Article
Chemistry, Physical
Rajiv Kumar, R. K. Singh Raman, S. R. Bakshi, V. S. Raja, S. Parida
Summary: The present study investigates the oxidation behavior of nanocrystalline (NC) and microcrystalline (MC) Fe-20Cr-5Al alloys at 900 degrees C. The results show that nanocrystallization reduces the Al requirement for the formation of a protective Al2O3 layer, leading to a significantly lower oxidation rate compared to microcrystalline alloy. Additionally, the microcrystalline alloy exhibits a higher weight gain than the nanocrystalline alloy.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Metallurgy & Metallurgical Engineering
Linshuo Dong, Feiyang Wang, Hong-Hui Wu, Mengjie Gao, Penghui Bai, Shuize Wang, Guilin Wu, Junheng Gao, Xiaoye Zhou, Xinping Mao
Summary: This study evaluated the influence of Cr element on the hydrogen embrittlement resistance of nanocrystalline Fe-Cr alloys under different hydrogen concentrations and strain rates, and found that Cr segregation played an important role in improving material strength and plasticity as well as inhibiting hydrogen-induced cracking.
ACTA METALLURGICA SINICA-ENGLISH LETTERS
(2023)
Article
Materials Science, Multidisciplinary
Peng Wang, Wen Qi, Kun Yang, Yingjie Qiao, Xiaodong Wang, Ting Zheng, Chengying Bai, Zhen Liu, Xiaohong Zhang
Summary: This study investigated the effect of the Cr/Al ratio on the microstructure and steam oxidation behavior of Fe-Cr-Al alloys. It was found that the oxidation process can be divided into two steps, and the surface-oxidizing film was dominated by submicron grain-sized Al2O3, with its thickness increasing with the Cr or Al ratio. Alloys with a high Cr or Al ratio exhibited a rapid formation of a surface-oxidizing film, which acted as a passivation layer to reduce the water molecule diffusion rate.
Article
Nanoscience & Nanotechnology
Sebastian Lech, Wojciech Polkowski, Adelajda Polkowska, Grzegorz Cempura, Adam Kruk
Summary: The study of Ni-Fe-Cr-Al alloy revealed the presence of three different phases in the discontinuous precipitation zone, as well as discussed the development of multiple discontinuous reactions.
SCRIPTA MATERIALIA
(2021)
Article
Nanoscience & Nanotechnology
Xun Xiao, Jiadong Zuo, Yaqiang Wang, Kai Wu, Jinyu Zhang, Gang Liu, Jun Sun
Summary: This study investigates the effect of sputtering power on the microstructure and mechanical properties of nanocrystalline Cr coatings prepared by magnetron sputtering. The experimental results show that increasing the sputtering power leads to changes in surface morphology and grain size, as well as an increase in hardness and elastic modulus. The size-dependent strengthening behavior can be explained using the classical Hall-Petch theory.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Materials Science, Multidisciplinary
Amanda Leong, Qiufeng Yang, Samuel W. McAlpine, Michael P. Short, Jinsuo Zhang
Summary: FeCrSi alloys are proposed as alternatives to FeCrAl alloys for accident-tolerant fuel cladding in light water reactors and exhibit good oxidation resistance, with >= 16% Cr content being sufficient to form a passivating oxide layer. Among the three Fe-Cr-2Si alloys tested, Fe20Cr2Si showed the best oxidation resistance in high-temperature steam conditions.
Article
Materials Science, Multidisciplinary
Aashique A. Rezwan, Daniel Schwen, Yongfeng Zhang
Summary: This study presents a modeling investigation on concurrent grain growth and radiation-induced segregation (RIS) in austenitic Fe-Cr-Ni. The results show that grain growth significantly affects RIS in terms of increasing grain size and motion of grain boundaries as defect sinks. Additionally, RIS in nanocrystalline materials induces grain-level compositional redistribution, resulting in grain-size-dependent compositions in individual grains. These findings highlight the different effects of RIS in nanocrystalline alloys compared to coarse-grained counterparts.
