Article
Engineering, Mechanical
J. Geathers, C. J. Torbet, J. W. Jones, S. Daly
Summary: Water vapor has a significant impact on the small fatigue crack growth rates in Ti-6242S alloy, with a linear dependence observed between crack growth rate and water vapor pressure. This work highlights the importance of humidity in determining fatigue life even at high cyclic frequencies.
INTERNATIONAL JOURNAL OF FATIGUE
(2022)
Article
Engineering, Mechanical
Jundong Wang, Hao Lu, Zhixun Wen, Yeda Lian, Zhenwei Li, Zhufeng Yue
Summary: In this study, the fatigue mechanical properties of TC4 titanium alloy at different temperatures were investigated, and a method to predict the fatigue life of TC4 at different temperatures was established. The proposed model was verified to have reasonable accuracy with the test results.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2022)
Article
Nanoscience & Nanotechnology
Motoki Sakaguchi, Yoshinori Niwa, Wenxiang Gong, Keisuke Suzuki, Hirotsugu Inoue
Summary: The study found that at high temperatures, the fatigue crack growth resistance of the triplex microstructure is significantly increased, mainly due to the higher volume fraction of ductile p phase. Meanwhile, the fatigue crack growth threshold in different microstructures and temperatures is almost comparable and shows the same temperature dependency.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Engineering, Mechanical
S. Hemery, J. C. Stinville
Summary: This study monitored the microstructurally small crack growth in Ti-6Al-4V and Ti-6Al-2Sn-4Zr-2Mo with equiaxed and bimodal microstructures. The influence of microstructure on the lifetime variability observed in Ti alloys was evaluated, and primary alpha grains, basal plane cracking, and misalignment across boundaries were identified as key features for high crack growth rates. Dwell periods were found to induce significant small crack acceleration.
INTERNATIONAL JOURNAL OF FATIGUE
(2022)
Article
Nanoscience & Nanotechnology
Abdul Khadar Syed, Xiang Zhang, Alec E. Davis, Jacob R. Kennedy, Filomeno Martina, Jialuo Ding, Stewart Williams, Philip B. Prangnell
Summary: The influence of three different deposition strategies on the fatigue crack growth behavior of WAAM Ti-6Al-4V was studied. The oscillation build exhibited the lowest crack growth rates and behaved more similarly to an annealed microstructure compared to the other two deposition strategies.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Nanoscience & Nanotechnology
Hang Lv, Zhenlin Zhang, Yarong Chen, Yan Liu, Hui Chen, Yong Chen, Jing Cheng, Jian She, Huabing He, Jintao Chen
Summary: In this study, several large Ti-6Al-4V blocks were fabricated successfully using high-power laser metal deposition (HP-LMD). The high cycle fatigue (HCF) property and fatigue crack growth (FCG) behavior of the as-built Ti-6Al-4V alloy were investigated in horizontal and vertical directions. The results showed that the HCF performance of the vertical specimens was superior to the horizontal specimens, but inferior to the wrought Ti-6Al-4V. Additionally, the fatigue crack growth rate of the vertical specimens was lower than that of the horizontal specimens.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Engineering, Multidisciplinary
Bin -Bin Zhuang, Yu-Xin Liu, Yan-Nan Du, Ming-Liang Zhu, Fu-Zhen Xuan
Summary: Comparisons were made among different evaluation models of fatigue crack growth in codes, standards, and guidelines, highlighting the significance of the transition point for accuracy. A new bilinear model with full consideration of the transition point and fatigue threshold was established and found to be more accurate than existing codes and standards for evaluating fatigue crack growth behavior in both the Paris and near-threshold regimes.
INTERNATIONAL JOURNAL OF PRESSURE VESSELS AND PIPING
(2022)
Article
Mechanics
Jiahui Cong, Jiayuan Gao, Song Zhou, Naijing Wang, Jiahao Wang, Hui Li
Summary: This study investigates the effect of ultrasonic rolling on the fatigue resistance of laser-welded joints in Ti6Al4V titanium alloy. It is found that ultrasonic rolling treatment significantly enhances the fatigue life of the samples, with the number of rolling passes showing a positive correlation with the fatigue life increase. The treatment also leads to changes in crack propagation paths and decreases the width of fatigue striations, indicating an improvement in fatigue life. The enhancement in fatigue performance is attributed to changes in residual stress, microstructure, microhardness, and surface quality.
