Article
Chemistry, Physical
Suketa Chaudhary, Namit Pai, G. Appa Rao, Zafir Alam, R. Sankarasubramanian, P. J. Guruprasad, Indradev Samajdar, Anirban Patra
Summary: A crystal plasticity modeling framework is developed and validated in this study for investigating the deformation behavior of a polycrystalline Ni-based superalloy. The model takes into account the various strengthening mechanisms observed in the alloy and successfully predicts the stress-strain response and misorientation development at different temperatures.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Multidisciplinary
Masayuki Kamaya, Naoko Maekawa
Summary: Numerous studies have used electron backscatter diffraction to assess plastic strain in polycrystalline materials. However, it is difficult to quantitatively assess the misorientation between adjacent measurement points due to measurement conditions. This study proposes a method for estimating the correlation curve between local misorientation and plastic strain, called the master curve, based on the characteristics of the misorientation parameters under different conditions.
MATERIALS CHARACTERIZATION
(2023)
Article
Materials Science, Multidisciplinary
Wang Jiapo, Liang Jianwei, Wen Zhixun, Yue Zhufeng, Peng Yan
Summary: The study established atomic models for typical microstructures in nickel-based single crystals and conducted nanoindentation MD simulations. It found that plastic deformation is divided into P-i and P-u stages, with the behavior influenced by dislocation nucleation and emission.
MECHANICS OF MATERIALS
(2022)
Article
Nanoscience & Nanotechnology
G. Hachet, A. Oudriss, A. Barnoush, T. Hajilou, D. Wang, A. Metsue, X. Feaugas
Summary: This study evaluated the impact of hydrogen on the dislocation structures formed during cyclic pre-straining of nickel single crystal through a series of nanoindentation tests. It was found that hydrogen induced changes in hardness, highlighting the competition between hardening and softening processes. Pre-charging hydrogen softened the dislocation microstructures, while hydrogen ingress induced a hardening effect due to a pinning effect by the solute on the dislocations.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Nanoscience & Nanotechnology
Kwangsik Kwak, Tsuyoshi Mayama, Yoji Mine, Katsuhiko Ohishi, Tomonori Ueno, Kazuki Takashima
Summary: The anisotropy in the mechanical properties of 601 nickel-based superalloy fabricated using wire-arc additive manufacturing (WAAM) was investigated through multiscale tensile testing combined with crystal plasticity analysis. The study found that there was anisotropy in the fracture strain and work-hardening behavior of the millimeter-scale specimens composed of columnar grains, despite the yield stress being approximately constant. The micrometer-scale specimens, which were single crystals with dendrites, exhibited limited influence of dendrite formation on the yielding behavior of columnar grains.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Chemistry, Physical
Shahriyar Keshavarz, Carelyn E. Campbell, Andrew C. E. Reid
Summary: This study focuses on modeling and predicting the creep behaviors of two-phase gamma-gamma' nickel-based superalloys using multi-scale approaches and crystal plasticity finite element platforms. The model considers the morphology and composition of the gamma' phase, and links the sub-grain and homogenized scales to capture the complexity of the system responses.
Article
Chemistry, Multidisciplinary
Andrew J. Lew, Cayla A. Stifler, Alexandra Tits, Connor A. Schmidt, Andreas Scholl, Astrid Cantamessa, Laura Mueller, Yann Delaunois, Philippe Compere, Davide Ruffoni, Markus J. Buehler, Pupa U. P. A. Gilbert
Summary: Biominerals, the hardest and toughest tissues in living organisms, are often polycrystalline with varying mesostructures. Marine biominerals such as coral skeletons and nacre, consisting of different calcium carbonate polymorphs, share a common characteristic of slight crystal misorientation. Nanoindentation and molecular dynamics simulations show that this slight misorientation can significantly increase fracture toughness. This phenomenon can be utilized in the synthesis of bioinspired materials without the need for multiple materials or specific top-down architecture.
