Article
Crystallography
Jaroslav Polak
Summary: The cyclic plastic deformation of polycrystals leads to the concentration of cyclic plastic strain in persistent slip bands (PSBs) which have different dislocation structure compared to the matrix. The formation of point defects, their migration, and the mechanics of dislocation motion in PSBs are quantitatively described. The localized cyclic plastic straining in PSBs results in the production of persistent slip markings (PSMs) on the surface. These PSMs contribute to surface relief and grain boundary relief, as well as the initiation of intragranular fatigue cracks and grain boundary cracks.
Article
Engineering, Mechanical
Yajun Dai, Shijian Wang, Qiyuan He, Chang Liu, Xianyu Wang, Xue Li, Lang Li, Yongjie Liu, Chao He, Qingyuan Wang
Summary: The multi-scaled microstructure of martensitic steel significantly affects the initiation and early propagation of cracks. Micro cracks first occur in the slip bands inside the single crystal laths, then coalesce through the lath boundaries, and finally propagate slowly in neighboring grains.
INTERNATIONAL JOURNAL OF FATIGUE
(2023)
Article
Engineering, Mechanical
Mohammad S. Dodaran, Muztahid Muhammad, Nima Shamsaei, Shuai Shao
Summary: This study investigates the fatigue crack initiation mechanism in additively manufactured Inconel 718 alloy. The results show that unlike other alloys, fatigue cracks in IN-718 often initiate from persistent slip bands. A slip strength evolution law based on free slip distance is proposed to model the strain distribution in IN-718. The locations and lives for crack initiation can be calculated using a strain contrast criterion. The study also finds that both slip distance and shear stress affect strain localization and crack initiation behavior.
INTERNATIONAL JOURNAL OF FATIGUE
(2022)
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
Nanoscience & Nanotechnology
T. Babinsky, I Kubena, I Sulak, T. Kruml, J. Tobias, J. Polak
Summary: The study focused on the surface relief evolution and fatigue crack initiation of Rene'41 superalloy, revealing the crucial role of persistent slip markings in fatigue crack initiation at room temperature.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Nanoscience & Nanotechnology
Abbas Jamali, Anxin Ma, Javier LLorca
Summary: The analysis of a textured AZ31B-O Mg alloy subjected to fully-reversed, strain-controlled cyclic deformation revealed that pyramidal slip and twinning coexisted in only 9.1% of the grains after 50 cycles, while cracking was widespread, with grain boundary cracks found in approximately 15% of small grains and transgranular cracks in large grains after 50 cycles.
SCRIPTA MATERIALIA
(2022)
Article
Materials Science, Multidisciplinary
Abbas Jamali, Anxin Ma, Javier LLorca
Summary: The deformation and fatigue crack nucleation mechanisms in a textured AZ31B-O Mg alloy were investigated using slip trace analysis and secondary electron microscopy. The results showed that the localization of deformation in different grains led to the nucleation of fatigue cracks along specific slip bands or twin boundaries. Grain boundary cracks were present in all cases but were not critical for fatigue failure. This study provides valuable information for evaluating the influence of microstructural features on the fatigue life of Mg alloys and for simulating their fatigue behavior using fatigue indicator parameters.
Article
Engineering, Mechanical
Danilo Rangel, Diego Erena, Jesus Vazquez, J. A. Araujo
Summary: This paper proposes a method to calculate fretting fatigue crack initiation and total life using iterative models calibrated with fatigue stress-strain-life curves, taking into account multiaxial non-proportional stress fields in fretting problems and stress gradient effects. The crack initiation path is obtained through the SWT parameter, and the analyzed results are validated by comparison with tests for an Aluminium 7075-T651 alloy in a cylindrical-flat configuration.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2022)
Article
Nanoscience & Nanotechnology
Alice Cervellon, Chris J. Torbet, Tresa M. Pollock
Summary: The anisotropic fatigue properties of three Ni-based SX superalloys were investigated in the very high cycle fatigue regime. The [111] orientation showed higher fatigue lives at high stresses but lower fatigue lives at very low stresses. The resolved shear stress on the octahedral slip systems and the pseudo-cube slip in the matrix were identified as the main reasons for the anisotropy effect.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Materials Science, Multidisciplinary
Florian Schaefer, Sebastian Geyer, Christian Motz
Summary: The effect of hydrogen on the fatigue behavior of materials has been extensively studied, but its understanding is limited due to the complex interaction between hydrogen and deformation processes. Hydrogen damage in metals is becoming a major challenge in decarbonization, especially in b.c.c. metals like structural steels. This study investigates the formation and evolution of intrusions and extrusions before fatigue crack initiation in a-iron steels using in situ electrochemical hydrogen charging, which allows subsequent surface characterization without artifacts. The results show that hydrogen enhances slip localization and reduces orientation gradients in the dislocation structure, promoting slip reversibility in b.c.c. materials.
