zhang, Junqiang Ren, Qing Gao, Hongtao Xue, Fuling Tang, Peiqing La, Xin Guo
Summary: Grain boundary movement is closely related to plastic deformation of materials. In this study, the introduction of carbon atoms formed a highly stable carbon chain network, which greatly enhanced the stability of the grain boundaries and showed strong dislocation pinning capability. The results revealed that an appropriate amount of carbon content increased the yield strength and tensile strength, while excessive carbon content inhibited the generation of dislocations and resulted in a decline in the mechanical properties of the alloy. This research provides a new strategy for grain boundary engineering by introducing non-metallic atoms.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Review
Materials Science, Multidisciplinary
Walaa Abd-Elaziem, Jingke Liu, Nasr Ghoniem, Xiaochun Li
Summary: High-temperature resistant materials are increasingly important in various industries, such as aerospace and automotive, for improving fuel efficiency and reducing CO2 emissions. Metal matrix nanocomposites (MMNCs) formed by adding nanoparticles to metals show promise in enhancing the structural and industrial applications of metals at high temperatures. This review provides a comprehensive understanding of how nanoparticles affect the creep behavior of metals and alloys, including the activation of different creep mechanisms and the contributions of threshold stress and load transfer. It also focuses on the specific influences of nanoparticles on the creep behavior of metals like aluminum, magnesium, titanium, zinc, and solder alloys, and concludes with future prospects in this field.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Nanoscience & Nanotechnology
Zeinab Savaedi, Hamed Mirzadeh, Rouhollah Mehdinavaz Aghdam, Reza Mahmudi
Summary: Shear punch testing was used to evaluate the superplasticity of a hot rolled fine-grained Mg-3Zn-0.5RE-0.5Zr (ZEK300) alloy. The alloy exhibited regions I, II, and III of deformation behavior typical of superplastic materials, with a grain size of 4.5 μm. In region II, the strain rate sensitivity indices of the ZEK300 alloy were determined to be 0.51, 0.48, and 0.41 at temperatures of 350, 400, and 450 degrees C, respectively. The average activation energy of 87.6 kJ mol-1 suggests that grain boundary sliding (GBS) facilitated by grain boundary diffusion is the dominant deformation mechanism.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Materials Science, Multidisciplinary
Morteza Tayebi, Hamidreza Najafi, Said Nategh, Alireza Khodabandeh
Summary: The creep properties of ZK60 alloy and ZK60/SiCw composite were studied after extrusion and precipitation hardening using accelerated creep tests. Different stress exponents were observed for the alloy and composite at low and high stresses, indicating a shift in creep mechanism from grain boundary sliding to dislocation creep. Fracture surface examination showed that cavity nucleation around grain corners and precipitates was the main cause of creep failure.
METALS AND MATERIALS INTERNATIONAL
(2021)
Article
Biochemistry & Molecular Biology
Xiang Xu, Peter Binkele, Wolfgang Verestek, Siegfried Schmauder
Summary: This study investigates the nano-tensile properties and creep behavior of nickel polycrystalline nanopillars through molecular dynamics simulations, analyzing the mechanisms behind the creep behavior by calculating stress exponents, grain boundary exponents, and activation energies. The results show that dislocation creep dominates at high stresses, while grain boundary sliding prevails at lower stresses; vacancy diffusion begins to play an important role in enhancing grain boundary creep when the temperature exceeds 1000 K.
Article
Materials Science, Multidisciplinary
Terence G. Langdon
Summary: In tensile testing, polycrystalline materials usually fail at low total elongations, but under certain conditions, exceptionally high elongations of over 400% can be achieved. This superplastic condition is not only important scientifically, but also has significant industrial applications in superplastic forming operations. This overview traces the historical development of the superplastic effect and summarizes the main characteristics of the superplastic flow process. Severe plastic deformation (SPD) processing has effectively overcome the limitation of producing exceptionally small grain sizes within the submicrometer or nanometer range. The advantages of SPD processing are discussed and illustrated with examples. Additionally, the construction of deformation mechanism maps based on stress, grain size, and temperature combinations is shown as an effective way to display experimental data.