ADVANCED MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
P. K. Jayashree, M. C. Gowrishankar, Sathyashankara Sharma, Raviraj Shetty, Pavan Hiremath, Manjunath Shettar
Summary: This study investigates the effect of SiC addition on the welded microstructure of aluminum metal matrix composites, and relates the microstructural changes to the observed mechanical behavior of the welded joints. The research reveals that strength depends not only on the average value of misorientation, but also on the distribution of misorientation in the microstructure.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2021)
Article
Nanoscience & Nanotechnology
Ayako Ikeda, Kenta Goto, Toshio Osada, Ikumu Watanabe, Kyoko Kawagishi
Summary: A new approach has been proposed for the high-throughput experimental evaluation of the phase stability, mechanical properties, and oxidation properties of a Ni-based superalloy. The method involves using the Bridgman technique to introduce a gradation of nine elements and a wide range of microstructural features in a single sample. This approach allows for a large number of datasets to be obtained related to the composition and microstructure of the superalloys.
SCRIPTA MATERIALIA
(2021)
Article
Chemistry, Physical
Zuheng Jin, Lina Jia, Chengtong Ye, Wenbo Wang, Hu Zhang
Summary: In this study, the nano-hardness and elastic modulus on different crystal planes in Nb-Si alloys were investigated using nanoindentation, and the relationship between microcosmic fracture toughness and crystal orientation was predicted. A crystallographic model of the phase boundary between Nbss and α-Nb5Si3 was established based on EBSD analysis, and the deformation mechanisms of Nbss were explained using the Easy-slip model.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Physical
Emil Eriksson, Fabian Hanning, Joel Andersson, Magnus Hornqvist Colliander
Summary: Understanding the microstructural behaviour of materials during thermomechanical processing is crucial for achieving optimal mechanical properties. We investigated the dynamic recrystallization (DRX) behaviour of Ni-base superalloy Haynes 282 during hot compression and observed the formation of small DRX grains before the peak strain. The DRX process accelerated significantly above a certain strain, and the material was fully recrystallized at a higher strain. Contrary to common assumptions, many DRX grains contained dislocation substructures, even at small strains.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Engineering, Mechanical
Piao Li, Wen Jiang, Shao-Shi Rui, Wei-xing Yao, Hui-ji Shi, Qi-nan Han, Jie Huang
Summary: The study reveals that the misorientation of nickel-base single crystal superalloy can affect its fatigue life, and the actual misorientation angle's impact on fatigue life has been quantified for the first time.
INTERNATIONAL JOURNAL OF FATIGUE
(2021)
Article
Materials Science, Multidisciplinary
D. F. Shi, Z. J. Zhang, Y. H. Yang, Y. Z. Zhou, R. Liu, P. Zhang, Z. F. Zhang
Summary: Nickel-based single-crystal superalloys are widely used in manufacturing aeroengine turbine vanes due to their excellent high-temperature performance. However, the presence of low-angle grain boundaries (LAGBs) during their manufacture can weaken the mechanical properties of the superalloys. In this study, the relationship between grain boundary misorientation (GBM) and fatigue properties of superalloys at elevated temperatures was systematically investigated using six different bicrystals with varying tilt LAGBs. The study found that an increase in GBM led to an increase in GB precipitates and cast micropores, resulting in a decrease in fatigue life and fatigue strength. The study also established a quantitative fatigue strength prediction model and evaluated the coupling effect of cast micropores and GBM on the fatigue damage mechanisms of the bicrystals.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2023)
Article
Engineering, Mechanical
Run-Zi Wang, Lv-Yi Cheng, Shun-Peng Zhu, Peng-Cheng Zhao, Hideo Miura, Xian-Cheng Zhang, Shan-Tung Tu
Summary: A large number of strain-controlled creep-fatigue tests were conducted at 650 degrees Celsius on nickel-based forged GH4169 superalloy under wide loading waveforms. Post-test examinations included comprehensive characterizations using scanning electron microscope, electron backscatter diffraction, and transmission electron microscope. The study found that strain ratio has little influence on creep-fatigue damage degrees, while dwell time causes noticeable changes to damage progressions.
