Article
Chemistry, Physical
Chun-Hao Chen, Yu-Chang Lai, Tung-Han Chuang
Summary: The microstructural evolution of Ag-4Pd ribbon under various annealing conditions was investigated in this study using the EBSD technique. The results showed abnormal grain growth after prolonged annealing treatment, with calculated grain growth time exponent (n) and activation energy providing insights into the dominance of grain boundary diffusion in the material. The deviation of n value and activation energy from those of pure silver could be attributed to alloying elements and twin boundaries within the microstructure.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Materials Science, Multidisciplinary
Xiaotong Chen, Xuefeng Lu, Junqiang Ren, Hongtao Xue, Fuling Tang, Yutian Ding
Summary: The addition of an appropriate amount of Co atoms in the grain boundary region of nano-polycrystalline Ni can enhance the material's tensile strength through solid solution strengthening. However, excessive introduction of solute atoms can lead to the destruction of grain boundary stability and accelerate material yielding. The dislocations are distributed in a grid at the grain boundaries, and their number and length increase with increasing strain, forming a large number of entanglements. The interaction between Shockley dislocation and other dislocations forms a more stable dislocation structure, greatly enhancing the strength of the system.
JOURNAL OF MATERIALS SCIENCE
(2022)
Article
Materials Science, Multidisciplinary
Mingjie Xu, Kongtao Chen, Fan Cao, Leonardo Velasco, Thomas M. Kaufman, Fan Ye, Horst Hahn, Jian Han, David J. Srolovitz, Xiaoqing Pan
Summary: This study presents the mechanism of grain boundary motion in polycrystalline materials through novel observations, simulations, and disconnection theory. The results show that the motion of grain boundaries is coupled through disconnection motion/reactions at grain boundary triple junctions. The driving force for migration affects the mode selection, with different modes observed under chemical potential jump and stress-driven conditions.
Article
Nanoscience & Nanotechnology
Ilias Bikmukhametov, Garritt J. Tucker, Gregory B. Thompson
Summary: Depositing a Ni-1at. % P film can facilitate the formation of multiple quintuple twin junctions, resulting in a five-fold twin structure and a pentagonal pyramid surface topology. The ability to control material structures offers opportunities for creating novel surface topologies, which can be used as arrays of field emitters or textured surfaces.
SCRIPTA MATERIALIA
(2024)
Article
Chemistry, Physical
M. Matsuda, K. Kiwaki, H. Akamine, M. Nishida
Summary: Microstructure and crystallography of martensite variants in Ti-Pd-Hf alloy were investigated using electron microscopy. The study found that the martensitic transformation temperature decreases with increasing Hf substitution in the Ti50-xPd50Hfx alloy. Martensitic transformation was not observed in the Ti25Pd50Hf25 and Ti10Pd50Hf40 alloys, but plate-like habit-plane variants consisting of major and minor correspondence variants were observed in the Ti40Pd50Hf10, Ti35Pd50Hf15, and Ti30Pd50Hf20 alloys. The martensitic transformation temperature in the Ti50-xPd50Hfx alloy was significantly decreased by nanosized H-phase particles and solute atom clustering.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Nanoscience & Nanotechnology
Lin Wang, Chen Shen, Yuelong Zhang, Fang Li, Ye Huang, Yuhan Ding, Jianwen Xin, Wenlu Zhou, Xueming Hua
Summary: TiAl alloys with different Al content were successfully fabricated using an innovative twin-wire plasma arc additive manufacturing system in this study. The research investigated the effect of Al level on phase composition, microstructure characteristics, microhardness, and tensile properties of the alloys. It was found that decreasing Al content led to increased alpha(2) phase content, reduced tetragonal ratio c/a of the gamma phase, decreased lamellar spacing, and increased microhardness. The Ti-48 Al (at.%) alloy demonstrated superior tensile properties due to optimal microstructure characteristics.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Mechanics
Wei Chen, Yuting Wang, Luling Wang, Jianqiu Zhou
Summary: In this study, a theoretical model was established to investigate the crack initiation and propagation mechanisms in AlCoCrFeNi2.1 EHEA material. It was found that B2 precipitates can delay crack initiation and increasing the thickness of FCC lamellae can reduce the maximum tensile stress at the crack tip, thereby suppressing cleavage.