ADVANCED ENGINEERING MATERIALS
(2023)
Article
Engineering, Mechanical
Diego Erena, Vicente Martin, Jesus Vazquez, Carlos Navarro
Summary: This study conducts a detailed analysis of cracks in fretting fatigue tests with cylindrical contact, where a small oscillatory rolling of the contact pad is present. The contact area is found to be larger than the theoretical value predicted by Hertz's theory, indicating the occurrence of rolling of the contact pad due to contact geometry and test setup stiffness. A 2D numerical model is developed to reproduce this phenomenon, and the results are compared with actual crack profile measurements.
INTERNATIONAL JOURNAL OF FATIGUE
(2022)
Article
Engineering, Mechanical
Guoying Sui, Zhenqiang Wang, Jiarui Li, Chengzhi Zhao, Fengchun Jiang, Hongliang Li
Summary: In this study, the fatigue characteristics and cracking behaviors of 42CrMo steel with two different microstructures (fine/coarse-grain tempered sorbite/bainite) were investigated. It was found that fine-grain microstructure exhibits higher fatigue strength, while the coarse-grain microstructure has a higher fatigue crack growth threshold. The presence of multiple fatigue sources and higher-degree ratchetting-fatigue damage in the coarse-grain microstructure accelerates fatigue crack initiation. Roughness-induced crack closure in the coarse-grain microstructure leads to a delay in fatigue crack growth and an increase in the fatigue crack growth threshold.
INTERNATIONAL JOURNAL OF FATIGUE
(2023)
Article
Engineering, Mechanical
Tao Gao, Hongqian Xue, Zhidan Sun, Delphine Retraint, Yanli He
Summary: The fatigue behavior and damage mechanisms of a Ti-8Al-1Mo-1V alloy were investigated in the very high cycle fatigue (VHCF) regime. It was found that the crack initiation area is characterized by nano-marking facets and flat facets induced by slip activity. The large scatter in fatigue life can be attributed to slip inhomogeneity.
INTERNATIONAL JOURNAL OF FATIGUE
(2021)
Article
Engineering, Biomedical
H. M. A. Kolken, A. Fontecha Garcia, A. Du Plessis, A. Meynen, C. Rans, L. Scheys, M. J. Mirzaali, A. A. Zadpoor
Summary: This study investigates the fatigue performance and crack formation mechanism of additively manufactured auxetic meta-biomaterials. Through full-field strain measurement and 3D imaging, the damage evolution during cyclic loading is revealed. Targeting the structural weak spots during the design and printing process is crucial for enhancing the performance of auxetic meta-biomaterials.
ACTA BIOMATERIALIA
(2022)
Article
Nanoscience & Nanotechnology
Fei Li, Yali Zhang, Ziyan Wu, Xi Ren, Xiaowei Yue, Haiqing Pei, Zhufeng Yue
Summary: This paper comprehensively summarized the fatigue crack initiation and propagation behavior of film cooling holes (FCHs) under different drilling processes for nickel-based superalloys. Experimental and simulation studies were conducted to investigate the mechanisms of crack formation and propagation, leading to the proposal of a unified model for fatigue crack growth rate.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Nanoscience & Nanotechnology
Veronika Mazanova, Milan Heczko, Viktor Skorik, Alice Chlupova, Jaroslav Polak, Tomas Kruml
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2019)
Article
Engineering, Mechanical
Jaroslav Polak, Roman Petras
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2020)
Article
Engineering, Mechanical
Roman Petras, Ivo Sulak, Jaroslav Polak
Summary: The superaustenitic steel Sanicro 25 was subjected to out-of-phase thermomechanical fatigue cycles with dwell at peak temperature within the range of 250°C to 700°C. The effects of dwell on cyclic response, internal structure, and damage mechanism were studied, evaluating cyclic hardening/softening curves, stress-strain curves, and fatigue life curves. Various advanced microscopy techniques were used to analyze internal structure, nanoparticle obstacles for dislocation motion, and mechanisms responsible for fatigue crack nucleation and propagation. Discussions were made on the effects of dwells in in-phase and out-of-phase cycling on fatigue behavior, internal structure modification, and damage mechanisms.
FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES
(2021)
Article
Materials Science, Multidisciplinary
Lukas Travnicek, Ivo Kubena, Veronika Mazanova, Tomas Vojtek, Jaroslav Polak, Pavel Hutar, Miroslav Smid
Summary: Two approaches were tested to describe short fatigue crack growth under large-scale yielding conditions: the plastic component of the J-integral and the Polak model of crack propagation. It was found that the employed continuum mechanics models were able to give satisfactory results for stainless steels Sanicro 25 and 304L, despite their different properties. The residual fatigue lives estimated by these models were in good agreement with the experimental data, suggesting the potential of the plastic part of J-integral as a tool to model fatigue crack propagation.