JOURNAL OF NUCLEAR MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
S. Choi, E. Choi, W. J. Kim
Summary: The study demonstrates that different combinations of recovery stress and recovery strain can be achieved by controlling grain size. The recovery stress and strains are also influenced by the accumulated plastic strain, with higher levels observed when the strain is small due to the training effect, and reduced levels when the strain is large from repeated cycles. Additionally, the higher recovery stress in the HRDSR-processed higher-carbon Fe-SMA compared to the present Fe-SMA is attributed to the smaller grain size caused by the presence of a higher density of carbides.
MATERIALS CHARACTERIZATION
(2021)
Article
Chemistry, Physical
Lin Wang, Quanqing Zeng, Zhibao Xie, Yun Zhang, Haitao Gao
Summary: The oxidation behavior of a 3D laser printed equimolar Cr-Mn-Fe-Co high-entropy alloy was studied at high temperatures, showing that the oxidation kinetics followed parabolic rate law and the oxide layer thickness increased with experimental temperature or time. Exfoliation of the oxide layer occurred at 900 degrees C. The loose structures formed during oxidation tests significantly affected the high-temperature oxidation resistance of the HEA.
Article
Metallurgy & Metallurgical Engineering
M. K. Anirudh, M. Sreenidhi Iyengar, P. H. Anantha Desik, M. P. Phaniraj
Summary: In this study, predictive modeling of cyclic oxidation behavior of different alloys was conducted using the machine learning algorithm CatBoost, achieving high accuracy. The results showed that the CatBoost algorithm can not only predict the mass change of alloys after cyclic oxidation, but also accurately predict whether they will form protective oxide scale, oxidize rapidly, or undergo spallation.
OXIDATION OF METALS
(2022)
Article
Nanoscience & Nanotechnology
Yuchu Wang, Bita Ghaffari, Christopher Taylor, Simon Lekakh, Mei Li, Yue Fan
Summary: The study investigates the energy and activation barrier distributions of Cr atoms in austenitic alloys across various chemical and microstructural environments. By utilizing a physics-based machine learning algorithm, the thermodynamic and kinetic behaviors of Cr atoms can be reliably predicted based on local electronegativity and free volume of local atomic packing. The findings have the potential to guide the design of austenitic alloys with desired properties.
SCRIPTA MATERIALIA
(2021)
Article
Materials Science, Multidisciplinary
F. Ozdemir, C. S. Witharamage, J. Christudasjustus, A. A. Darwish, H. Okuyucu, R. K. Gupta
Summary: Nanocrystalline Al-Fe alloy, produced by high-energy ball milling, exhibits uniform microstructure and high solid solubility of Fe. It shows high hardness and corrosion resistance, attributed to the nanocrystalline structure and formation of solid solution. The incorporation of Fe to the surface film and Fe enrichment at the alloy/surface film interface enhance the corrosion performance.
Review
Physics, Applied
Jifeng Zhou, Junhua You, Keqiang Qiu
Summary: Fe-based amorphous/nanocrystalline alloys exhibit excellent soft magnetic properties and can be used in distribution transformers, transformers, reactors, and other devices. They are also green, energy-saving, and environmentally friendly.
JOURNAL OF APPLIED PHYSICS
(2022)
Article
Materials Science, Multidisciplinary
Hu Li, Anding Wang, Tao Liu, Pingbo Chen, Aina He, Qiang Li, Junhua Luan, Chain-Tsuan Liu
Summary: A revolutionary nanostructure design concept was proposed in this study to improve the magnetic properties of Fe-based alloys by preforming dense nuclei and refining nano-structure via transient metalloid-rich interfaces. A novel alloy composition with superior magnetic properties was developed using only 4.6 wt.% light metalloids, showing great potential as a substitute for commercial bulk Si-steels in soft-magnetic applications.
Article
Materials Science, Coatings & Films
Zhiwei Wang, Teng Wu, Juanjian Ru, Yixin Hua, Jiaojiao Bu, Ding Wang
Summary: Nanocrystalline Fe-Cr alloy coatings were prepared using electrodeposition in a deep eutectic solvent, with variations in cell voltage and temperature. The obtained coatings exhibited dense and uniform microscopic morphology, with excellent corrosion resistance under specific voltage and temperature conditions.