ENGINEERING FRACTURE MECHANICS
(2021)
Article
Chemistry, Physical
Nicolas J. Peter, Daniela Zander, Xumeng Cao, Chunhua Tian, Siyuan Zhang, Kui Du, Christina Scheu, Gerhard Dehm
Summary: This study reports the observation of enhanced oxygen diffusion along crystal defects, specifically dislocations and twin boundaries, in the C15 Al2Ca Laves phase. The presence of oxygen induces structural changes in these defects, leading to the formation of an amorphous oxide. The identification of oxygen-induced transformation at strained defects is important when the material is exposed to air during plastic deformation at elevated temperatures. Rating: 8/10.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Multidisciplinary
Junhua Hou, Jianjun Li, Wenjun Lu
Summary: A novel phenomenon of twin boundary-assisted precipitation of sigma phase in a non-equiatomic quinary high-entropy alloy upon high-temperature annealing was revealed. The diffusion of solutes and subsequent precipitation of sigma phase are mainly driven by the Gibbs free energy difference between the 9R structure and the adjacent matrix, as observed in systematic electron microscope studies. These findings provide a fundamental understanding of sigma phase formation in polycrystalline HEAs.
Article
Materials Science, Multidisciplinary
Zixiang Li, Baohua Chang, Dongqi Zhang, Haoyu Zhang, Zhiyue Liang, Li Wang, Changmeng Liu, Dong Du
Summary: In this study, Ti2AlNb-based alloy was successfully prepared using an unconventional method and post-heat treatment was conducted to optimize its mechanical performance. The results showed that with proper heat treatment, the high temperature tensile strength of the samples reached a high level, promoting the application of this alloy in the aerospace field.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2023)
Article
Materials Science, Ceramics
Jili Ding, Hongjie Xu, Zhiguang Shi, Xuan Li, Tao Zhang
Summary: The influence of primary alpha-Fe precipitation on thermal and magnetic properties was investigated by producing Fe76.5-xCu1NbxSi13.5B9 (x=0, 1, 2 and 3) amorphous/nanocrystalline ribbons through melt-spinning. It was found that rapid quenching and heat treatment had similar effects on alpha-Fe precipitation. By optimizing components and heat treatment, magnetic properties of the ribbons could be significantly improved.
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2021)
Article
Materials Science, Multidisciplinary
Shunmeng Zhang, Kai Xiong, Ruixia Yang, Hua Dai, Haijun Wu, Junjie He, Yingwu Wang, Li Wu, Yong Mao
Summary: This study proposes a new melting fluxing technique to investigate the microstructure evolution of Ag-50at.%Cu hypereutectic alloy. The results show that increasing undercooling leads to dendrite refinement and disappearance, as well as the formation of cellular lamellar eutectics. Irregular microstructures are observed when the undercooling exceeds a certain range.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Materials Science, Multidisciplinary
Hang Wang, Changsheng Tan, Juan Zhao, Lihong Han, Guojun Zhang
Summary: In this study, high-temperature tensile tests were conducted on TC11 titanium alloy under different creep strains, and the results were analyzed using SEM and TEM. It was found that creep strain, dynamic alpha precipitation, and deformation modes significantly influenced the high-temperature tensile behavior of the alloy. An abnormal characteristic of a stress plateau was observed as the creep strain increased, and a 100 MPa increase in yield strength was achieved with an increase in creep strain from 0.075 to 0.21%. The deformation mechanisms shifted from dislocation slip to the precipitation of nano-sized alpha particles at high creep strains, resulting in a distinct stress plateau in the stress-strain curve.
JOURNAL OF MATERIALS SCIENCE
(2023)
Article
Materials Science, Multidisciplinary
Arjun Kundu, Prasenjit Biswas, Deepak Patel, Jagadish Nayak, Rupesh Kumar Verma, Archana Mallik, Sanjeev Das
Summary: The effect of an electromagnetic field on the solidification mechanism and mechanical properties of twin roll cast aluminum alloy strips was studied. The results showed that high-quality strips can be produced through electromagnetic forced convection at lower pouring temperatures.
Article
Materials Science, Multidisciplinary
Zixiang Yan, Qiang Yang, Fanzhi Meng, Rui Ma, Rirong Bao, Xiaojuan Liu, Jian Meng, Xin Qiu
Summary: In this study, interfacial precipitation in {10 (1) over bar2} twin boundaries of a cold-stamped Mg-12Gd-1.2Zn-0.4Zr alloy was investigated, revealing the formation of new interfacial phases which accelerated peak-aging and improved the alloy's strength. This periodic segregation of Gd + Zn atoms in the twin boundaries played a crucial role in enhancing the mechanical properties of the alloy.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2021)
Article
Materials Science, Multidisciplinary
Brandon Leu, M. Arul Kumar, Paul F. Rottmann, Kevin J. Hemker, Irene J. Beyerlein
Summary: Understanding and controlling the development of deformation twins is crucial for engineering strong and stable hexagonal close-packed (HCP) Mg alloys. This study investigates the elastic strains and stresses around irregular twins using experimental and computational methods, providing insights into the mechanisms of twin development and the microstructural features that influence it.
