Article
Materials Science, Multidisciplinary
Lin Wang, Zhuyu Wang, Xin Jia, Chen Chen, Fucheng Zhang, Wei Zhang
Summary: The high-temperature tensile deformation characteristics of a super austenitic stainless steel were systematically investigated at different deformation temperatures and strain rates. The effect of angle between solidification direction and loading direction on hot ductility was studied in detail. The results showed that the hot ductility of the steel was significantly influenced by the angle between solidification direction and loading direction. The microstructure and deformation behavior of the steel were found to be different for samples with different angles.
JOURNAL OF MATERIALS SCIENCE
(2022)
Article
Materials Science, Multidisciplinary
Zhiguo Wang, Fei Gao, Shuai Tang, Chengang Li, Zhenyu Liu
Summary: A series of solution annealing experiments and quasi in-situ observation were conducted to investigate the grain growth behaviors in hot rolled 316H austenitic stainless steel with heterogeneous microstructure. It was found that during high temperature direct heating, grains grew unevenly with size differences, while stepping heating resulted in uniform grain growth and distribution, providing a new idea for regulating grain size in manufacturing heavy austenitic stainless steels.
Article
Materials Science, Multidisciplinary
Matruprasad Rout, Surjya K. Pal, Shiv Brat Singh
Summary: In this study, the microstructure evolution of austenitic stainless steel after deformation at elevated temperatures was investigated through thermo-mechanical processing. The results showed that at temperatures of 900 degrees C and 1000 degrees C, the microstructures of samples held for 2 seconds consisted of deformed grains, while the sample held at 1100 degrees C showed nearly complete recrystallization. The increase in holding time resulted in a decrease in low angle boundaries and an increase in high angle grain boundaries at all three temperatures.
MATERIALS CHEMISTRY AND PHYSICS
(2023)
Article
Chemistry, Physical
Pavel Dolzhenko, Marina Tikhonova, Rustam Kaibyshev, Andrey Belyakov
Summary: The features of discontinuous dynamic recrystallization in a highly-alloyed austenitic stainless steel were studied, showing power law relationships between DRX grain size and dislocation density with temperature-compensated strain rate or peak flow stress. The obtained dependencies suggest a unique power law function between the dislocation density and the DRX grain size.
Article
Materials Science, Multidisciplinary
H. Khorshidi, A. Kermanpur, H. Rastegari, E. Ghassemali, M. C. Somani
Summary: The hot deformation characteristics of a FeCrMnN austenitic stainless steel with 0.28 wt.% nitrogen were investigated through hot compression tests, revealing dynamic recrystallization at high temperatures and regions of unstable flow at low temperatures and high strain rates.
MATERIALS TODAY COMMUNICATIONS
(2021)
Article
Materials Science, Multidisciplinary
Deli Zhao, Liguo Ren, Yong Wang, Wei Wang, Zhe Zhu, Wantang Fu
Summary: This study investigated the mechanical behavior and microstructure evolution of as-cast nuclear grade 321 stainless steel in a certain temperature and strain rate range. The results showed that the suggested hot working window was 1000-1200 degrees C and 0.01-0.1 s(-1), with necklace DRX being the main form of instability.
Article
Chemistry, Physical
Wei Liu, Zhiling Liu, Hua Zhang, Jingjing Ruan, Hailiang Huang, Xin Zhou, Fanchao Meng, Shangzhou Zhang, Liang Jiang
Summary: The deformation behavior and grain size models of FGH4096 superalloy under hot extrusion conditions were investigated. A constitutive equation considering the strain variable and hot working maps were established based on the flow stress curves. The study also analyzed the dynamic recrystallization behaviors and microstructure evolution in different regions and identified the causes of flow instability as wedge cracks, voids, and intergranular cracks. The optimal hot working window and an improved grain size model were determined.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Multidisciplinary
Xin Hu, Chen Chen, Yanguo Li, Zhinan Yang, Fucheng Zhang, Wei Zhang
Summary: This study systematically investigated the microstructure evolution of 7Mo-0.42N contained cast super austenitic stainless steel (SASS) during compression deformation at high temperature. The recrystallization behavior of SASS was found to occur in three stages, and various phenomena such as grain refinement, abnormal growth, and dislocation evolution were observed. Additionally, the nucleation mechanism was found to change with different strain variables.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Materials Science, Multidisciplinary
Shiguang Xu, Jinshan He, Runze Zhang, Fucheng Zhang, Xitao Wang
Summary: The hot deformation behaviors and dynamic softening mechanisms of 7Mo super-austenitic stainless steel were studied. The optimal hot deformation conditions were found to be in the temperature and strain rate ranges of 1030-1200 degrees Celsius and 0.001-0.07 s-1, and 1050-1200 degrees Celsius and 10 s-1, respectively. The high stacking fault energy resulted in planar gliding of dislocations as the main deformation mechanism. Dynamic recovery and continuous dynamic recrystallization played dominant roles in the dynamic softening mechanism. Microbands and sigma precipitates further promoted continuous dynamic recrystallization.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Materials Science, Multidisciplinary
Xin Jia, Lin Wang, Zhuyu Wang, Chen Chen, Fucheng Zhang
Summary: The relaxation time significantly affected the flow behavior and microstructural evolution of the test steel. The number of deformation passes and relaxation time exert an important influence on the deformation mechanism of SASS.
