Review
Materials Science, Multidisciplinary
Linlin Li, Zhenjun Zhang, Peng Zhang, Zhefeng Zhang
Summary: This review article summarizes the profound understanding of fatigue cracking mechanisms of various twin boundaries (TBs). Factors such as grain orientations, stacking fault energy, and interface structure have significant influences on the fatigue cracking behaviors of TBs. This knowledge provides important guidance for enhancing the fatigue performance of materials through interfacial design.
PROGRESS IN MATERIALS SCIENCE
(2023)
Article
Materials Science, Multidisciplinary
Kaimeng Wang, Hongyang Jing, Lianyong Xu, Lei Zhao, Yongdian Han, Kai Song, Xueyan Qi, Molin Su
Summary: The fracture mechanism and microstructure evolution of a Nickel based alloy under high-temperature cyclic loading were investigated. Low cycle fatigue tests were conducted at different temperatures, and the deformation and crack propagation behavior of the material were observed. It was found that temperature affects the fracture pattern and grain boundary strength of the material.
MATERIALS CHARACTERIZATION
(2022)
Article
Nanoscience & Nanotechnology
Jiangkun Fan, Wenyuan Zhang, Bobo Li, Kaidi Li, Yang Wang, Peng Jiang, Chuanyun Wang, Xiangyi Xue, Hongchao Kou, Jinshan Li
Summary: This study systematically characterized the activation of deformation systems in Ti-6Al-3Nb-2Zr-1Mo (Ti6321) alloy under in situ tensile and quasi-in situ dwell fatigue tests. The critical resolved shear stresses of basal and prismatic slip systems in the alloy were calculated using slip trace analysis. The study revealed that basal and prismatic slips were the major microscopic deformation modes during dwell fatigue, with basal slip being predominant. The results indicated that the elastic anisotropy of the hexagonal-closed-packed (HCP) structure could induce heterogeneous microscopic stress and activate basal slip activities, which played a role in crack initiation through basal plane and (0001) twist boundary cracks.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
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
Nanoscience & Nanotechnology
Y. Zhao, R. Jiang, A. Harte, D. J. Bull, P. A. S. Reed
Summary: This study characterizes the strain localization under cyclic loading in an advanced powder metallurgy Ni-based superalloy at 450°C. The results show that strain mainly accumulates in slip/strain bands, and the strain saturates at 1000 cycles. The strain bands mainly consist of shear strain along the strain band and transverse strain normal to the strain band.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Materials Science, Multidisciplinary
Maral Sarebanzadeh, Alberto Orozco-Caballero, Javier LLorca
Summary: The transfer of basal-to-basal slip across grain boundaries was studied in weakly-textured pure Mg specimens deformed in tension using slip trace analysis and electron back-scatterer diffraction. Basal slip was the dominant deformation mechanism in most grains, and the transfer/blocking of slip at grain boundaries was examined. The active slip system(s) in the grains were determined by analyzing the rotation of grains caused by plastic slip along the basal slip systems. Additionally, the orientation of grain boundaries was measured to determine the twist angle theta.
Article
Materials Science, Multidisciplinary
Yahui Liu, Qianqian Zhu, Kexing Song, Yanjun Zhou, He Liu, Xiaokang Yang, Shifeng Liu, Lingfei Cao
Summary: This study investigates the deformation mechanism of tantalum sputtering target using the electron backscatter diffraction method. The results show that the orientation density increases after deformation, lattice rotation causes misorientation between grains, and the activation of slip systems is related to strain concentration.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Materials Science, Multidisciplinary
Shiyu Suzuki, Motoki Sakaguchi, Masaya Domen, Takanori Karato, Kenta Suzuki
Summary: The effects of grain boundaries on fatigue crack propagation in a cast Ni-base superalloy were investigated. The study found that grain boundaries can retard the propagation of shear cracks and accelerate the propagation of cracks along high angle boundaries. Secondary cracks can also be nucleated along high angle boundaries.
Article
Engineering, Mechanical
Xiangkang Zeng, Conghui Zhang, Wenguang Zhu, Mingliang Zhu, Yanmou Wang, Xin Zhang
Summary: The short fatigue crack growth behavior of zirconium was quantitatively investigated, and it was found that the cracks mainly propagated transgranularly and were sensitive to the crystallographic orientation. The cracks often deflected at grain boundaries and preferred to propagate along specific slip planes. A method for evaluating crack growth across grain boundaries was proposed.