SURFACE & COATINGS TECHNOLOGY
(2021)
Article
Nanoscience & Nanotechnology
Ahmad Mirzaei, Peter D. Hodgson, Xiang Ma, Vanessa K. Peterson, Ehsan Farabi, Gregory S. Rohrer, Hossein Beladi
Summary: This study investigated the influence of parent austenite grain refinement on the intervariant boundary network in a lath martensitic steel. It found that refining the parent austenite grain led to a decrease in the fraction of certain boundaries in the martensite and an increase in the connectivity of low energy boundaries, ultimately improving the impact toughness.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
N. L. Church, C. E. P. Talbot, L. D. Connor, S. Michalik, N. G. Jones
Summary: Metastable beta Ti alloys based on the Ti-Nb system have attracted attention due to their unique properties. However, the unstable cyclic behavior of these alloys has hindered their widespread industrial use. Recent studies have shown that internal stresses, including those from dislocations, may be responsible for this behavior. This study demonstrates that inter-cycle thermal treatments can mitigate the unstable cyclic behavior, providing a significant breakthrough in our understanding of Ti-Nb superelastic materials.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Di Zhao, Chenchen Zhao, Ziyang Xiu, Jiuchun Yan
Summary: This study proposes a novel strategy for achieving the bonding of SiC ceramic and Al alloy using ultrasound. The ultrasound promotes the dissolution of Al into the solder, activating the solder and triggering the interfacial reaction between SiC ceramic and solder. With increasing ultrasonic duration, the bonding between SiC and Al transitions from partial to full metallurgical bonding.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Kang Du, Yang Zhang, Guangda Zhao, Tao Huang, Liyuan Liu, Junpeng Li, Xiyu Wang, Zhongwu Zhang
Summary: This paper systematically investigated the evolution of microstructure in Fe-Ni-Co-Al polycrystalline alloys and its effects on mechanical properties. The results revealed that the migration of grain boundaries in different processes is driven by different factors, which impacts the grain orientation and precipitate formation. In the process of directional recrystallization, grains with specific orientations grow in the grain boundary region and form the dominant orientation, while grains with lower migration rate form the minor orientation. The alloy produced through directional recrystallization exhibited good recoverable strain and superelastic strain, while the alloy produced through solid solution treatment showed no evident superelastic behavior.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Edohamen Awannegbe, Liang Chen, Yue Zhao, Zhijun Qiu, Huijun Li
Summary: This study employed laser metal deposition to additively manufacture Ti-15Mo wt% alloy, and subsequently subjected it to post-fabrication uniaxial thermomechanical processing. The results showed that different zones in the microstructure remained after processing, and deformation mechanisms mainly involved slip and martensite formation. The compressive mechanical properties were found to be dependent on strain rate, with higher flow stress and compressive strength observed at higher strain rates. Grain structure homogenisation was not achieved, leading to anisotropic tensile properties.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Reza Khatib Zadeh Davani, Enyinnaya George Ohaeri, Sandeep Yadav, Jerzy A. Szpunar, Jing Su, Michael Gaudet, Muhammad Rashid, Muhammad Arafin
Summary: This research aims to investigate the effect of roughing and finishing reductions on crystallographic texture. The results show significant heterogeneity in the centerline region, with higher intensity of certain textures. Drop Weight Tear Test indicates that steel specimens with lower and medium reductions exhibit superior low-temperature impact toughness compared to steel with higher reductions. The electrochemical hydrogen charging experiments confirm the presence of internal hydrogen cracks only in steel with lower and medium reductions.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Flavio De Barbieri, Denis Jorge-Badiola, Rodrigo Allende, Karem Tello, Alfredo Artigas, Franco Perazzo, Henry Jami, Juan Perez Ipina