JOURNAL OF MATERIALS SCIENCE
(2022)
Article
Materials Science, Multidisciplinary
Guosheng Sun, Miaomiao Zhao, Linxiu Du, Hongyan Wu
Summary: The grain size of a 304 austenitic stainless steel was tuned through deformation-induced martensite transformation and austenite reversion annealing, and the effects of grain size on mechanical properties and deformation mechanisms were studied. Grain refinement significantly increased yield strength and elongation, while enhancing martensitic transformation. The formation of carbide precipitation and the change of martensite nucleation sites were attributed to the effects of grain size.
MATERIALS CHARACTERIZATION
(2022)
Article
Metallurgy & Metallurgical Engineering
Ni Ke, Yang Yinhui, Cao Jianchun, Wang Liuhang, Liu Zehui, Qian Hao
Summary: The study found that during the hot compression deformation of stainless steel, the ferrite phase mainly undergoes dynamic recrystallization (DRX), with the degree of grain refinement increasing with strain rate. Substituting nickel with manganese can alter the stability of the austenite phase, affecting the recrystallization mechanisms. Different types of dynamic recrystallization can be induced by varying temperature and strain rate.
ACTA METALLURGICA SINICA
(2021)
Article
Nanoscience & Nanotechnology
Marcos Natan da Silva Lima, Guilherme Luis Franca Schmalz, Rodrigo de Carvalho Paes Loureiro, Joao Carlos Ferreira, Samuel Filgueiras Rodrigues, Jessica Calvo Munoz, Jose Maria Cabrera Marrero, Hamilton Ferreira Gomes de Abreu
Summary: An experimental TWIP steel was deformed under hot torsion tests at different total equivalent strains. The effects of torsional deformation on the microstructure, texture, and mechanical properties were investigated. It was found that the main deformation mechanism changed from conventional sliding to nucleated twinning. The best balance between strength and ductility was achieved after a total equivalent strain of 2.6.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Metallurgy & Metallurgical Engineering
H. R. Rezaei Ashtiani, A. A. Shayanpoor
Summary: The study revealed that the critical stress and strain decrease with increasing temperature and decreasing strain rate during hot compression tests of pure copper, leading to dynamic recovery, dynamic recrystallization, and twinning mechanisms. Additionally, the initial grain size influences microstructural evolution and grain growth during hot deformation.
ACTA METALLURGICA SINICA-ENGLISH LETTERS
(2022)
Article
Crystallography
Huaying Li, Lihong Gao, Yaohui Song, Lidong Ma, Haitao Liu, Juan Li, Guanghui Zhao
Summary: The study on the thermal compression simulation of antibacterial stainless steel containing copper revealed that the dynamic recrystallization mechanism is discontinuous, while the growth of twins relies on recrystallization. An Arrhenius model considering strain compensation was established for flow stress, achieving high accuracy with a correlation coefficient of 0.979 and an average relative absolute error of 7.066%.
Article
Engineering, Mechanical
Mohammad Javad Sohrabi, Hamed Mirzadeh, Saeed Sadeghpour, Reza Mahmudi
Summary: The mechanical behavior and martensite formation of austenitic steels have been studied in relation to grain size. It was found that there is a significant change in mechanical properties and transformation-induced plasticity (TRIP) effect in the transition grain size range of 34 to 90 μm. Increasing grain size promotes the formation of deformation-induced martensite, but suppresses it at coarser grain sizes.
