Article
Nanoscience & Nanotechnology
Peng Yin, Wei Zhang, Shen Guo, Jianbin Wen, Guodong Zhang, Fei Xue, Yanfen Zhao, Changyu Zhou
Summary: In this study, TMF tests were conducted to investigate the cyclic deformation and damage mechanisms of P92 steel under different strain rates. The results showed that increasing strain rate significantly improved fatigue life, with OP-TMF leading to more severe damage compared to IP-TMF. The presence of dynamic strain ageing (DSA) was found to be dependent on strain rate, fatigue cycle, and phase angle, affecting fatigue life in combination with fatigue cracks, creep voids, and oxidation.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Mechanics
Tianyu Zhang, Xiaowei Wang, Chunan Zhang, Yong Jiang, Jianfeng Wen, Xiancheng Zhang, Jianming Gong
Summary: Hybrid stress-strain controlled creep-fatigue interaction (HCFI) tests were conducted on 9% Cr steel with strain amplitudes ranging from ±0.25% to ±0.6%. Increase in strain amplitude leads to increased possibility of cracking and reduced crack deflections, along with differences in LABs and grain size. However, for HCFI tests with high creep damage, strain amplitude plays a minor role as significant creep strain during stress holding is converted into fatigue strain even at low strain amplitudes. Moreover, a dwell indicator (DI) benchmarked against macroscopic LCF responses is proposed to evaluate strain amplitude-induced microscopic HCFI damage. Significant changes in internal degradation and fracture behaviors occur when DI is approximately equal to (or greater than) 0.9, while HCFI damage shows low sensitivity to strain amplitude when DI is close to (or lower than) 0.5.
ENGINEERING FRACTURE MECHANICS
(2023)
Article
Engineering, Mechanical
Zhenzhen Xu, Jianxun Zhang, Bo Zhu
Summary: The effect of mechanical heterogeneity on the low cycle fatigue properties of a 9-12% Cr martensitic steel welded joint with Ni-based weld metal was investigated. It was found that the smooth specimens of the welded joint fracture at the weld metal due to strain concentration, but the strain-life curves were similar after considering the mechanical heterogeneity. The low cycle fatigue properties of the inter-critically heat-affected zone were determined using hourglass specimens and compared with the base metal and weld metal properties.
ENGINEERING FAILURE ANALYSIS
(2022)
Article
Engineering, Mechanical
Jianfeng Mao, Jian Zhu, Xiangyang Li, Dasheng Wang, Fengping Zhong, Jichang Chen
Summary: The creep-fatigue behaviors of P92 steel at high temperatures are mainly affected by temperature, leading to a significant reduction in fatigue life with increasing temperature. Additionally, the dislocation density decreases and the martensite laths become coarser as creep fatigue increases, while an increase in strain amplitude results in more secondary cracks and fatigue striation.
JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY
(2022)
Article
Engineering, Mechanical
Jingwei Zhao, Bingbing Li, Gang Chen, Takamoto Itoh, Xu Chen
Summary: Fatigue tests on 316LN stainless steel showed that the introduction of tensile strain hold had a more deleterious effect on TMF performance, and an inelastic relaxation strain rate is more appropriate for characterizing creep damage.
INTERNATIONAL JOURNAL OF FATIGUE
(2022)
Article
Engineering, Mechanical
Qingtong Wang, Bingbing Li, Jingwei Zhao, Takamoto Itoh, Xu Chen
Summary: Isothermal and thermomechanical fatigue tests were performed with different tension dwell times, and the cyclic stress response and stress relaxation behavior were analyzed using TEM and EBSD. The results showed that fatigue was the dominant mechanism for crack initiation and propagation in all creep-IF tests, leading to specimen fracture. However, in creep-TMF tests, when the dwell time increased to 1800 s, the dominant damage mechanism shifted to creep-fatigue interaction, resulting in intergranular fracture mode and a significantly shorter life. Additionally, a life prediction model based on tension strain energy was proposed.
INTERNATIONAL JOURNAL OF FATIGUE
(2023)
Article
Engineering, Mechanical
Pei-Shan Ding, Xiao-Tao Zheng
Summary: The creep-ratcheting behavior of advanced 9-12 % Cr ferritic steel at 600 degrees C under different peak holding times was investigated, and a corresponding creep-ratcheting constitutive model was developed. Results showed that the anelastic strain remains relatively constant for different holding times, but decreases rapidly during the last several cycles. Moreover, the study observed the behavior of primary creep regeneration during repeated loading and unloading, which remains almost the same with increasing number of cycles.