INTERNATIONAL JOURNAL OF FATIGUE
(2021)
Article
Nanoscience & Nanotechnology
M. Kreins, S. Schilli, T. Seifert, A. H. S. Iyer, M. H. Colliander, S. Wesselmecking, U. Krupp
Summary: The plasticity of single crystal micro-cantilevers is significantly influenced by dislocation interaction and dislocation pile-up at the neutral plane, and their ratio is determined by the activated slip systems. In multi slip orientation, activation of the second slip system leads to more dislocation sources being activated, resulting in an earlier and more uniform elastic-plastic transition zone.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Nanoscience & Nanotechnology
Ahmad Mirzaei, Peter D. Hodgson, Xiang Ma, Vanessa K. Peterson, Ehsan Farabi, Gregory S. Rohrer, Hossein Beladi
Summary: This study investigated the influence of parent austenite grain refinement on the intervariant boundary network in a lath martensitic steel. It found that refining the parent austenite grain led to a decrease in the fraction of certain boundaries in the martensite and an increase in the connectivity of low energy boundaries, ultimately improving the impact toughness.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
N. L. Church, C. E. P. Talbot, L. D. Connor, S. Michalik, N. G. Jones
Summary: Metastable beta Ti alloys based on the Ti-Nb system have attracted attention due to their unique properties. However, the unstable cyclic behavior of these alloys has hindered their widespread industrial use. Recent studies have shown that internal stresses, including those from dislocations, may be responsible for this behavior. This study demonstrates that inter-cycle thermal treatments can mitigate the unstable cyclic behavior, providing a significant breakthrough in our understanding of Ti-Nb superelastic materials.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Di Zhao, Chenchen Zhao, Ziyang Xiu, Jiuchun Yan
Summary: This study proposes a novel strategy for achieving the bonding of SiC ceramic and Al alloy using ultrasound. The ultrasound promotes the dissolution of Al into the solder, activating the solder and triggering the interfacial reaction between SiC ceramic and solder. With increasing ultrasonic duration, the bonding between SiC and Al transitions from partial to full metallurgical bonding.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Kang Du, Yang Zhang, Guangda Zhao, Tao Huang, Liyuan Liu, Junpeng Li, Xiyu Wang, Zhongwu Zhang
Summary: This paper systematically investigated the evolution of microstructure in Fe-Ni-Co-Al polycrystalline alloys and its effects on mechanical properties. The results revealed that the migration of grain boundaries in different processes is driven by different factors, which impacts the grain orientation and precipitate formation. In the process of directional recrystallization, grains with specific orientations grow in the grain boundary region and form the dominant orientation, while grains with lower migration rate form the minor orientation. The alloy produced through directional recrystallization exhibited good recoverable strain and superelastic strain, while the alloy produced through solid solution treatment showed no evident superelastic behavior.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Edohamen Awannegbe, Liang Chen, Yue Zhao, Zhijun Qiu, Huijun Li
Summary: This study employed laser metal deposition to additively manufacture Ti-15Mo wt% alloy, and subsequently subjected it to post-fabrication uniaxial thermomechanical processing. The results showed that different zones in the microstructure remained after processing, and deformation mechanisms mainly involved slip and martensite formation. The compressive mechanical properties were found to be dependent on strain rate, with higher flow stress and compressive strength observed at higher strain rates. Grain structure homogenisation was not achieved, leading to anisotropic tensile properties.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Reza Khatib Zadeh Davani, Enyinnaya George Ohaeri, Sandeep Yadav, Jerzy A. Szpunar, Jing Su, Michael Gaudet, Muhammad Rashid, Muhammad Arafin
Summary: This research aims to investigate the effect of roughing and finishing reductions on crystallographic texture. The results show significant heterogeneity in the centerline region, with higher intensity of certain textures. Drop Weight Tear Test indicates that steel specimens with lower and medium reductions exhibit superior low-temperature impact toughness compared to steel with higher reductions. The electrochemical hydrogen charging experiments confirm the presence of internal hydrogen cracks only in steel with lower and medium reductions.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Flavio De Barbieri, Denis Jorge-Badiola, Rodrigo Allende, Karem Tello, Alfredo Artigas, Franco Perazzo, Henry Jami, Juan Perez Ipina