ENGINEERING FRACTURE MECHANICS
(2023)
Article
Materials Science, Multidisciplinary
Jiarui Liu, Jiawei Chen, Zhengyi Sun, Haicheng Zhang, Qingsong Yuan
Summary: This article investigates the fatigue crack closure in a new titanium alloy using a combination of simulation method and experiments under constant amplitude cyclic loading. A numerical simulation is conducted to analyze the effect of grid size on the crack closure level and obtain the fatigue crack opening load level under different load ratios. Experimental study demonstrates that the fatigue crack growth rate of the new titanium alloy is affected by the stress ratio, with an increase in load ratio leading to a higher crack expansion rate.
Article
Chemistry, Physical
Junqiang Ren, Qi Wang, Binbin Zhang, Dan Yang, Xuefeng Lu, Xiaobo Zhang, Xudong Zhang, Jingyu Hu
Summary: The study found that the microstructure (bimodal and lamellar structure) of the Ti-6Al-3Nb-2Zr-1Mo alloy has an impact on the fatigue crack growth rate, with the lamellar structure exhibiting slower crack growth rate and more tortuous paths. The frequency of crack deflection and bifurcation is higher in lamellar structure compared to bimodal structure.
Article
Engineering, Mechanical
Jiacai Zhu, Jiafen Cao, Wanlin Guo
Summary: Fatigue is a major threat to structural integrity, and its reliability analysis is important and challenging due to uncertainties in material quality, manufacturing quality, and service load. This study proposes a reliability analysis method that considers these uncertainties. It obtains the distribution of equivalent initial crack sizes in the material using a three-dimensional fatigue crack growth prediction. The analysis is based on a randomly combined sample set of applied stresses and crack sizes, assuming independence. The method effectively reduces the number of samples and provides reliable probability of different fatigue life intervals.
INTERNATIONAL JOURNAL OF FATIGUE
(2023)
Article
Engineering, Mechanical
Anastasios G. Gavras, Anthony G. Spangenberger, Diana A. Lados
Summary: A study was conducted on the long and small fatigue crack growth mechanisms of various light structural aluminum and titanium alloys, leading to the development of a predictive model for microstructurally controlled small fatigue crack growth behavior, which agrees well with experimental data.
INTERNATIONAL JOURNAL OF FATIGUE
(2021)
Article
Engineering, Mechanical
Katelyn Jones, William D. Musinski, Adam L. Pilchak, Reji John, Paul A. Shade, Anthony D. Rollett, Elizabeth A. Holm
Summary: This study utilized computer vision and machine learning techniques to predict qualitative characteristics and quantitative values of Ti-6Al-4V fracture surfaces from fatigue crack growth tests. The study found that Convolutional Neural Networks (CNNs) focused on different features based on the length scale of the image, and also determined a lower limit field of view and confirmed the effectiveness of transfer learning.
INTERNATIONAL JOURNAL OF FATIGUE
(2023)
Article
Engineering, Mechanical
Giancarlo Luis Gomez Gonazles, Jose Manuel Vasco-Olmo, Fernando Antunes, Diogo M. Neto, Francisco A. Diaz
Summary: This study experimentally evaluates the plastic component of the crack-tip opening displacement (CTODp) to characterize the fatigue crack growth behavior in a Grade 2 titanium sample under single overload with constant amplitude loading conditions. The results show that there is a linear correlation between CTODp and fatigue crack growth rates, indicating the independence of this relationship to load-interaction effects. Therefore, CTODp can be considered as a suitable crack-driving parameter for studying crack propagation behavior under variable amplitude loading, with the fatigue crack growth process primarily caused by cyclic plastic deformation.
INTERNATIONAL JOURNAL OF FATIGUE
(2023)
Article
Engineering, Mechanical
K. S. Ravi Chandran, Sarah E. Galyon Dorman
Summary: A specimen-size-effect was found in the experimental fatigue crack growth behavior. The net-section-based fracture mechanics approach provided a unique correlation of the fatigue crack growth data for all specimen sizes, using the change in net-section strain energy as the crack driving force parameter. The inclusion of an effective specimen length in the driving force calculations, determined by shear-lag analysis, led to extremely well-correlated fatigue crack growth data.
INTERNATIONAL JOURNAL OF FATIGUE
(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)