Article
Engineering, Mechanical
Hanqing Liu, Jun Song, Haomin Wang, Chuanli Yu, Yaohan Du, Chao He, Qingyuan Wang, Qiang Chen
Summary: The crack initiation mechanism of TC17 alloy joints with heterogeneous microstructures was studied under stress ratio of 0.1, revealing the impact of slip deformation in beta grains and cracking of coarse grain boundaries. The average diameter of intergranular welding pores related to VHCF crack nucleation is measured to be around 36 μm, with a driving force of -1.66 MPa·m(1/2) governing the transition from HCF to VHCF.
INTERNATIONAL JOURNAL OF FATIGUE
(2022)
Article
Engineering, Mechanical
Z. Liang, A. Liu, X. S. Wang, N. Q. Zhang
Summary: This study investigated the small fatigue crack initiation and propagation behavior of Inconel 617 using various methods, and quantitatively measured the local micro-scale strain field of the material with a new technique. A simulation model was established and a new framework was constructed for predicting crack path and lifetime.
INTERNATIONAL JOURNAL OF FATIGUE
(2022)
Article
Materials Science, Multidisciplinary
C. Zhao, X. Li
Summary: The study characterized deformation of two iron-based alloys, Nitronic 60 and Tristelle 5183, using push-release bend testing, HR-EBSD, and HR-DIC methods. The results showed that high GND densities contributed to work hardening and high residual elastic strain accumulation, while heterogeneous grain/carbide size distribution led to stress concentration, causing carbide decohesion and brittle fracture of the sample.
EXPERIMENTAL MECHANICS
(2021)
Article
Nanoscience & Nanotechnology
J. Bouquerel, C. Schayes, J. B. Vogt
Summary: Complementary mesoscopic investigations were conducted on a notched specimen made of Fe-3%Si steel subjected to fatigue loading. Results showed that DIC and EBSD measurements indicated local strain localization, while dislocation structures evolution observed by ECCI confirmed the variation of strain levels as moving away from the notch. This combination of techniques emphasized local deformation qualitatively and quantitatively.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Materials Science, Multidisciplinary
Conghui Liu, Rhys Thomas, Tianzhu Sun, Jack Donoghue, Xun Zhang, Tim L. Burnett, Joao Quinto da Fonseca, Michael Preuss
Summary: In this study, the relationship between plastic slip activity and fatigue crack initiation was investigated in a near-alpha titanium alloy. The findings showed that plasticity at low stress levels was dominated by basal slip and two types of cracking were observed parallel to basal slip traces. Detailed analysis revealed the mechanisms behind the crack initiation, such as out-of-plane Burgers vector activity and crystallographic facet formation. A new parameter was developed based on the geometric factors to predict transgranular surface crack initiation sites.
Article
Materials Science, Multidisciplinary
Abdalrhaman Koko, Thorsten H. Becker, Elsiddig Elmukashfi, Nicola M. Pugno, Angus J. Wilkinson, James Marrow
Summary: Understanding the local fracture resistance of microstructural features is crucial for the microstructure-informed design of materials. This study presents a novel approach to evaluate stress intensity factors directly from experimental measurements, using high-resolution electron backscatter diffraction. An exemplar study is conducted on a quasi-static crack propagating on low index {hkl} planes in a (001) single crystal silicon wafer.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2023)
Article
Engineering, Mechanical
Aleksandra Krolicka, Grzegorz Lesiuk, Krzysztof Radwanski, Roman Kuziak, Aleksandra Janik, Rafal Mech, Tomasz Zygmunt
Summary: The research shows that the bainitic and pearlitic rails do not exhibit significant differences in fatigue performance. Both materials have similar fatigue crack growth rates and fracture mechanisms, with differences observed in the type of fracture in the final fracture region. Further studies should consider other functional properties such as abrasive wear resistance and rolling contact fatigue when comparing the two materials.