MATERIALS TRANSACTIONS
(2023)
Article
Nanoscience & Nanotechnology
Seok-Hyeon Kang, Hyun-Bin Jeong, Jin-Sung Hong, Young-Kook Lee
Summary: The influence of B on the superplasticity of Fe-6.6Mn-2.0Al alloy was studied using high-temperature tensile testing. The addition of B increased peak stress and apparent activation energy, while decreasing strain rate sensitivity, affecting grain size and phase fraction. The increase in elongation with B addition may be attributed to the finer grains achieved by suppressing dynamic grain growth.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Geochemistry & Geophysics
Filippe Ferreira, Lars N. Hansen, Katharina Marquardt
Summary: The study focuses on the plastic deformation and the role of grain boundaries in olivine deformation. Specific types of grain boundaries created by dislocation activity facilitate grain-boundary sliding. With progressive deformation, there is an increase in abundance of apparently slip-transparent boundaries.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2021)
Article
Materials Science, Multidisciplinary
Weiming Sun, Yue Jiang, Zhihui Zhang, Zhichao Ma, Guixun Sun, Jiangjiang Hu, Zhonghao Jiang, Xiaolong Zhang, Luquan Ren
Summary: The nanoindentation creep behavior and underlying mechanisms of nanocrystalline Ni and Ni-Fe alloy were studied using a new testing method. The continuous creep strain rate and apparent activation volume data were obtained using the continuous stiffness measurement (CSM) technique. The effects of loading rate and stacking fault energy on the nanoindentation creep behavior were analyzed. The study found that the Ni-Fe alloy showed higher creep resistance in the transient regime but lower creep resistance in the steady-state regime compared to Ni. The contact stiffness data obtained by CSM technique can be used to determine the creep stress data.
MATERIALS & DESIGN
(2023)
Article
Materials Science, Multidisciplinary
O. V. Rofman, A. S. Prosviryakov, A. D. Kotov, A. I. Bazlov, P. O. Milovich, Gopalu Karunakaran, A. V. Mikhaylovskaya
Summary: In this research, high-energy ball milling was used to disperse various volume fractions of sub-micron-sized SiCp particles in AA2024 aluminum powder alloy, focusing on powder morphology and milling conditions. Changes in lattice parameters of the matrix alloy were observed after mechanical alloying. Compression testing at elevated temperatures showed sufficient ductility for thermomechanical processing.
METALS AND MATERIALS INTERNATIONAL
(2022)
Article
Chemistry, Physical
M. Esmaeili Ghayoumabadi, A. G. Mochugovskiy, N. Yu Tabachkova, A. Mikhaylovskaya
Summary: This study aimed to improve the superplastic formability of Alloy AA6013 by refining its grain structure and controlling grain growth at elevated temperatures. Minor additions of Y, Sc, and Zr were considered. The results showed that the additions led to a noticeable refinement of the grain structure and the formation of dispersed particles. These effects inhibited recrystallization and dynamic grain growth, resulting in grain refinement and achieving superplasticity in the alloy.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Multidisciplinary
A. D. Kotov, A. G. Mochugovskiy, A. O. Mosleh, A. A. Kishchik, O. V. Rofman, A. V. Mikhaylovskaya
Summary: Minor additions of rare-earth elements have been found to enhance the mechanical properties of aluminum-based alloys by improving precipitation strengthening and increasing resistance to recrystallization. This study investigated the microstructure, mechanical properties, and superplasticity of Al-Mg-Z-Er alloys with varying Mg content. The results showed that an increase in Mg content led to solid solution strengthening and facilitated dynamic recrystallization at high temperatures. The presence of fine L12 precipitates and (Al,Mg)3Er particles resulted in a fine-grained structure and excellent superplastic deformation behavior.
MATERIALS CHARACTERIZATION
(2022)
Article
Materials Science, Multidisciplinary
A. G. Mochugovskiy, A. B. Mukhamejanova, A. D. Kotov, O. A. Yakovtseva, N. Yu Tabachkova, A. Mikhaylovskaya
Summary: The study reveals that pre-straining significantly accelerates the precipitation kinetics of Al-Mn-Mg alloy, increases the number density of quasicrystalline-structured precipitates, and induces a hardening effect after annealing.
Article
Nanoscience & Nanotechnology
Anton D. Kotov, Maria N. Postnikova, Ahmed O. Mosleh, Anastasia Mikhaylovskaya
Summary: This study investigated the effect of Fe content on the microstructure, superplasticity, and post-forming mechanical properties of Ti-Al-Mo-V alloy. The results showed that increasing Fe content promoted recrystallization and fragmentation, leading to accelerated diffusivity. The alloys exhibited high strain rate sensitivity and maximum elongation to failure at a constant strain rate and low temperature. Alloying with Fe increased the post-forming room-temperature tensile strength and decreased ductility. Alloying with 0.5% Fe provided a good combination of superplastic and room-temperature mechanical properties.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Materials Science, Multidisciplinary
Anton D. Kotov, Maria N. Postnikova, Ahmed O. Mosleh, Vladimir V. Cheverikin, Anastasia Mikhaylovskaya
Summary: The paper investigates the effect of 0.5-1.8 wt.% Ni alloying on the superplasticity, microstructural evolution, and dynamic grain growth of two-phase Ti-Al-Mo-V alloys. The results show that an increase in Ni content significantly improves superplasticity, but excessive Ni content leads to a decrease in superplastic properties. The Ti-4Al-3Mo-1V-0.1B alloy with 0.9 wt.% Ni exhibits a good combination of superplastic behavior and room-temperature mechanical properties.
