Article
Materials Science, Multidisciplinary
Zhe Li, Liang Wang, Binbin Wang, Zhaobo Li, Zhiwen Li, Yong Zhang, Liangshun Luo, Ruirun Chen, Yanqing Su, Jingjie Guo
Summary: The oxidation behavior of TiNbMo0.5Al0.225Six refractory high entropy alloys with different Si contents (x = 0.1, 0.25, 0.4, 0.55) was studied at 1000 degrees C. Increasing Si content was found to improve oxidation resistance and lower oxidation rates. The beta-(Nb, Ti)(5)Si-3 phase exhibited excellent oxidation resistance, while the region with gamma-(Nb, Ti)(5)Si-3 phase was prone to porosity generation.
Article
Nuclear Science & Technology
Chuan Liu, Zhi Cai, Hui Xiao, Kai Wang, Quan Yuan, Jianxin Wang
Summary: Based on experimental measurement, an axisymmetric finite element model was established to simulate the residual stress in nickel-based alloy overlaid stainless-steel narrow-gap girth weld. Numerical simulations were then conducted to study the effects of the size of the overlay on the residual stress. The results showed that increasing the overlay height increased the depth of the hoop compressive stress, while decreasing the range of the axial compressive stress distribution. Increasing the overlay width also increased the depths of both the hoop and axial compressive stress, but the depth of the hoop compressive stress remained unchanged after reaching a critical value.
NUCLEAR ENGINEERING AND DESIGN
(2023)
Article
Materials Science, Multidisciplinary
Max D. A. Valentine, Vimal Dhokia, Joseph Flynn, Sophie A. M. McNair, Alexander J. G. Lunt
Summary: The concentration and size of oxides and precipitate inclusions in Additively Manufactured (AM) components greatly affect their strength and fracture toughness. These features are sensitive to powder production parameters and the number of times a powder has been reused. This study used synchrotron X-ray powder diffraction to analyze the growth rates and distribution of oxides and precipitates as temperature changes. The results showed differences in residual strain and provided insights on the material properties and build reliability of AM parts.
MATERIALS TODAY COMMUNICATIONS
(2023)
Article
Engineering, Mechanical
Vinay Kumar Yadav, Vidit Gaur, I. Singh
Summary: The study found that the complexity in microstructure and tensile residual stress in the weld zone significantly influenced the fatigue behavior of the welded joints. Increase in tensile residual stresses led to an apparent increase in mean stresses, reducing fatigue lives. Re-appearance of hardening precipitates after heat-treatment improved fatigue lives in the welded joints.
INTERNATIONAL JOURNAL OF FATIGUE
(2022)
Article
Materials Science, Multidisciplinary
Zhongliang Zhu, Yuyang Li, Chenhao Ma, Xueying Liu, Guangkui Liu, Shuo Wang, Hong Xu, Naiqiang Zhang
Summary: The corrosion tests of Inconel 740 H in supercritical water showed that weight gain increased with exposure time and temperature, oxidation kinetics followed parabolic law, and temperature had a significant impact on oxide phase composition. The study also discussed the mechanism of oxidation proceeding through outward chromium transport based on oxygen isotope profile.
Article
Materials Science, Multidisciplinary
Bin Wang, Li Zhou, Jigong Du, Yunshuo Cao
Summary: Residual stress has a significant impact on the performance of welded joints, with tensile residual stress easily leading to joint fracture and failure. A three-dimensional nonlinear transient thermo-mechanically coupled finite element model was established to predict and verify the influence of welding parameters on temperature and residual stress evolution in Ti62A alloy electron beam welding with filler wire. The findings indicate that high tensile stress in the heat affected zone can induce joint failure, and lower groove angles and multi-layer welding can effectively reduce residual stress and improve joint performance.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Materials Science, Multidisciplinary
Mary Taylor, Rengen Ding, Paul Mignanelli, Mark Hardy
Summary: This study presents the oxidation kinetics of a nickel-based superalloy over a temperature range of 700-850 degrees C and finds that the presence of (Ti,Nb,Ta)(N,C,B) precipitates positively affects the kinetics. The dissolution of the precipitates at high temperatures leads to an increase in oxidation kinetics.