INTERNATIONAL JOURNAL OF FATIGUE
(2023)
Article
Mechanics
Xiaowei Wang, Tianyu Zhang, Wei Zhang, Magd Abdel Wahab, Jianming Gong
Summary: This study presents an improved unified viscoplastic model to simulate the various behavior of P92 steel under low cycle fatigue (LCF) and creep fatigue interaction (CFI) loadings. By adjusting the parameters and rules in the model, good agreement is achieved with experimental results.
EUROPEAN JOURNAL OF MECHANICS A-SOLIDS
(2021)
Article
Nanoscience & Nanotechnology
Christos Triantafyllou, Darren C. Pagan, Andrew McBride
Summary: This study used high-energy X-ray diffraction to investigate the evolution of elastic lattice strains in rolled Ti-6Al-4V specimens during cyclic loading. The effects of texture on the micromechanical response were explored by monitoring lattice planes in different orientations. The results showed that under cyclic loading conditions with a dwell period, the elastic strains in prismatic and basal lattice planes increased significantly when the specimen was loaded at 45 degrees from the rolling direction. In the absence of a dwell period, both RD and TD specimen orientations exhibited subtle cyclic hardening in all lattice plane families.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Engineering, Mechanical
Tianyu Zhang, Xiaowei Wang, Yunnan Ji, Jianqun Tang, Yong Jiang, Xiancheng Zhang, Jianming Gong
Summary: The results of HCFI tests on 9%Cr steel at 625 degrees C reveal that conservative dwell conditions lead to complex cyclic responses and low creep strain, ultimately resulting in strong creep-fatigue interaction damage.
INTERNATIONAL JOURNAL OF FATIGUE
(2021)
Article
Engineering, Mechanical
Zhi Liu, Jian-Guo Gong, Peng Zhao, Xiao-Cheng Zhang, Fu-Zhen Xuan
Summary: This study investigated the creep fatigue behavior of 9-12%Cr steel under stress-controlled cycling at elevated temperature, considering most previous tests were conducted under strain-controlled mode. The effects of holding time and loading rate on deformation and damage behavior were particularly focused. The results showed that a significant creep ratcheting was generally observed in the creep-fatigue tests with the stress ratio of -1. Ratcheting strain and creep damage progressed faster with longer holding time or lower loading rate, leading to a decrease in the number of cycles to creep-fatigue failure.
INTERNATIONAL JOURNAL OF FATIGUE
(2022)
Article
Materials Science, Multidisciplinary
Peng Yin, Wei Zhang, Yi Zhang, Qiaofa Yang, Fei Liang, Le Chang, Changyu Zhou
Summary: The thermomechanical fatigue behavior of 316L was investigated by analyzing internal stress and microstructural characteristics at different cyclic stages. The results showed that cyclic stress response exhibited initial hardening followed by cyclic softening at high strain amplitudes, while continuous cyclic hardening was observed as the strain amplitude decreased. Out-of-phase TMF always resulted in cyclic softening regardless of strain amplitude. The contributions of back stress and friction stress to initial and subsequent cyclic hardening were highlighted. The hardening of back stress and friction stress was attributed to dislocation proliferation at grain boundaries and increased dislocation interactions within grains, respectively. The cyclic softening of friction stress was attributed to the annihilation of dislocations due to cross-slip. The hysteresis curves revealed that the intensity of dynamic strain aging depended on strain amplitude, loading history, and phase angle, which were related to cross-slip occurrence, solute atom diffusion rate, point defect density, and vacancy mobility. The effect of loading conditions on fracture behavior, including crack sources, secondary cracks, creep cavities, and oxidation damage, was demonstrated.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Physics, Applied
Yong-Zheng Li, Shi-Xin Zhang, Ke Wang
Summary: This paper investigates the dwell-fatigue behavior of a new titanium alloy for pressure hull. It is found that increasing dwell time leads to a decrease in fatigue life and an increase in plastic strain accumulation.
INTERNATIONAL JOURNAL OF MODERN PHYSICS B
(2022)
Article
Engineering, Mechanical
Dongjin Kim, Seungjun Noh, Semin Park, Min-Su Kim
Summary: Power modules undergoing cyclic power operation experience thermomechanical fatigue. The study found that the epoxy molding compounds and creep behaviors of solder joints contributed to the strain hardening of the Cu clip wiring, leading to power module failure during power operation. The grain size in the Cu clips reduced by 90% compared to its initial state, and an increase in hardness was observed. These findings suggest that EMC constraints and the creep behaviors of solder joints are crucial factors for strain hardening of bare Cu clips in EV power modules.