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
Andrey G. Mochugovskiy, Ahmed O. Mosleh, Anton D. Kotov, Andrey V. Khokhlov, Ludmila Yu. Kaplanskaya, Anastasia V. Mikhaylovskaya
Summary: This study focused on the microstructural analysis, superplasticity, modeling of superplastic deformation behavior, and superplastic forming tests of the Al-Mg-Si-Cu-based alloy modified with Fe, Ni, Sc, and Zr. The effect of thermomechanical treatment on particle distribution and deformation behavior was studied. The constitutive model based on Arrhenius and Beckofen equations accurately described and predicted the superplastic flow behavior of the alloy, and the proposed strain rate provided high quality parts with low thickness variation.
Article
Materials Science, Multidisciplinary
Ahmed O. Mosleh, Olga A. Yakovtseva, Anna A. Kishchik, Anton D. Kotov, Essam B. Moustafa, Anastasia V. Mikhaylovskaya
Summary: Friction stir processing (FSP) is a promising technique for refining grains and improving mechanical properties. This study compared an FSP-ed Al-Mg-Sc-Zr alloy with fine nanoscale Al-3(Sc,Zr) precipitates and an alloy modified with both Al-3(Sc,Zr) and coarse Al9FeNi-phase particles. The results showed that both secondary-phase particles and FSP parameters influenced the microstructure, mechanical properties, and superplasticity of the alloys. The modified alloy exhibited an improvement in ultimate tensile strength and elongation-to-fracture compared to the reference alloy, thanks to the effective grain refinement provided by the fine Al-3(Sc,Zr) and coarse Al9FeNi particles.
Article
Nanoscience & Nanotechnology
Anton D. Kotov, Maria N. Postnikova, Ahmed O. Mosleh, Anastasia V. Mikhaylovskaya
Summary: The superplastic deformation behavior, strain-induced microstructure evolution, and post-deformation mechanical properties of Ti-4Al-1V-1Fe-1Ni-0.1B-xMo alloys (x = 1, 2.5, or 5 wt%) were investigated. It was found that 5% Mo content significantly improved the β-phase fraction, m-value, δ-value at low temperature (625°C), as well as the post-forming tensile mechanical properties at room temperature.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Chemistry, Physical
Maria N. Postnikova, Anton D. Kotov, Andrey I. Bazlov, Ahmed O. Mosleh, Svetlana V. Medvedeva, Anastasia V. Mikhaylovskaya
Summary: The decrease of superplastic forming temperature and improvement of post-forming mechanical properties are important issues for titanium-based alloys. This study focuses on the influence of trace amounts of boron on the microstructure and properties of Ti-4Al-3Mo-1V alloys. The addition of 0.01-0.1wt.% boron significantly refines prior beta-grains and improves superplasticity.
Article
Materials Science, Multidisciplinary
V. V. Palacheva, M. Yu. Zadorozhnyy, A. V. Mikhaylovskaya, P. A. Petrov, I. S. Golovin
Summary: Structural-induced anelasticity in AA5051 alloy was analyzed under two different treatment schemes: simple compression and compression combined with torsion. Anelasticity caused by structural transitions was studied using temperature, time, and amplitude-dependent tests. The sample subjected to compression combined with torsion exhibited a higher thermodynamical stimulus for recrystallization and higher dislocation density, resulting in a faster decrease in dislocation density during instant heating and isothermal annealing. The Avrami kinetics parameters for isothermal recrystallization and activation parameters for grain boundary relaxation after recrystallization were calculated.
Article
Metallurgy & Metallurgical Engineering
A. A. Kishchik, S. A. Aksenov, M. S. Kishchik, D. O. Demin, A. Yu. Churyumov, A. V. Mikhaylovskaya
Summary: The effects of isothermal multidirectional forging (IMF) on the grain structure, second-phase particles of solidification origin, and dispersoids in the Al-4.9Mg-0.9Ni-0.9Fe-0.2Zr-0.1Sc alloy were investigated. The results showed that the strain distribution during forging has a significant influence on the alloy properties. A new method for constructing stress-strain curves was proposed to accurately characterize the mechanical behavior of the material. Additionally, increasing the number of phase cycles resulted in a reduction in the size of solidification-origin phase particles and a finer grain structure.
PHYSICS OF METALS AND METALLOGRAPHY
(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)