INTERNATIONAL JOURNAL OF PLASTICITY
(2023)
Article
Nanoscience & Nanotechnology
Sara Mohammadzehi, Hamed Mirzadeh, Mohammad Javad Sohrabi, Milad Roostaei, Reza Mahmudi
Summary: The study examined the evolution of mechanical properties in an AISI 316L austenitic stainless steel during cold rolling using unidirectional and cross-rolling routes. It was found that cross-rolling with a low thickness reduction of 25% resulted in the formation of higher amounts of strain-induced martensite and dislocation density, leading to a strong combination of transformation strengthening and work hardening effects. At a high thickness reduction of 75%, both rolling routes showed comparable strengthening effects, but cross-rolling exhibited less pronounced directionality of mechanical properties. The study proposed an alternative method for evaluating anisotropy in cold rolled sheets and demonstrated the potential of cross-rolling in enhancing mechanical properties, preserving equiaxed structure, and reducing anisotropy and directionality compared to unidirectional rolling.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Materials Science, Multidisciplinary
Milad Maleki, Fatemeh Jamei, Massoud Emamy, Hamed Mirzadeh
Summary: The effects of nickel addition to magnesium in the hypoeutectic range were examined in the as-cast and extruded conditions. The results showed that at low nickel content (5 wt-%), grain-boundary eutectics were present in the refined alpha-Mg matrix, while at high nickel content (15 wt-%), the eutectic constituent became the matrix of the alloy with the appearance of alpha-Mg rosettes. The addition of nickel up to 15 wt-% significantly improved the strength-ductility balance. Moreover, the formation of long Mg2Ni particles at the boundaries of eutectic colonies was explained based on the cooling curve thermal analysis results. Additionally, the remarkable grain refinement through dynamic recrystallisation (DRX) and fragmentation/dispersion of intermetallic particles during hot extrusion resulted in improved tensile strength, ductility, and toughness.
MATERIALS SCIENCE AND TECHNOLOGY
(2023)
Article
Engineering, Civil
Mohammad Javad Sohrabi, Hamed Mirzadeh, Saeed Sadeghpour, Abdol Reza Geranmayeh, Reza Mahmudi
Summary: The sequential TWIP and TRIP effects were induced in a commercial AISI 304L stainless steel by tailoring the average austenite grain size. Grains refinement promoted the TWIP effect, while grain coarsening enhanced the TRIP effect.
ARCHIVES OF CIVIL AND MECHANICAL ENGINEERING
(2023)
Review
Materials Science, Multidisciplinary
Zeinab Savaedi, Reza Motallebi, Hamed Mirzadeh, Rouhollah Mehdinavaz Aghdam, Reza Mahmudi
Summary: This overview article reviews the superplastic behavior of medical magnesium alloys. It discusses the basics of superplasticity and superplastic forming via grain boundary sliding (GBS). The properties of biomedical Mg alloys are tabulated. The critical discussion focuses on the superplasticity of biocompatible Mg-Al, Mg-Zn, Mg-Li, and Mg-RE alloys, emphasizing the influence of grain size, hot deformation temperature, and strain rate on tensile ductility.
CURRENT OPINION IN SOLID STATE & MATERIALS SCIENCE
(2023)
Article
Nanoscience & Nanotechnology
Mohammad Javad Sohrabi, Hamed Mirzadeh, Saeed Sadeghpour, Reza Mahmudi
Summary: The study examined the effects of nucleation site and morphology of deformation-induced martensite on the work-hardening behavior of TRIP-assisted austenitic stainless steel with different austenite grain sizes. It was found that the nucleation site of a'-martensite changed from grain boundaries to interior regions of deformed grains, and the morphology changed from blocky to film-like with increasing grain size. The formation of film-like a'-martensite on shear bands and their intersections resulted in higher work-hardening rate compared to blocky a'-martensite formed on grain boundaries.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Review
Materials Science, Multidisciplinary
Mohammad Saleh Geshani, Parastoo Mahmoud Kalayeh, Amir Hossein Asadi, Hamed Mirzadeh, Mehdi Malekan, Massoud Emamy
Summary: Due to their excellent mechanical properties, magnesium alloys with long-period stacking ordered (LPSO) structures have gained significant attention. This overview article reviews the atomic structures, formation mechanisms, transformations, and morphology of LPSO phases in various Mg-based systems, as well as the effects of thermomechanical processing and severe plastic deformation techniques on the grain refinement and dispersion of LPSO phases. Furthermore, the application of friction stir processing and friction stir welding for LPSO-containing Mg alloys in terms of microstructural evolution, mechanical properties, and strengthening mechanisms is critically discussed. Future suggestions include studying the kinetics of LPSO phase formation, exploring emerging processing technologies, evaluating processing parameters, characterizing recrystallization mechanisms, and investigating superplasticity during hot deformation of LPSO-containing Mg alloys.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Materials Science, Multidisciplinary
Amir Hossein Asadi, Parastoo Mahmoud Kalayeh, Hamed Mirzadeh, Mehdi Malekan, Massoud Emamy
Summary: In this study, the microstructures, mechanical properties during tensile deformation, and precipitation kinetics of Mg95.5Y3Zn1.5 and Mg95.5Y3Ni1.5 magnesium alloys were compared. The investigation revealed that the peak aging treatment led to the formation of lamellar 14H-LPSO phase in Mg95.5Y3Zn1.5 alloy and bMODIFIER LETTER PRIME-Mg7Y particles in Mg95.5Y3Ni1.5 alloy, resulting in improved ultimate tensile strength and total elongation. The analysis of formation kinetics indicated that the activation energy for phase transformation was different for the two alloys.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Engineering, Civil
Mohammad Javad Sohrabi, Hamed Mirzadeh, Milad Roostaei, Oliver Renk, Abdol Reza Geranmayeh, Reza Mahmudi
Summary: The effects of cold rolling, subsequent continuous heating, and aging on the microstructure and tensile properties of AISI 904L superaustenitic stainless steel were studied. Cold rolling led to high strength but reduced ductility in subsequent tensile testing. Recrystallization and fine grain size were observed upon continuous heating, accompanied by the precipitation of fine Cr-Mo-rich sigma-phase. Grain refinement during thermomechanical processing significantly improved the yield stress, but deviations from the Hall-Petch relation were observed due to the precipitation of intragranular sigma-phase, affecting the elongation to failure.