Summary: This study examines the effect of Cr additions on the mechanical behavior of TWIP steel at temperatures ranging from 25°C to 350°C. The results indicate that different temperature-dependent strengthening mechanisms, including mechanical twinning, Dynamic Strain Aging, and slip bands, are at play. The stacking fault energy (SFE) influences the percentage of mechanical twinning, which in turn affects the strain hardening rate.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Hanlin Peng, Siming Huang, Ling Hu, Bingbing Luo, Liejun Li, Ian Baker
Summary: This study explores the weldability, microstructures, and mechanical properties of two L1(2)-nanoparticle-strengthened medium-entropy alloys after electron beam welding (EBW). The results show that strong yet ductile defect-free joints were produced, with larger grain sizes in the fusion zones compared to the heat-affected zones and base materials. Both EBWed MEAs exhibited high yield strengths, high ultimate tensile strengths, and good fracture strains at 77 K. The V-doping improved the cryogenic mechanical properties of the TMT MEA.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Yongxin Wang, Lei Chen, Lizi Shao, Shuo Hao, Motomichi Koyama, Xingzhou Cai, Xiaocong Ma, Miao Jin
Summary: This study investigated the tensile deformation behavior of an Mn-N bearing lean duplex stainless steel with metastable austenite. The results showed that the strain rate had significant influence on the work hardening, strain-induced martensitic transformation, and fracture mechanism.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Jong Woo Won, Seulbi Lee, Hye-Jeong Choe, Yong-Taek Hyun, Dong Won Lee, Jeong Hun Lee
Summary: Cold-rolled pure titanium showed improved sheet formability after undergoing cryogenic-deformation treatment. This treatment increased the thinning capability of the titanium and suppressed cracking during sheet forming. The formation of twins during deformation contributed to high thinning capability and increased strength through grain refinement and dislocation accumulation.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Handong Li, Lin Su, Lijuan Wang, Yanbin Jiang, Jiahui Long, Gaoyong Lin, Zhu Xiao, Yanlin Jia, Zhou Li
Summary: Homogenization heat treatment is a key procedure in controlling the second phase, enhancing composition uniformity, and workability of as-cast Cu-15Ni-8Sn alloy. This study found that electropulsing treatment (EPT) can significantly reduce treatment temperature and time, improve elongation and overall mechanical properties of the alloy.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Yuxuan Wang, Juntao Zou, Lixing Sun, Yunfei Bai, Zhe Zhang, Junsheng Cheng, Lin Shi, Dazhuo Song, Yihui Jiang, Zhiwei Zhang
Summary: A novel mechanical-heat-electricity synergistic method was proposed to enhance the mechanical properties of Cu-15Sn-0.3Ti alloy by forming annealing twins (ATs). The combination method of Rotary swaging (RS) and Electric pulse treatment (EPT) successfully induced recrystallization and refinement of the microstructure, leading to a significant increase in the strength of the alloy within a short time.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Zhiyi Ding, Jiangtao Xie, Tong Wang, Aiying Chen, Bin Gan, Jinchao Song
Summary: This study demonstrated the Ta-induced strengthening of CoCrNi-AlTi MEAs using nanoscale heterogeneous coherent precipitates. The addition of Ta and aging treatments significantly enhanced the mechanical properties of the alloy, including yield strength, ultimate tensile strength, and elongation.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Z. Y. You, Z. Y. Tang, B. Wang, H. W. Zhang, P. Li, L. Zhao, F. B. Chu, H. Ding
Summary: The mechanical properties and microstructural evolution of C-doped TRIP-assisted HEA under dynamic loading conditions were systematically investigated in this study. The results showed that dynamic tensile deformation led to an increase in yield strength and a decrease in ultimate tensile strength, with a trend towards increased total elongation. The primary deformation mechanisms shifted from TRIP and TWIP effects to deformation twinning and dislocations. The presence of carbides formed through C-doping hindered dislocation slip and promoted the activation of multiple twinning systems.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Feng Qin, Feihu Chen, Junhua Hou, Wenjun Lu, Shaohua Chen, Jianjun Li
Summary: Plastic instability in strong multilayered composites is completely suppressed by architecting nanoscale BCC Nb crystalline-amorphous CuNb interfaces.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)