Article
Mechanics
Longbiao Li
Summary: A micromechanical temperature-dependent vibration damping model of fiber-reinforced ceramic matrix composites (CMCs) is developed in this paper. The temperature-dependent damage mechanisms and theoretical relationships between composite damping and temperature are established. Analysis of the effects of composite constituent properties and damage state on temperature-dependent composite vibration damping are conducted.
COMPOSITE STRUCTURES
(2021)
Article
Chemistry, Physical
Yufeng Liu, Longbiao Li, Zhongwei Zhang, Xiang Xiong
Summary: This study investigated the monotonic and cyclic loading/unloading tensile behavior of four different 3D needle-punched C/SiC composites, revealing that an increase in fiber volume fraction results in higher initial tangent modulus, tensile strength, and fracture strain, while decreasing unloading residual strain, peak strain, hysteresis width, and hysteresis area in the composite materials.
Article
Engineering, Mechanical
Longbiao Li
Summary: A micromechanical approach was developed to predict crack opening displacement (COD) of fiber-reinforced ceramic-matrix composites under tensile loading, considering matrix fragmentation and fiber/matrix interface debonding. Relationships between composite constituent properties, COD, and matrix fragmentation were established, and the effects of various factors on crack behavior were analyzed, providing insights into the mechanisms governing crack initiation and propagation in such composite materials.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2021)
Article
Engineering, Mechanical
Longbiao Li
Summary: A cyclic-dependent vibration damping model for fiber-reinforced ceramic-matrix composites (CMCs) is developed in this study to investigate the effects of cyclic-dependent damage mechanisms under cyclic fatigue loading. By analyzing the influence of different applied cycle numbers and vibration stresses on material vibration damping, it is concluded that the cyclic-dependent composite vibration damping increases with the increasing cycle numbers.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART C-JOURNAL OF MECHANICAL ENGINEERING SCIENCE
(2021)
Article
Engineering, Aerospace
Longbiao Li
Summary: This study investigated the time-dependent deformation and damage tendencies of fiber-reinforced ceramic-matrix composites under stress-rupture loading at average environmental temperatures. The effects of various factors on the performance of SiC/SiC were analyzed, with results showing that increasing fiber volume can extend stress-rupture lifetime, while increasing constant peak stress levels and environmental temperatures can decrease the lifetime.
JOURNAL OF AEROSPACE ENGINEERING
(2021)
Article
Materials Science, Composites
Longbiao Li
Summary: This paper investigates the characterization of cyclic fatigue hysteresis loops of CMCs using internal damage mechanisms. It is found that loading/unloading inverse tangent modulus can be used as an effective tool to monitor the fatigue damage evolution and fracture of composites.
JOURNAL OF COMPOSITE MATERIALS
(2022)
Article
Engineering, Mechanical
Longbiao Li
Summary: In this paper, a systematic approach was developed to estimate the constituent properties of SiC/SiC composite using hysteresis-based damage parameters. Four different cases were considered for the hysteresis analysis. The effects of various factors on the damage parameters were analyzed. Experimental hysteresis loops were characterized to estimate the composite's constituent properties.
INTERNATIONAL JOURNAL OF FATIGUE
(2023)
Article
Engineering, Manufacturing
Yuekai Yan, Hui Mei, Minggang Zhang, Zhipeng Jin, Yuntian Fan, Laifei Cheng, Litong Zhang
Summary: This paper investigates the interfacial bonding issue in continuous fiber 3D printed ceramics and proposes a method to control the interface through chemical vapor infiltration. Experimental results show that controlling the interface and filling the fiber bundles can improve the mechanical properties of ceramic materials.
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
(2022)
Article
Materials Science, Multidisciplinary
Longbiao Li
Summary: This paper presents a micromechanical fatigue life prediction method for fiber-reinforced ceramic-matrix composites subjected to stochastic overloading, characterizing fatigue damage mechanisms using different models. Relationships between fatigue life, degradation rate, overloading stress, and breakage of intact fibers are established. Experimental fatigue life of different C/SiC composites under various stochastic overloading conditions is predicted, showing variations in fatigue life degradation rates among different composite materials.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART L-JOURNAL OF MATERIALS-DESIGN AND APPLICATIONS
(2021)
Article
Chemistry, Physical
Zhongwei Zhang, Longbiao Li, Zhaoke Chen
Summary: The tensile damage and fracture behavior of carbon fiber reinforced silicon carbide (C/SiC) minicomposites with single- and multiple-layer interphases are investigated in this paper. The damage evolution process of the C/SiC minicomposite can be divided into four main stages, eventually leading to composite failure/fracture, with a large number of fibers pulling out of the samples observed on the fracture surface.
Article
Materials Science, Ceramics
Longbiao Li
Summary: The study investigates the damage evolution and lifetime of fiber-reinforced ceramic-matrix composites under stress rupture loading, considering relationships between stochastic loading stress, frequency, time, interface debonding and oxidation length, fiber failure probability, and stress rupture lifetime. Analysis of the effects of stochastic loading stress and time, fiber volume, matrix crack spacing, interface debonding energy, interface shear stress, and temperature on composite strain and lifetime is conducted.
JOURNAL OF THE AUSTRALIAN CERAMIC SOCIETY
(2021)
Article
Materials Science, Composites
Longbiao Li
Summary: This paper investigates the strain response of SiC/SiC composite under stress-rupture with stochastic load at intermediate temperatures. Multiple damage mechanisms and micromechanical damage models are considered to predict the strain response and internal damage evolution. The effects of stochastic stress level, material properties, damage state, and environment temperature on composite's performance are discussed.
JOURNAL OF COMPOSITE MATERIALS
(2021)
Article
Materials Science, Composites
Longbiao Li
Summary: This paper investigates stress-dependent matrix multiple fractures of fiber-reinforced ceramic-matrix composites, discussing the effects of various factors on crack evolution, interface debonding, and oxidation behavior. The study combines shear-lag model with fiber oxidation and fracture models to determine micro-stress field of damaged composites.
COMPOSITE INTERFACES
(2021)
Article
Materials Science, Ceramics
Xiaojun Guo, Jinwu Wu, Jian Li, Yuqi Zeng, Xiaozhong Huang, Longbiao Li
Summary: This paper investigates the tensile damage and fracture of 2D SiC/SiC composites, attributing nonlinear damage and fracture to matrix cracking, interface debonding, and fibers fracture mechanisms. Different peak stresses lead to hysteresis loops and changes in natural frequency and composite modulus under cyclic loading/unloading. A micromechanical model is used to predict the tensile curves, with interface debonding ratio and broken fibers fraction characterizing the damage and fracture. Relationships among natural frequency, composite modulus, interface debonding, and fibers fracture are established. The AE signal is concentrated in specific stress ranges corresponding to matrix cracking and fiber fracture, indicating different failure mechanisms.
Review
Engineering, Manufacturing
Xinyuan Lv, Fang Ye, Laifei Cheng, Litong Zhang
Summary: Whisker-reinforced ceramic matrix composites (CMCs) are emerging materials for structural applications at high temperatures. This review presents a composite preparation route that allows for scalability and industrialization. It discusses the sequential preparation of whisker, whisker preform, interphase, and matrix, and the different synthesis methods and morphology control mechanisms of whiskers (SiCw, Si3N4w, Al2O3w). Directions for future development are also proposed.
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
(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)