Article
Materials Science, Multidisciplinary
Wenhao Pan, Huabei Peng, Yangyang Du, Jie Chen, Jiazhen Yan, Yuhua Wen
Summary: This study investigated the microstructures and shape memory effect (SME) of cast Fe-Mn-Si-CrNi alloys with four solidification modes. Ferritic-austenitic and ferritic modes introduced more stacking faults, reducing stress-induced critical martensite stress. Thus, the former solidification modes displayed better SME than the latter solidification modes.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Materials Science, Multidisciplinary
Chengjun Wang, Wujie Zu, Hao Wang, Yang Wang
Summary: By performing ab initio simulations, the ground state properties and generalized stacking fault energy (GSFE) of gamma-Fe-Mn alloys with different Mn concentrations were investigated. It was found that Mn atoms have a significant short-range effect on the intrinsic stacking fault energy (ISFE), and the relationship between ISFE and Mn atom concentration of antiferromagnetic (AFM) Fe-Mn alloys can be explained by the cohesive energy and density of states (DOS) of the alloys. Additionally, AFM was shown to increase the ISFE of gamma-Fe-Mn alloys compared to non-magnetic (NM) alloys, highlighting the importance of considering magnetic interactions in ISFE calculations.
METALS AND MATERIALS INTERNATIONAL
(2021)
Article
Materials Science, Multidisciplinary
Jaime A. Castaneda, Oscar A. Zambrano, German A. Alcazar, Sara A. Rodriguez, John J. Coronado
Summary: A critical assessment was conducted to determine the stacking fault energy (SFE) of the austenite phase in high manganese steels using X-ray diffraction (XRD), revealing a substantial variation in SFE with chosen elastic constants, leading to potential errors of up to 37%. The study aimed to establish a more direct and reliable methodology for calculating SFE by XRD, and found that uncertainty in elastic constants can significantly impact the estimated values.
Article
Chemistry, Physical
D. H. Chung, W. C. Kim, S. Y. Baek, M. H. Kim, Y. S. Na
Summary: In this study, a series of novel medium-entropy alloys (MEAs) were developed based on a thermodynamic approach, and one of the alloys was found to exhibit excellent strength and ductility at cryogenic temperatures. Experimental assessment and thermodynamic modeling quantitatively demonstrated the strength-ductility synergy derived from the interplay among plasticity mechanisms. Additionally, a model was proposed for evaluating the stacking fault energy of the alloys.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Nanoscience & Nanotechnology
Tomoya Nagira, Terumi Nakamura, Fumiyoshi Yoshinaka, Takahiro Sawaguchi, Yasuhiro Aoki, Masayoshi Kamai, Hidetoshi Fujii, Akihisa Takeuchi, Masayuki Uesugi
Summary: In this study, the dendrite-scale microstructural evolution of Fe-Mn-Si alloys during TIG spot welding was observed using high-spatial resolution X-ray imaging and diffraction. The solidification mode was found to significantly influence the susceptibility to solidification cracking.
SCRIPTA MATERIALIA
(2022)
Article
Nanoscience & Nanotechnology
Yu Wang, Yunlai Deng, Qingsong Dai, Keda Jiang, Jiqiang Chen, Xiaobin Guo
Summary: Two high Fe containing Al-Mg-Si-Mn-Fe alloys were prepared and compared with a common applied alloy in terms of microstructures and mechanical properties. The alloys showed a good combination of strength and elongation, mainly due to precipitation and solid solution strengthening from appropriate proportions of Mg and Si elements.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Materials Science, Multidisciplinary
Christian Wagner, Alberto Ferrari, Jurgen Schreuer, Jean-Philippe Couzinie, Yuji Ikeda, Fritz Koermann, Gunther Eggeler, Easo P. George, Guillaume Laplanche
Summary: The physical properties of ten single-phase FCC CrxMn20Fe20Co20Ni40-x high-entropy alloys were investigated. The lattice parameters of the alloys were nearly independent of composition, while the solidus temperatures increased linearly with increasing Cr content. The alloys did not exhibit ferromagnetism in a certain temperature range, and the temperature dependencies of their coefficients of thermal expansion and elastic moduli were independent of composition. Ab initio simulations qualitatively reproduced the magnetic transitions and magnetostriction observed in the alloys. The plastic deformation of the alloys was found to occur initially by the glide of perfect dislocations on {111} planes. The stacking fault energy (SFE) was determined and found to decrease with increasing Cr content. However, the calculated intrinsic SFEs were lower than the experimental values. The ab initio simulations showed that atomic relaxations, finite temperatures, and magnetism strongly influenced the intrinsic SFE.