INTERNATIONAL JOURNAL OF FATIGUE
(2022)
Article
Materials Science, Multidisciplinary
Julien Prouteau, Patrick Villechaise, Loic Signor, Jonathan Cormier
Summary: This paper investigates the crack initiation mechanisms in polycrystalline Ni-based superalloys, finding that cracks mainly occur along twin boundaries. The impact of loading conditions and grain structure on crack initiation is studied.
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
(2023)
Article
Engineering, Aerospace
Duoqi Shi, Tianxiao Sui, Zhenlei LI, Xiaoguang Yang
Summary: This paper proposes a creep life evaluation method considering the effect of crystallographic orientation. The method calculates the equivalent stress by introducing the maximum Schmid factor and lattice rotation angle, and adopts the Larson Miller Parameter (LMP) method as the rupture life evaluation criteria. The predictions show high accuracy and indicate that the orientation-dependent method is reliable at intermediate temperatures.
CHINESE JOURNAL OF AERONAUTICS
(2022)
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
Nanoscience & Nanotechnology
Zhaowen Huang, Donghui Wen, Xionghua Jiang, Anding Wang, Yusheng Li, Yang Cao, Xiaodong Hou, Biao Wang, Yuntian Zhu
Summary: The slip system variations induced by excess yield stress in Ti at the early stage of plastic deformation were studied in-depth. It was found that normal grain refinement and suppressed dislocation source activation in refined-grain can significantly increase the yield stress. Combined calculations of Schmid factor and critical resolved shear stress showed that small-grain samples with higher yield stress can activate both < a >-prismatic slip and < c+a >-pyramidal slip, while large-grain samples can only activate < a >-prismatic slip. This slip system transition can explain the abnormal fine-grain strengthening effect and stress drop after yielding in Ti.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Materials Science, Multidisciplinary
Wei Li, Songsong Li, Hui Yu
Summary: The plastic behavior and deformation mechanism of textured pure titanium were studied using uniaxial tensile tests, crystal orientation observation, and Schmid law analysis. The results show that there is an obvious strain rate effect and anisotropy in the yield and hardening behaviors of the material. The study also reveals that different tensile directions have different yield mechanisms, and both twinning polarity and Schmid law have an effect on twinning activation.
MATERIALS CHARACTERIZATION
(2022)
Article
Materials Science, Multidisciplinary
Apratim Chakraborty, Waqas Muhammad, Jean-Philippe Masse, Reza Tangestani, Morteza Ghasri-Khouzani, Andrew Wessman, Etienne Martin
Summary: In this study, the inherent micro-cracking mechanisms in two different high-γ' Ni-based superalloys processed by laser powder bed fusion (LPBF) were investigated. The REN & PRIME;E 65 (R65) alloy with a lower γ' volume fraction showed lower micro-cracking density compared to the REN & PRIME;E 108 (R108) alloy with a higher γ' volume fraction. The microcracks were found to propagate along high angle boundaries (HABs) and were predominantly caused by solidification cracking. This research also found that Hf and Zr segregation along the grain boundaries increased the susceptibility to micro-cracking.
Article
Engineering, Mechanical
Xu Jia, Zi-wen Zhang, Chen Ling, Xu-ping Lu, Rong Jiang, Ying-Dong Song
Summary: This study conducted high-speed ballistic impact tests and fatigue tests on GH4169 alloy samples to investigate the effect of FOD depth on fatigue strength. It was found that as the FOD depth increases, the damage length, material losses, and stress concentration coefficient also increase, resulting in a reduction in fatigue strength. The study also showed that the Kitagawa-Takahashi diagram can be used as a basic model for the design of FOD tolerance.
FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES
(2022)
Article
Engineering, Mechanical
C. You, A. G. Sanchez, M. Leering, D. Glaser, D. Furfari, M. E. Fitzpatrick, J. Wharton, P. A. S. Reed
Summary: The study revealed that critical surface imperfections significantly reduce the benefits of laser shock peening in improving fatigue life. A finite element model can be used to simulate residual stress distribution induced by LSP and its redistribution caused by the formation of surface pits.