INTERNATIONAL JOURNAL OF FATIGUE
(2021)
Article
Nanoscience & Nanotechnology
Shigeto Yamasaki, Hirofumi Matsuo, Tatsuya Morikawa, Masaki Tanaka
Summary: This paper proposes a method for obtaining microscopic and localized stress-strain curves by combining strain measurements using the digital image correlation (DIC) method with stress measurements using high-resolution electron backscattered diffraction (HR-EBSD). By applying georeferencing to DIC strain maps and HR-EBSD stress maps measured in a deformation-interrupted microstructure, a dataset containing 11 steps of stress-strain information in a single subset was created. This analysis allows for obtaining local stress-strain curves and strain energy maps of polycrystalline nickel alloys. A comparison of the stress-strain curves obtained from any subset in the map reveals that these curves show extremely diverse shapes depending on the location in the microstructure.
SCRIPTA MATERIALIA
(2023)
Article
Metallurgy & Metallurgical Engineering
Naoya Ihara, Takashi Iwamoto, Kimihiro Nishimura
Summary: The crack propagation behavior of nitrocarburized JIS SCM420 steel was studied in a rotational bending fatigue test, with a focus on crack stagnation behavior. It was found that the crack clearly stagnated at the fatigue limit of 400 MPa and the stagnated position corresponded to the critical depth between the hardened and unhardened regions formed by nitrocarburizing. The crack stagnation can be explained by the plastic-induced closure mechanism.
ISIJ INTERNATIONAL
(2023)
Article
Mechanics
Yan Zhao, Dianyin Hu, Qicheng Liu, Rongqiao Wang, Jianguang Bao
Summary: This paper developed a real-time and non-destructive method for tracing 2D fatigue crack propagation. By introducing an optimized digital image correlation approach and algorithms, the crack length can be measured and monitored accurately, and the results showed good consistency with simulation results. The proposed method has promising industrial applications.
ENGINEERING FRACTURE MECHANICS
(2022)
Article
Materials Science, Multidisciplinary
Duncan W. MacLachlan, Vasilis Karamitros, Fionn P. E. Dunne
Summary: This paper proposes an engineering approach to the problem of fatigue crack initiation at the microstructural scale. The initiation of fatigue cracks is broken down into separate processes, and a fundamental approach to modelling these processes has been developed. The method successfully correlates with fatigue data for a specific material.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2023)
Article
Engineering, Mechanical
Hang Liang, Rui Zhan, Dongpo Wang, Caiyan Deng, Xiaohan Xu, Baichen Guo
Summary: This study conducted a series of comparative fatigue crack growth rate (FCGR) tests on S355J2W+N steel to investigate the crack retardation/acceleration effects caused by overload/underload and explore the corresponding mechanisms. The results showed that single overload, single underload, and periodic underloads could influence crack propagation cycles to different degrees. The changes in crack closure and residual stress state near the crack tip were determined to be the main factors causing crack retardation or acceleration.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2022)
Article
Engineering, Mechanical
Qinan Han, Wei Wang, Jianwen Fang, Haitao Cui, Hongjian Zhang, Xiaolin Yang, Qinqin Mu, Jian Xu, Huiji Shi
Summary: This work conducted in-situ scanning electron microscope (SEM) fretting fatigue experiments using dovetail shape specimens to study the failure of the turbine blade-disc dovetail joint in aero-engines. The study captured the fretting fatigue damage process and quantified the misorientation and geometrically necessary dislocation (GND) density induced by fretting fatigue.