ARCHIVES OF CIVIL AND MECHANICAL ENGINEERING
(2023)
Review
Materials Science, Multidisciplinary
Mohammad Reza Zamani, Milad Roostaei, Hamed Mirzadeh, Mehdi Malekan, Min Song
Summary: This study investigates the relationship between the parameters of cold rolling and annealing process, interstitial element content, and their interactions in the processing and grain refinement of interstitial-containing high-entropy alloys (HEAs). Machine learning models and mathematical relationships are proposed to guide the design and prediction of the microstructure and properties of HEAs.
CURRENT OPINION IN SOLID STATE & MATERIALS SCIENCE
(2023)
Article
Materials Science, Multidisciplinary
Aria Afsharnaderi, Mehrab Lotfpour, Ahmad Bahmani, Hamed Mirzadeh, Mehdi Malekan, Massoud Emamy, Mojtaba Fatehi Mollayousef, Soraya Bornay Zonoozi
Summary: The synergetic effect of strontium (Sr) and rare earth elements (RE) on the corrosion properties of as-cast Mg-9Al-1Zn alloy were investigated. The addition of 0.5 wt-% RE and 0.5 wt-% Sr (RE/Sr ratio of 1) significantly reduced the corrosion rate of AZ91. This was attributed to the modification of the β-Mg17Al12 phase and the formation of proper amounts of Al11RE3 and Al4Sr intermetallics, which minimized the micro-galvanic corrosion. However, an excessive RE/Sr ratio impaired the corrosion resistance, possibly due to the excess amounts of Al11RE3 and Al4Sr intermetallics causing micro-galvanic effect.
MATERIALS SCIENCE AND TECHNOLOGY
(2023)
Article
Nanoscience & Nanotechnology
Mohammad Javad Sohrabi, Hamed Mirzadeh, Saeed Sadeghpour, Reza Mahmudi
Summary: The yielding of deformation-induced martensite leads to the decrease of work-hardening rate and restrains the strengthening effect of strain-induced martensitic transformation and tensile ductility.
SCRIPTA MATERIALIA
(2023)
Article
Metallurgy & Metallurgical Engineering
Saeed Deldar, Hamed Mirzadeh, Mohammad Habibi Parsa
Summary: This study investigates the microstructure and mechanical properties of a low-alloy Cu-bearing TRIP steel and their dependence on the processing history. It is found that the distributions of retained austenite and bainite are influenced by the initial cold-rolled microstructure, which can be controlled by hot-rolling route and cooling rate. The mechanical properties and TRIP effect are strongly influenced by the initial microstructure, and the addition of copper improves the amount of retained austenite and strength-ductility balance.
STEEL RESEARCH INTERNATIONAL
(2023)
Article
Materials Science, Multidisciplinary
Sajedeh Valeh, Hamed Mirzadeh, Milad Roostaei, Mohammad Javad Sohrabi
Summary: In this study, the effects of Ti microalloying and thermomechanical processing on the recrystallization behavior and mechanical properties of type 316 stainless steel were investigated. The presence of Ti and TiC carbides were found to play important roles in grain refinement. Annealing resulted in the formation of fine-grained microstructures and improved mechanical properties.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Materials Science, Multidisciplinary
Mohammad Javad Sohrabi, Hamed Mirzadeh, Saeed Sadeghpour, Reza Mahmudi
Summary: This study compares the kinetics of alpha'-martensite formation in the ultrafine-grained (UFG) and coarse-grained regimes using AISI 304L stainless steel. The results show that the simple JMAK-type model, which considers the dependency of the volume fraction of alpha'-martensite on the strain, can effectively model the experimental data, predict nucleation sites based on theoretical Avrami exponents, and characterize the transformation kinetics at low and high strains.
IRANIAN JOURNAL OF MATERIALS SCIENCE AND ENGINEERING
(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)