INTERNATIONAL JOURNAL OF FATIGUE
(2022)
Article
Engineering, Mechanical
W. T. Zhang, R. Jiang, Y. Zhao, L. C. Zhang, L. Zhang, L. G. Zhao, Y. D. Song
Summary: The macro and mesoscale deformation and damage of the PM nickel-based superalloy FGH4098 under low cycle fatigue loading at elevated temperatures were investigated. The results indicate that higher temperature leads to more severe macroscale damage and shorter fatigue life. The distribution and evolution of fatigue damage are strongly affected by local stress-strain state and temperatures.
INTERNATIONAL JOURNAL OF FATIGUE
(2022)
Article
Nanoscience & Nanotechnology
Jiahui Dong, Nong Gao, Ying Chen, Lingfei Cao, Hui Song, Hannes Froeck, Benjamin Milkereit, Marco J. Starink
Summary: The combined effects of high pressure torsion and age hardening were investigated on a 3rd generation Al-Cu-Li alloy. The results showed that the novel multi-stage processes significantly improved the hardness of the alloy and refined its microstructure.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Engineering, Mechanical
Rong Jiang, Wentian Zhang, Leicheng Zhang, Yang Zhao, Lu Zhang, Yingdong Song
Summary: The strain localization and crack initiation behavior of a powder metallurgy nickel-based superalloy under low cycle fatigue loads at room temperature was investigated. The effect of elastic anisotropy and local microstructure on fatigue failure was analyzed. Crystal plasticity simulation and characterization techniques were used to predict crack initiation sites based on selected fatigue indicator parameters. Fatemi-Socie parameter was found to be a promising metric for crack initiation prediction.
FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES
(2022)
Article
Materials Science, Multidisciplinary
Donghyuk Kim, Rong Jiang, Ian Sinclair, Philippa Reed
Summary: The effects of unimodal secondary gamma' size and grain orientation on fatigue crack initiation and early crack propagation at room temperature were investigated in RR1000 alloy. The results showed that cracks mainly initiated at slip bands and/or pores followed by crystallographic facet formation. More diffuse strain localisation around the pores was observed by SEM-DIC analysis. Fatigue lifetime was found to be linked to the number of crack initiations and consequent crack coalescence, which accelerated crack propagation. Slip trace analysis with EBSD mapping indicated that cracks are likely to propagate along the primary active slip system with a relatively high Schmid Factor. In the conducted tests, the stochasticity of crack initiation events had a greater impact on overall lifetime than variations in secondary gamma' size.
MATERIALS SCIENCE AND TECHNOLOGY
(2022)
Article
Mechanics
Xu Jia, Chen Ling, Ziwen Zhang, Rong Jiang, Yingdong Song
Summary: This study investigates the impact of different incident foreign object damage (FOD) depths on the high-cycle fatigue (HCF) performance of TC11 titanium alloy specimens. Results show that increasing damage depth leads to higher stress concentration factors, greater material losses, and decreased fatigue strength. The study provides useful insight for assessing the notchtype FOD degree of TC11 titanium alloy leading edge blades.
ENGINEERING FRACTURE MECHANICS
(2022)
Article
Nanoscience & Nanotechnology
Y. Zhao, R. Jiang, A. Harte, D. J. Bull, P. A. S. Reed
Summary: This study characterizes the strain localization under cyclic loading in an advanced powder metallurgy Ni-based superalloy at 450°C. The results show that strain mainly accumulates in slip/strain bands, and the strain saturates at 1000 cycles. The strain bands mainly consist of shear strain along the strain band and transverse strain normal to the strain band.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Materials Science, Multidisciplinary
Ahmed S. J. Al-Zubaydi, Nong Gao, Jan Dzugan, Pavel Podany, Sandeep Sahu, Deepak Kumar, Ying Chen, Philippa A. S. Reed
Summary: The tensile properties of an ultrafine-grained Al-9%Si-3%Cu alloy deposited by the laser powder bed fusion process were investigated in this study. The processed alloy exhibited higher strength and elongation, and the room temperature processing improved the microstructure of the alloy.