INTERNATIONAL JOURNAL OF FATIGUE
(2022)
Article
Materials Science, Multidisciplinary
Xiu-Yang Fang, Jian-En Gong, Wei Huang, Jia-Hong Wu, Jun-Jun Ding
Summary: The fatigue crack growth-rate test of U71Mn welded rail's rail head, waist, and bottom material was conducted. Digital image correlation (DIC) was employed to capture full-field displacement, accurately determining crack-tip position and identifying a measurement point for accurate crack-tip opening displacement (CTOD). CTOD values of the welded rail head were extracted under overloaded and unloaded conditions, obtaining the area sizes of elastic CTOD and plastic CTOD. Based on COD data and the Elber model, the corresponding crack opening force was determined and a calculation method for effective stress-intensity factors (SIFs) considering plasticity-induced crack closure was proposed. The results of this study provide valuable references for accurately assessing the fatigue life of welded rails.
Article
Chemistry, Physical
Jose Manuel Vasco-Olmo, Alonso Camacho-Reyes, Giancarlo Luis Gomez Gonzales, Francisco Diaz
Summary: This work uses the CJP model to investigate the plasticity-induced shielding effects on growing fatigue cracks and characterize the size and shape of the plastic zone. By analyzing displacement fields measured experimentally, the study successfully contributes to a better understanding of the shielding effects during fatigue crack growth.
Review
Crystallography
Yan Huang, Jun Jiang
Summary: A von Mises criterion states that five independent slip systems are required for polycrystals to deform uniformly and without failure. However, this criterion has fundamental flaws as there is no evidence to support the simultaneous operation of five independent slip systems. This paper reexamines the von Mises criterion and the Taylor model, and addresses the fundamental issues related to the requirement of independent slip systems and the selection of active slip systems.
Article
Materials Science, Multidisciplinary
Wei Wang, Daniel S. Balint, Amir A. Shirzadi, Yaping Wang, Junyi Lee, Lee Aucott, Jun Jiang
Summary: Understanding the interaction between micro-voids and grain boundaries is crucial for improving the mechanical properties of safety-critical parts. By achieving grain boundary migration across voids, we demonstrate the beneficial effects on mechanical properties. The study used in-situ EBSD/FSE and crystal plasticity finite element modeling to investigate the micromechanisms and quantitative analysis of grain boundary migration on local deformation.
Article
Chemistry, Multidisciplinary
Qiang Zhang, Minhui Yuan, Kaikai Pang, Yuyou Zhang, Ruoyu Wang, Xiaojian Tan, Gang Wu, Haoyang Hu, Jiehua Wu, Peng Sun, Guo-Qiang Liu, Jun Jiang
Summary: In this study, an effective method was reported to improve the low thermoelectric efficiency of p-type (Bi,Sb)2Te3 by incorporating Ag8GeTe6 and Se. The addition of Ag and Ge atoms optimized the carrier concentration and effective mass, while the Sb-rich nanoprecipitates formed coherent interfaces with little loss of carrier mobility. The subsequent Se doping introduced multiple phonon scattering sources and significantly suppressed the lattice thermal conductivity. The optimized sample achieved a high peak ZT of 1.53 at 350 K and a remarkable average ZT of 1.31 (300-500 K), with an extraordinary conversion efficiency of 6.3% at Delta T = 245 K for the constructed TE module.
ADVANCED MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Baptiste Gault, Heena Khanchandani, Thoudden Sukumar Prithiv, Stoichko Antonov, T. Ben Britton
Summary: Measuring local chemistry of specific crystallographic features by atom probe tomography (APT) is aided by transmission Kikuchi diffraction (TKD), but the potential structural damage caused by TKD is often ignored. Two case studies demonstrate damage in APT specimens from TKD mapping. The damage includes planar segregation of solutes and the formation of voids containing high concentrations of a specific element.