INTERNATIONAL JOURNAL OF FATIGUE
(2023)
Article
Engineering, Mechanical
Lv-Yi Cheng, Run-Zi Wang, Ji Wang, Shun-Peng Zhu, Peng-Cheng Zhao, Hideo Miura, Xian-Cheng Zhang, Shan-Tung Tu
Summary: This study investigated the strain-controlled creep-fatigue behavior of a nickel-based superalloy at 650 degrees C, using a non-unified constitutive framework to describe the macroscopic cyclic deformation process and quantitatively evaluating creep-fatigue damage using the cycle-by-cycle strain energy density exhaustion approach. The proposed life model effectively revealed the effects of strain ratio and dwell time on creep-fatigue life endurances, with all data points predicted within +/- 1.5 error band. Improved life prediction capacities were observed for long dwell times based on the three-regime creep mechanism.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2021)
Article
Materials Science, Multidisciplinary
Luis Alexander Avila Calderon, Benjamin Graf, Birgit Rehmer, Torsten Petrat, Birgit Skrotzki, Michael Rethmeier
Summary: Laser powder-based directed energy deposition (DED-L) is a widely used technique in additive manufacturing (AM). This study presents an approach for fabricating Ti-6Al-4V using DED-L that addresses specific challenges and is applicable to AM. The assessment of obtained properties and their relationship with process conditions and microstructure is discussed, demonstrating high-quality manufacturing process and excellent mechanical properties at room temperature and 400 degrees C.
ADVANCED ENGINEERING MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Bernd Bayerlein, Thomas Hanke, Thilo Muth, Jens Riedel, Markus Schilling, Christoph Schweizer, Birgit Skrotzki, Alexandru Todor, Benjami Moreno Torres, Jorg F. Unger, Christoph Voelker, Jurgen Olbricht
Summary: The worldwide data volume is constantly increasing, and the heterogeneous research data in materials science and engineering face similar challenges. Ways and solutions are increasingly being sought to smartly link material data with contextual information for discovery, retrieval, and reuse in research and industry.
ADVANCED ENGINEERING MATERIALS
(2022)
Review
Metallurgy & Metallurgical Engineering
M. Mosquera Feijoo, G. Oder, R. Saliwan Neumann, M. Buchheim, A. Kranzmann, J. Olbricht
Summary: This study investigated the steam side oxidation of ferritic-martensitic VM12-SHC steel and found that pre-oxidation time, specimen geometry, and surface finish have significant influences on the oxidation process. Curvature also plays a role in controlling the corrosion kinetics.
OXIDATION OF METALS
(2022)
Article
Mechanics
Jiangchao Zhu, Mauro Madia, Michael Schurig, Bernard Fedelich, Hartmut Schlums, Uwe Zerbst
Summary: Aero-engine turbine disks are critical components that experience high thermal and mechanical stresses. Current part qualification and certification procedures involve spin-tests on production-similar disks. These tests provide reliable information on critical conditions but are costly for engine manufacturers. This study presents two alternative burst speed assessment methods based on the Failure Assessment Diagram (FAD) and a global stability criterion. The methods are compared for the failure modes hoop-burst and rim-peeling using semi-circular surface cracks modeled on the turbine disk's critical regions, demonstrating good agreement in predicting critical rotational speeds.
ENGINEERING FRACTURE MECHANICS
(2023)
Article
Multidisciplinary Sciences
Christian Rockenhaeuser, Philipp von Hartrott, Birgit Skrotzki
Summary: The article presents data on the Brinell hardness of forged precipitation-hardened aluminum alloy EN AW-2618A in the initial T61 condition and after isothermal aging. The hardness decreases with increasing aging time, particularly at higher aging temperatures. Additionally, aging under creep load accelerates the hardness decrease.
Article
Materials Science, Multidisciplinary
Alexander Ulbricht, Luis Alexander Avila Calderon, Konstantin Sommer, Gunther Mohr, Alexander Evans, Birgit Skrotzki, Giovanni Bruno
Summary: The damage mechanisms of metallic components produced by laser powder bed fusion differ significantly from those in conventionally manufactured variants of the same alloy, due to the unique microstructures of additively manufactured materials. X-ray computed tomography is used to analyze the void distribution and the evolution of creep damage in stainless steel 316L specimens. The results show that damage accumulation at grain boundaries resulting from intergranular cracking is observed, and is not connected to the initial void distribution.
ADVANCED ENGINEERING MATERIALS
(2023)
Article
Mechanics
St. Gesell, R. Ganesh, M. Kuna, B. Fedelich, B. Kiefer
Summary: Crack propagation under low cycle fatigue and thermomechanical fatigue is characterized by high plastic and creep strains that require different approaches for quantifying crack growth. The cyclic crack tip opening displacement (ACTOD) is investigated as a promising loading parameter. A viscoplastic temperature dependent material model is used along with special crack tip elements for accurate calculation. An efficient FE-technique is developed for simulating fatigue crack growth by successive remeshing and recommendations are made for important numerical control parameters.