Article
Materials Science, Multidisciplinary
S. Fintova, I Kubena, A. Chlupova, M. Jambor, I Sulak, Z. Chlup, J. Polak
Summary: The study found that as the loading frequency increases, the fatigue cycles to fracture of pure polycrystalline copper also increase. The surface relief and internal structure were found to be related to cyclic straining, with microcavities forming the initiation points of fatigue cracks within slip bands.
Article
Nanoscience & Nanotechnology
T. Babinsky, I Kubena, I Sulak, T. Kruml, J. Tobias, J. Polak
Summary: The study focused on the surface relief evolution and fatigue crack initiation of Rene'41 superalloy, revealing the crucial role of persistent slip markings in fatigue crack initiation at room temperature.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Nanoscience & Nanotechnology
Milan Heczko, Veronika Mazanova, Connor E. Slone, Mulaine Shih, Easo P. George, Maryam Ghazisaeidi, Jaroslav Polak, Michael J. Mills
Summary: The CrCoNi alloy exhibited cyclic hardening and softening behavior during low cycle fatigue testing, leading to failure. Deformation twins generated during the cycling process showed well-developed persistent slip markings.
SCRIPTA MATERIALIA
(2021)
Article
Engineering, Mechanical
Veronika Mazanova, Milan Heczko, Jaroslav Polak
Summary: Studies have shown that the mechanism of fatigue crack initiation in high-angle grain boundaries is controversial. In this research, experiments were conducted on super-austenitic stainless steel Sanicro 25 to study the surface features that developed during cyclic loading with high strain amplitudes. The results revealed the presence of slip markings on the surface of grains, as well as extrusions and intrusions along the surface and normal to the grain boundaries. These processes ultimately weakened the grain boundary and led to the production of grain boundary cracks. These experimental findings challenge the theories suggesting a brittle-like origin of grain boundary cracks.
INTERNATIONAL JOURNAL OF FATIGUE
(2022)
Article
Nanoscience & Nanotechnology
Alice Chlupova, Ivo Sulak, Tomas Babinsky, Jaroslav Polak
Summary: In this study, the fatigue behavior and initiation mechanism of intergranular cracks in polycrystalline copper specimens were investigated. Scanning electron microscopy was used to observe the crack formation on the electrolytically polished specimen surfaces, and a correlation was found between the occurrence of extrusions and intrusions on the grain boundaries and the formation of corrugated surface near the intergranular cracks. These findings contribute to a better understanding of the fatigue behavior and initiation mechanism of intergranular cracks in polycrystalline copper.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Crystallography
Jaroslav Polak
Summary: The cyclic plastic deformation of polycrystals leads to the concentration of cyclic plastic strain in persistent slip bands (PSBs) which have different dislocation structure compared to the matrix. The formation of point defects, their migration, and the mechanics of dislocation motion in PSBs are quantitatively described. The localized cyclic plastic straining in PSBs results in the production of persistent slip markings (PSMs) on the surface. These PSMs contribute to surface relief and grain boundary relief, as well as the initiation of intragranular fatigue cracks and grain boundary cracks.
Article
Engineering, Mechanical
Ladislav Poczklan, Jaroslav Polak, Tomas Kruml
Summary: The endurance of 316L steel against multiaxial fatigue is examined. The fatigue life curve for torsional mode extends to longer fatigue lives, while tension/compression mode causes the earliest fracture. The fatigue life curves for both multiaxial modes are similar to the axial mode. Fourteen critical plane models for fatigue life predictions were applied and compared. The modified Smith-Watson-Topper models prove to be the most accurate. The criteria proposed by Fatemi and Socie, Li et al., Zhu et al., and Wang and Brown also produce satisfactory results. The Smith-Watson-Topper model leads to the most precise predictions of fatigue crack orientation.
INTERNATIONAL JOURNAL OF FATIGUE
(2023)
Article
Materials Science, Multidisciplinary
Sarka Mikmekova, Jiri Man, Ondrej Ambroz, Patrik Jozefovic, Jan Cermak, Antti Jarvenpaa, Matias Jaskari, Jiri Materna, Tomas Kruml
Summary: This paper demonstrates a new technique for accurately visualizing and mapping deformation-induced α'-martensite in a metastable austenitic stainless steel. The technique utilizes energy and angular separation of signal electrons in a scanning electron microscope (SEM) to acquire micrographs with high sensitivity to structural defects. A deep learning method using the U-Net architecture extended by the ResNet encoder is proposed for precise α'-martensite mapping within a large area.
Article
Materials Science, Multidisciplinary
J. Polak
Proceedings Paper
Materials Science, Multidisciplinary
Jaroslav Polak
TMS 2019 148TH ANNUAL MEETING & EXHIBITION SUPPLEMENTAL PROCEEDINGS
(2019)
Proceedings Paper
Engineering, Mechanical
Jaroslav Polak, Veronika Mazanova, Roman Petras, Milan Heczko
12TH INTERNATIONAL FATIGUE CONGRESS (FATIGUE 2018)
(2018)
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)