MICROSCOPY AND MICROANALYSIS
(2023)
Article
Materials Science, Multidisciplinary
Chen Jin, Ruiyang Li, Yongfu Liu, Liangliang Zhang, Jiahua Zhang, Peng Sun, Zhaohua Luo, Jun Jiang
Summary: An easy strategy is reported to improve the luminescent properties of GGG:Cr3+ phosphor by optimizing the synthesized technology. The EQE is enhanced to 43.6% and the fabricated pc-LEDs achieve a high WPE of 34.3%. These results demonstrate significant advancements in NIR phosphor materials and NIR pc-LED devices.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Engineering, Chemical
Di Xiao, Peng Sun, Jianlin Wu, Yin Zhang, Jiehua Wu, Guoqiang Liu, Haoyang Hu, Jun Hu, Xiaojian Tan, Shi He, Jun Jiang
Summary: Thermoelectric technology is an effective strategy to convert low-grade waste heat to electrical energy directly. However, there is limited research on thermoelectric generators (TEGs) for use in industrial pipelines. In this study, an arch bridge-shaped heat collector was proposed for the pipe to recover wasted thermal energy. The effects of key factors on generating performance were studied, and the experimental results showed the feasibility of using TEGs to recover waste heat from pipes.
Article
Materials Science, Multidisciplinary
Wenjie Huang, Xiaojian Tan, Jianfeng Cai, Shuai Zhuang, Chuandong Zhou, Jiehua Wu, Guoqiang Liu, Bo Liang, Jun Jiang
Summary: In this study, the thermoelectric performance of zone-melted n-type Bi2Te2.7Se0.3 material is significantly improved by co-doping with BiI3 and SnSb2Te4. BiI3, a non-toxic and non-hygroscopic electron dopant, effectively enhances the power factor and partially suppresses the bipolar effect of n-type Bi2Te2.7Se0.3. SnSb2Te4 doping introduces new scattering centers, resulting in a relatively low lattice thermal conductivity of 0.72 W m(-1) K-1 at 300 K. As a result, a maximum ZT value of 1.30 at 325 K and an average ZT value of 1.00 in the temperature range of 300-500 K are achieved in the Bi2Te2.Se-7(0.3) + 0.15 wt% BiI3 + 0.15 wt% SnSb2Te4 sample. This work provides a feasible approach to effectively improve the thermoelectric performance of n-type zone-melted Bi2Te3.
MATERIALS TODAY PHYSICS
(2023)
Article
Multidisciplinary Sciences
Qian Wei, Chao Qu, Jun Jiang, Guanghong Zhang
Summary: The purpose of this study was to determine the safe dose range of EDTA for calcific band keratopathy surgery and its toxic effects on rabbit eyes. The rabbits were administered different doses of EDTA solutions and pathological examination was performed for cornea. The study found that low concentrations of EDTA had no obvious toxic effect on the corneal endothelium compared with higher concentrations, but further clinical trials and observation of therapeutic effects with different concentrations are necessary.
Article
Materials Science, Ceramics
Yukun Li, Yongfu Liu, Zhaohua Luo, Zehua Liu, Svenja Hanson, Chengheng Pang, Hui Lin, Haiming Qin, Jun Jiang
Summary: Ce/Mn/Cr: Y3Al5O12 transparent ceramics with a pure garnet structure and a high color rendering index were prepared via solid-state reaction. Mn2+ and Cr3+ enhance the emission between 500 and 700 nm and expand the spectrum of conventional Ce: YAG phosphors. Ce3+ functions as both activators and sensitizers, and the energy transfer from Ce3+ to Mn2+/Cr3+ is achieved through non-radiative and radiative processes. The optimized doping concentration results in a high color rendering index (CRI) of 75.3 under a 450 nm laser diode excitation. The chromaticity coordinates can be tuned by varying the doping concentration. However, increasing Mn2+/Cr3+ doping concentration leads to a decrease in Ce3+ lifetime, quantum efficiency, and luminous efficiency. This work provides a scheme for achieving high color rendering performance in phosphor-converted transparent ceramics for white LEDs/LDs.