ENGINEERING FRACTURE MECHANICS
(2023)
Article
Engineering, Mechanical
Nadja Sonntag, Maria Juergens, Birgit Skrotzki, Juergen Olbricht
Summary: In this study, complex relaxation- and creep-fatigue tests were performed on P92 steel at 620 degrees C, with the results showing different effects on subsequent dwells, load shifts, and macroscopic softening behavior. Fracture surfaces and metallographic sections revealed intergranular crack growth under stress-controlled dwells, while complex strain-controlled tests enhanced oxidation and transgranular crack propagation. These findings indicate the limited transferability of relaxation-fatigue to creep-fatigue conditions.
INTERNATIONAL JOURNAL OF FATIGUE
(2023)
Article
Nanoscience & Nanotechnology
Ying Han, Julius Kruse, Julian M. Rosalie, Jan Radners, Philipp von Hartrott, Birgit Skrotzki
Summary: The fatigue properties of forged aluminum alloy were studied under different stress ratios and aging states. The results showed that overaging significantly reduced the fatigue life of the alloy, which was mainly attributed to the decrease in yield strength and the increase in precipitate radius.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Multidisciplinary Sciences
Birgit Rehmer, Faruk Bayram, Luis Alexander Avila Calderon, Gunther Mohr, Birgit Skrotzki
Summary: This article presents the temperature-dependent elastic properties of three alloys (Ti-6Al-4V, Inconel IN718, and AISI 316 L) measured using the dynamic resonance method. The datasets include information on processing routes, heat treatments, grain size, specimen dimensions, and weight, as well as Young's and shear modulus along with their measurement uncertainty. The datasets were generated in an accredited testing lab, audited as BAM reference data, and are available in the open data repository Zenodo. Possible applications include verifying test setups, designing VHCF specimens, and using as input data for simulations.
Article
Multidisciplinary Sciences
Nadja Sonntag, Maria Joergens, Patrick Uhlemann, Birgit Skrotzki, Joergen Olbricht
Summary: This article presents experimental mechanical data from complex service-like creep-fatigue experiments on P92 steel. The datasets provide valuable information for approximating cyclic softening in the technically relevant range, designing complex SL experiments, or analyzing stress-strain hystereses.
Article
Chemistry, Physical
Andreas Abel, Julian M. Rosalie, Stefan Reinsch, Pawel Zapala, Heiner Michels, Birgit Skrotzki
Summary: Iron aluminides have attracted significant interest due to their good oxidation resistance, low density, and potential for high temperature strength. This study focused on the effects of alloying concentrations on microstructure and mechanical properties. The results showed that decreasing boron and molybdenum content resulted in lower strength, but surprisingly, alloys with lower molybdenum content exhibited similar or even superior strength compared to alloys with higher molybdenum content. The study highlights the importance of considering combined effects of alloying concentrations in iron aluminides.
Article
Computer Science, Interdisciplinary Applications
Hossein Beygi Nasrabadi, Thomas Hanke, Matthias Weber, Miriam Eisenbart, Felix Bauer, Roy Meissner, Gordian Dziwis, Ladji Tikana, Yue Chen, Birgit Skrotzki
Summary: This paper introduces the digitalization of mechanical testing laboratories using Industry 4.0 technologies. The development of a mechanical testing ontology and the conversion of heterogeneous experimental data to standardized RDF data formats are key components of the digital lab infrastructure. The proposed approach allows industries to access trustworthy and traceable mechanical testing data from other organizations, facilitating faster and cheaper product development.
COMPUTERS IN INDUSTRY
(2023)
Article
Engineering, Manufacturing
Yue Chen, Markus Schilling, Philipp von Hartrott, Hossein Beygi Nasrabadi, Birgit Skrotzki, Jurgen Olbricht
Summary: In recent years, the design and development of materials have become closely connected to the advancement of digital technologies. Efficient data management plays a vital role in material digitization, and effective solutions for data standardization and sharing are necessary in the field of materials science and engineering (MSE). Ontologies, which represent concepts and relationships in MSE, are used to achieve these goals. Graphical editing based on standard conceptual modeling languages has gained popularity due to its simplicity and user-friendliness. This approach is also adopted by the Materials-open-Laboratory project (Mat-o-Lab) to develop domain ontologies and method graphs based on testing standards in the MSE field. To meet the needs of domain experts in the project, Ontopanel was created as a plugin for the widely used open-source graphical editor diagrams.net, enabling graphical ontology editing. Ontopanel includes a set of pipeline tools for ontology development in diagrams.net, such as ontology import, conversion to Web Ontology Language (OWL), OWL rule verification, and data mapping. It simplifies the learning process for domain experts by eliminating the need to switch between different tools. This study demonstrates the utilization of Ontopanel through a use case involving Brinell hardness testing.
INTEGRATING MATERIALS AND MANUFACTURING INNOVATION
(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)