Article
Materials Science, Multidisciplinary
Jianping Xu, Chengze Liu, Jinping Wu, Huan Li, Boyi Qi, Di Zhang, Yusheng Zhang, Yongqing Zhao, Lian Zhou
Summary: The effect of microscale residual stresses on the initial corrosion behavior of Ti35 alloys in boiling nitric acid solutions was investigated. It was found that the concentration of residual stresses accelerated the dissolution of the alloys, but the formation of oxide films prevented the corrosion medium from reaching the surface of the alloys, reducing the effect of residual stresses on corrosion.
Article
Nanoscience & Nanotechnology
Ruslan M. Karimbaev, Young-Sik Pyun, Auezhan Amanov
Summary: The beneficial effect of ultrasonic nanocrystal surface modification (UNSM) treatment on the mechanical properties and fatigue performance of Nickel-base 718 alloy fabricated by laser directed energy deposition (LDED) process was investigated in this study. The treatment demonstrated a significant enhancement in fatigue performance by introducing high compressive residual stress (CRS) and generating a nanostructured surface layer. Additionally, it was found that surface roughness decreased and hardness increased after the treatment.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Materials Science, Multidisciplinary
Jian Xu, Jing Nong, Fengrui Liang, Sui Yuan, Lu Ren, Qi Guo, Tetsuo Shoji
Summary: This study investigated the effects of hydrogen charging on the oxide film of Ni, Cr, and Alloy 690 in high-temperature water. The results showed that hydrogen charging caused amorphization in the inner layer of Cr, thinning of the oxide film in Ni, and the presence of cavities along the boundary of inner oxide and matrix. The oxide film of Alloy 690 exhibited a mixed feature of Ni and Cr. The diffusion of hydrogen into the solution not only affected the thermal stability of the oxide film but also hindered the precipitation of outer oxide.
Article
Chemistry, Inorganic & Nuclear
Wei Yang, Licheng Sun, Zhengyu Mo, Min Du, Jingjing Bao, Qiang Zhao
Summary: Direct liquid fuel cells (DLFCs) are a promising technology for clean energy conversion, but their widespread application is limited by the high cost of platinum-group-metal catalysts and unsatisfactory electrode performance. In this study, a low-cost and stable electrode was constructed through a simplified pathway, which exhibited high oxidation current densities and satisfactory stability in alkaline media.
INORGANIC CHEMISTRY COMMUNICATIONS
(2023)
Article
Engineering, Mechanical
Omar S. Salih, Hengan Ou, Wei Sun
Summary: This study developed a novel three-dimensional fully coupled thermo-mechanical finite element model based on the Coupled Eulerian-Lagrangian approach to simulate the friction stir welding (FSW) process. The model successfully captured the evolution of temperature, plastic deformation, and residual stresses and was validated with experimental testing. The results revealed that the tool rotation speed significantly influenced temperature evolution and plastic deformation, with higher plastic deformation resulting in improved weld quality.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2023)
Article
Crystallography
Benjamin Wahlmann, Dominik Leidel, Matthias Markl, Carolin Koerner
Summary: In this study, established hot cracking models were investigated for the development of crack-resistant nickel-base superalloys with a high gamma ' volume fraction for additive manufacturing. Four cracking models were implemented, and alloys were designed based on each cracking criterion using CALPHAD-based Scheil calculations. The cracking mechanisms were found to differ significantly depending on the process temperature, and correlation analysis showed no clear positive correlation between measured crack densities and modeled cracking susceptibilities.
Article
Materials Science, Coatings & Films
Weibing Dai, Ce Zhang, Ziyi Wang, Changyou Li, Zhenghong Yao, Yimin Zhang
Summary: This study analyzed the stress and displacement of the coating and substrate of the micro-arc oxidation coated aluminum alloy, exploring the effect of interlayer and substrate yielding on their constructive relations. The yielding of the interlayer resulted in the displacement of the coating being lower than that of the substrate. The study provided a theoretical basis for residual stress relaxation and the closure of cracks on the coating surface.
SURFACE & COATINGS TECHNOLOGY
(2021)
Article
Materials Science, Multidisciplinary
Micheal Kattoura, Gopal B. Viswanathan, Seetha R. Mannava, Dong Qian, Vijay K. Vasudevan
Summary: The study found that at elevated temperatures and slow strain rates, ATI 718Plus exhibits oxygen-induced intergranular cracking as a failure mechanism, while increasing the strain rate helps to improve ductility and change the fracture mode.
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
(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)