CERAMICS INTERNATIONAL
(2023)
Article
Materials Science, Ceramics
Xianhui Wu, Zhaohua Luo, Yijun Zhuang, Zehua Liu, Peng Sun, Yongfu Liu, Liaolin Zhang, Haiming Qin, Jun Jiang
Summary: Researchers prepared a series of GASGG:Cr3+ ceramic phosphors by doping Sc3+ to increase the emission bandwidth while maintaining high efficiency and thermal stability. A NIR pc-LED prototype device was fabricated by combining GASGG:Cr3+ ceramic phosphor with a blue LED chip, achieving an output power of 646 mW and a photoelectric conversion efficiency of 19.2%. Finally, the application effect of this prototype device in night vision and venography was demonstrated.
CERAMICS INTERNATIONAL
(2023)
Article
Engineering, Environmental
Gang Wu, Xiaojian Tan, Minhui Yuan, Qiang Zhang, Jacques G. Noudem, Zehua Liu, Chen Cui, Jiehua Wu, Haoyang Hu, Peng Sun, Guo-Qiang Liu, Jun Jiang
Summary: A n-type Bi2Te2.7Se0.3 + x wt% PbI2 polycrystalline material with high texture degree and various microstructures was prepared by the temperature gradient method. The dilute PbI2 doping not only adjusted the carrier concentration to an optimal level but also reduced the lattice thermal conductivity, resulting in a peak ZT of 1.26 and improved Vickers hardness of 0.48 GPa.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Engineering, Manufacturing
Ruiqiang Zhang, Jun Jiang, Jianguo Lin, Victoria A. Yardley
Summary: Thermo-mechanical uniaxial tensile testing is commonly used to characterize material properties under advanced industrial forming processes. This study investigates the effect of nonuniform temperature distributions on the variability of thermo-mechanical properties and microstructures of tested specimens.
JOURNAL OF MANUFACTURING PROCESSES
(2023)
Article
Metallurgy & Metallurgical Engineering
Kai Zhang, Zhutao Shao, Joseph Robson, Yan Huang, Jinghua Zheng, Jun Jiang
Summary: A new cryogenic-hot forming process concept is proposed and proven to improve the ductility and fracture strength of magnesium alloys. This is achieved through effective grain refinement and texture weakening, making it a potential innovative method for producing high-performance magnesium components.
JOURNAL OF MAGNESIUM AND ALLOYS
(2023)
Article
Materials Science, Multidisciplinary
Ruoyu Wang, Jianfeng Cai, Qiang Zhang, Xiaojian Tan, Jiehua Wu, Guoqiang Liu, Jun Jiang
Summary: Diamond like ternary chalcopyrites MBX2 (M = Cu, Ag; B = Ga, In, Tl; X = S, Se, Te) have attracted significant research attention in the field of thermoelectrics due to their competitive performance and diverse transport properties. The ultralow thermal conductivity of AgBX2 compared to CuBX2 is explained by the mismatched atomic bonds between Ag-X and B -X pairs, resulting from the weaker bonding strength of Ag-X due to the expanded 4d orbital of Ag. This study provides important insights into the ultralow thermal conductivity of Ag-based ternary chalcopyrites and suggests a general strategy to suppress thermal conductivity in ternary compounds.
Article
Materials Science, Multidisciplinary
Xin Zhang, Jianfeng Cai, Xiaojian Tan, Shuai Zhuang, Wenjie Huang, Zongwei Zhang, Haoyang Hu, Jiehua Wu, Guo-Qiang Liu, Jun Jiang
Summary: In this study, n-type SnSe0.95-based materials were prepared using PbCl2 as an electron dopant through ball milling and hot-pressing processes. It was found that PbCl2 effectively increased the carrier concentration and improved the thermoelectric performance. Electronic transport measurements showed an enhanced power factor in the 6% PbCl2 doped sample. TEM images revealed the presence of dislocations and grain boundaries in the polycrystalline, which enhanced phonon scattering and suppressed lattice thermal conductivity. As a result, a maximum ZT value of 1.13 at 823 K was obtained in the n-type SnSe0.95 + 6% PbCl2 polycrystalline sample parallel to the hot-pressing direction.
MATERIALS ADVANCES
(2023)
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)