Article
Physics, Fluids & Plasmas
D. Pena Lara, H. Correa, Daniel Suescun Diaz
Summary: In this study, the magnetic properties and thermodynamical description of the Fe-Mn-Al ternary alloy were investigated using the BC model. The results showed that the BC model with antiferromagnetic next-nearest-neighbor coupling accurately fit the experimental data and the predicted phase diagram considering the crystalline field was significantly improved compared to traditional models.
Article
Materials Science, Multidisciplinary
T. Riaz, S. Shyamal, S. K. Shee, L. P. Karjalainen, P. Sahu
Summary: The influence of Al content on the deformation microstructure of high-Mn steels was investigated by incorporating the dislocation induced strain anisotropy through X-ray line profile analyses. Epsilon-martensite was only detected in the steel without any Al, while deformation twinning and dislocation substructures were observed in steels containing 1 wt% and 3 wt% Al, respectively. The population of screw dislocations increased with increasing Al content.
MATERIALS CHARACTERIZATION
(2023)
Article
Materials Science, Multidisciplinary
Hyo Ju Bae, Kwang Kyu Ko, Muhammad Ishtiaq, Jung Gi Kim, Hyokyung Sung, Jae Bok Seol
Summary: Assessing the stacking fault forming probability (P-sf) and stacking fault energy (SFE) in medium- or high-Mn base structural materials can anticipate and elucidate the microstructural evolution before and after deformation. The influence of carbon-doping contents on the structural properties of Fe-17Mn-xC steels and the relationship with SFE were investigated using atom probe tomography and transmission electron microscopy. The results showed that high carbon doping increased SFE and had an inverse relationship with the width of localized stacking faults.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2022)
Article
Engineering, Mechanical
Le Li, Zhenghao Chen, Koretaka Yuge, Kyosuke Kishida, Haruyuki Inui, Martin Heilmaier, Easo P. George
Summary: The plastic deformation behavior of equiatomic Cr-Fe-Co-Ni medium-entropy alloy was investigated through compression and tension experiments. The critical resolved shear stress (CRSS) for {111}<1((1)over bar)0> slip was found to be 44-45 MPa at room temperature without significant tension-compression asymmetry. The CRSS increased rapidly with decreasing temperature, but the temperature dependence dulled below 77 K due to the inertia effect. The 0 K CRSS was determined to be 200 MPa, higher than Cr-Mn-Fe-Co-Ni high-entropy alloy but lower than Cr-Co-Ni medium-entropy alloy.
INTERNATIONAL JOURNAL OF PLASTICITY
(2023)
Article
Materials Science, Multidisciplinary
Na Yan, Delu Geng, Bingbo Wei
Summary: The influence of cooling rate on the damping performance and martensitic transformation mechanism of Fe-17%Mn alloy was investigated. It was found that rapid solidification was beneficial for the formation of ε-martensite and the improvement of damping capacity.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2022)
Article
Materials Science, Multidisciplinary
Dong Lang, Xuefei Huang, Weigang Huang
Summary: The microstructure and mechanical properties of Fe-0.6C-15Mn steels with Cr and Si co-alloying were investigated. The results showed that the strength and elongation of the steels increased significantly with the Cr contents. The 6Cr(3Si) steel exhibited the maximum yield strength, tensile strength, elongation, and impact toughness. The study also found that the Cr and Si co-alloying improved the work hardening capability of the high-Mn steels.
JOURNAL OF MATERIALS SCIENCE
(2023)
Article
Nanoscience & Nanotechnology
W. X. Zhang, Y. Z. Chen, L. Zhou, T. T. Zhao, W. Y. Wang, F. Liu, X. X. Huang
Summary: Si is a common alloying element in Al alloys, mainly used to form precipitates and improve castability. In this study, the effect of Si as a solute on work hardening and dislocation behaviors of Al-Si alloys was investigated. It was found that the addition of Si increased the tensile strength and ductility of the alloys, with higher Si concentrations resulting in greater improvements. The enhanced work hardening was attributed to the change in dislocation configuration and the weakening of stacking-fault energy.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Nanoscience & Nanotechnology
H. B. Peng, J. B. Zhang, L. X. Sun, F. Song, X. G. An, H. Wang, Y. H. Wen
Summary: The shape memory effect of Fe-Mn-Si-Cr-Ni-C shape memory alloys can be significantly improved by aging after pre-strain. However, the effect of aging time on the shape memory effect under a large deformation-strain is not evident.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
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)