JOURNAL OF MATERIALS SCIENCE
(2022)
Article
Nanoscience & Nanotechnology
L. C. Zhang, R. Jiang, Y. C. Wang, L. Zhang, J. T. Liu, Y. W. Zhang, Y. D. Song
Summary: This study investigates the short fatigue crack propagation behavior of a powder metallurgy superalloy (FGH4098) for aeroengine turbine disc application. The results show that the grain boundary oxidation has a significant influence on the crack propagation, and the temperature has a more evident effect on the fine-grained FGH4098 compared to the coarse-grained FGH4098.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Materials Science, Multidisciplinary
C. H. Wu, R. Jiang, L. C. Zhang, Y. C. Wang, Y. Chen, Y. D. Song
Summary: This study investigates the fatigue crack growth (FCG) mechanisms of Ni-based superalloy FGH4098 at temperatures ranging from 650 to 800 degrees Celsius. The results show that the FCG rate increases by 2-3 orders of magnitude with increased temperature and prolonged dwell time, which is attributed to grain boundary oxidation. Characterization of the crack tips reveals that deformation, such as dislocations and stacking faults, mainly occurs within the gamma channel, accompanied by a change in grain orientation due to severe deformation. Pre-formed oxides at uncracked grain boundaries facilitate the FCG process. A mechanism map of the interaction between deformation-assisted grain boundary oxidation and FCG is proposed.
Article
Materials Science, Multidisciplinary
D. Kim, R. Jiang, P. A. S. Reed
Summary: The effects of microstructure and oxidation on fatigue crack initiation and early propagation processes were investigated in RR1000 turbine disc alloy with different gamma' and carbide distributions. Fatigue tests were conducted at 650 degrees C in air using three-point bending and trapezoidal waveform loading. Intergranular features were clearly observed in both gamma' variants, with fatigue cracks initiating at grain boundaries containing Co-rich oxides and interfaces between carbides and grain boundaries due to oxidation damage under applied loading. Enhanced fatigue crack growth rates were attributed to significant intergranular crack initiation and frequent crack coalescence events, particularly where more continuous carbides exist at the grain boundary.
JOURNAL OF MATERIALS SCIENCE
(2023)
Article
Nanoscience & Nanotechnology
Yuanguo Tan, Nong Gao, Philippa Reed
Summary: Understanding the mechanism of oxidation induced crack closure is crucial for understanding the fatigue resistance of materials at intermediate or high temperatures subjected to oxidation. Current research shows that the occurrence of crack closure is closely related to test frequencies and temperatures, rather than the microstructure of a directionally solidified superalloy. Three-dimensional X-ray scanning tomography (CT) and two-dimensional scanning electron microscopy (SEM) with attached energy-dispersive X-ray spectroscopy (EDX) are combined to capture the oxides formed within the crack wake. The experimental and modeling results both demonstrate that external oxides formed near the crack tip lead to a significant crack closure due to high crack tip opening displacement.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Engineering, Mechanical
Yuanguo Tan, Sari Octaviani, Nong Gao, Philippa A. S. Reed
Summary: The effects of mechanical and microstructural anisotropy on the fatigue crack initiation and propagation behaviors of a directionally solidified superalloy were studied. It was found that, when the applied stress is close to the yield stress, specimens with longitudinally aligned grains have shorter fatigue lives compared to those with transversely loaded grains. This can be mainly attributed to the lower Young's modulus of the longitudinal specimens, which induces more local plastic strain and leads to earlier crack initiation and faster crack propagation.
FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES
(2023)
Article
Engineering, Mechanical
R. Jiang, Y. C. Wang, L. C. Zhang, Y. Chen, H. Zhang, Z. B. Wang, Y. D. Song
Summary: Constant load amplitude, Delta K fatigue crack propagation (FCP) tests were conducted to investigate the FCP behavior of the grain size transition zone in a dual microstructure turbine disc. The results indicate that grain size has a more significant influence in the time-dependent FCP regime, but its effect is relatively limited in the cycle-dependent FCP regime. A larger local plastic deformation zone is observed in the fine-grained region, which is believed to be the cause of more significant grain boundary oxidation, resulting in accelerated FCP through the contribution of more grain boundaries acting as short-circuit diffusion paths of oxide-forming elements.
INTERNATIONAL JOURNAL OF FATIGUE
(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)