Summary: This study examines the effect of Cr additions on the mechanical behavior of TWIP steel at temperatures ranging from 25°C to 350°C. The results indicate that different temperature-dependent strengthening mechanisms, including mechanical twinning, Dynamic Strain Aging, and slip bands, are at play. The stacking fault energy (SFE) influences the percentage of mechanical twinning, which in turn affects the strain hardening rate.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Hanlin Peng, Siming Huang, Ling Hu, Bingbing Luo, Liejun Li, Ian Baker
Summary: This study explores the weldability, microstructures, and mechanical properties of two L1(2)-nanoparticle-strengthened medium-entropy alloys after electron beam welding (EBW). The results show that strong yet ductile defect-free joints were produced, with larger grain sizes in the fusion zones compared to the heat-affected zones and base materials. Both EBWed MEAs exhibited high yield strengths, high ultimate tensile strengths, and good fracture strains at 77 K. The V-doping improved the cryogenic mechanical properties of the TMT MEA.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Yongxin Wang, Lei Chen, Lizi Shao, Shuo Hao, Motomichi Koyama, Xingzhou Cai, Xiaocong Ma, Miao Jin
Summary: This study investigated the tensile deformation behavior of an Mn-N bearing lean duplex stainless steel with metastable austenite. The results showed that the strain rate had significant influence on the work hardening, strain-induced martensitic transformation, and fracture mechanism.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Jong Woo Won, Seulbi Lee, Hye-Jeong Choe, Yong-Taek Hyun, Dong Won Lee, Jeong Hun Lee
Summary: Cold-rolled pure titanium showed improved sheet formability after undergoing cryogenic-deformation treatment. This treatment increased the thinning capability of the titanium and suppressed cracking during sheet forming. The formation of twins during deformation contributed to high thinning capability and increased strength through grain refinement and dislocation accumulation.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Handong Li, Lin Su, Lijuan Wang, Yanbin Jiang, Jiahui Long, Gaoyong Lin, Zhu Xiao, Yanlin Jia, Zhou Li
Summary: Homogenization heat treatment is a key procedure in controlling the second phase, enhancing composition uniformity, and workability of as-cast Cu-15Ni-8Sn alloy. This study found that electropulsing treatment (EPT) can significantly reduce treatment temperature and time, improve elongation and overall mechanical properties of the alloy.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Yuxuan Wang, Juntao Zou, Lixing Sun, Yunfei Bai, Zhe Zhang, Junsheng Cheng, Lin Shi, Dazhuo Song, Yihui Jiang, Zhiwei Zhang
Summary: A novel mechanical-heat-electricity synergistic method was proposed to enhance the mechanical properties of Cu-15Sn-0.3Ti alloy by forming annealing twins (ATs). The combination method of Rotary swaging (RS) and Electric pulse treatment (EPT) successfully induced recrystallization and refinement of the microstructure, leading to a significant increase in the strength of the alloy within a short time.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Zhiyi Ding, Jiangtao Xie, Tong Wang, Aiying Chen, Bin Gan, Jinchao Song
Summary: This study demonstrated the Ta-induced strengthening of CoCrNi-AlTi MEAs using nanoscale heterogeneous coherent precipitates. The addition of Ta and aging treatments significantly enhanced the mechanical properties of the alloy, including yield strength, ultimate tensile strength, and elongation.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Z. Y. You, Z. Y. Tang, B. Wang, H. W. Zhang, P. Li, L. Zhao, F. B. Chu, H. Ding
Summary: The mechanical properties and microstructural evolution of C-doped TRIP-assisted HEA under dynamic loading conditions were systematically investigated in this study. The results showed that dynamic tensile deformation led to an increase in yield strength and a decrease in ultimate tensile strength, with a trend towards increased total elongation. The primary deformation mechanisms shifted from TRIP and TWIP effects to deformation twinning and dislocations. The presence of carbides formed through C-doping hindered dislocation slip and promoted the activation of multiple twinning systems.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Feng Qin, Feihu Chen, Junhua Hou, Wenjun Lu, Shaohua Chen, Jianjun Li
Summary: Plastic instability in strong multilayered composites is completely suppressed by architecting nanoscale BCC Nb crystalline-amorphous CuNb interfaces.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)