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
(2023)
Article
Materials Science, Multidisciplinary
Paul G. Christodoulou, Ricardo A. Lebensohn, Irene J. Beyerlein
Summary: This study combines lower-order and higher-order strain-gradient effects into a crystal plasticity FFT-based formulation to investigate the interplay between the length scale introduced by each strain-gradient term at the microscale and the mechanical properties at the macroscale. Results show that increasing the individual LO and HOE length scales affects the hardening rate and strength of the material, respectively. However, when combined, the strong LO hardening is less pronounced than the effect alone.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2022)
Article
Materials Science, Multidisciplinary
Brandon Leu, M. Arul Kumar, Kelvin Xie, Irene J. Beyerlein
Summary: A two-step growth mechanism for {101over line 2} tensile twins blocked by basal-precipitates in precipitate-hardened AZ91 magnesium alloy is proposed based on an elasto-viscoplastic fast-Fourier-transform (EVP-FFT) model. The stress fields resulting from the interaction of two sequentially propagated twins with a precipitate promote twin growth at the twin-precipitate junction. This mechanism explains the existence of thick twin domains in these material systems despite the hindrance of twin growth in precipitate-hardened Mg alloys.
Article
Materials Science, Multidisciplinary
Behnam Ahmadikia, Leyun Wang, M. Arul Kumar, Irene J. Beyerlein
Summary: By using mechanical testing, scanning electron microscopy, and a unified crystal plasticity framework, this study examines the intense and localized slip bands on prismatic planes and {1012} 1011 tensile twins in commercially pure titanium, as well as their transmission across grain boundaries. The results demonstrate that the orientation and curvature of the grain boundaries significantly affect the local stress fields and consequently the transmission of slip/twin. The neighboring grain properties, including active slip systems, slip bands, and twins, also play a crucial role in the deformation mechanisms.
Article
Engineering, Multidisciplinary
R. Sancho, V. Rey-de-Pedraza, P. Lafourcade, R. A. Lebensohn, J. Segurado
Summary: An FFT-based algorithm is proposed to simulate the propagation of elastic waves in heterogeneous domains. The method incorporates the application of Dirichlet boundary conditions and uses a stable beta-Newmark approach for time discretization. By solving the equilibrium equations in Fourier space and employing a preconditioned Krylov solver, the method achieves high accuracy and computational efficiency. Numerical examples demonstrate its effectiveness in simulating wave propagation in different mediums.
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
(2023)
Article
Chemistry, Physical
Jiaxiang Wang, Mariyappan Arul Kumar, Irene J. Beyerlein
Summary: This work investigates the effect of alloying addition on the transformation of twin-twin interactions into crossed-twin structures in magnesium alloys. The study reveals the influence of plastic anisotropy and alloying elements on the formation of crossed twin structures. It proposes that the proper choice of alloying elements can hinder the formation of crossed twin structures and improve the ductility of magnesium alloys.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Multidisciplinary
Miroslav Zecevic, Ricardo A. Lebensohn, Laurent Capolungo
Summary: This paper presents a new formulation and numerical implementation of a strain-gradient crystal plasticity model within a large-strain elasto-viscoplastic fast Fourier transform-based micromechanical model. The model is used to study the formation of kink bands during layer-parallel compression of nano-metallic laminates. The interaction between dislocations and interfaces is considered in the model to accurately simulate the behavior of the layered composites.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2023)
Article
Crystallography
Mariyappan Arul Kumar, Marcin Wronski, Irene J. Beyerlein
Summary: Hexagonal close-packed (HCP) magnesium alloys are widely used in automotive and aerospace industries due to their low density and high specific-strength. However, their poor formability and pronounced plastic anisotropy limit their applicability. This work proposes that the formability of Mg alloys can be improved by combining grain refinement and alloying approaches. A crystal-plasticity-based constitutive model is developed to quantitively explore this possibility and identify the optimal microstructure and chemistry for desired Mg alloy performance.
Article
Metallurgy & Metallurgical Engineering
Krishna Yaddanapudi, Mariyappan Arul Kumar, Jiaxiang Wang, Xin Wang, Timothy J. Rupert, Enrique J. Lavernia, Julie M. Schoenung, Irene J. Beyerlein, Subhash Mahajan
Summary: This study investigates the effects of twin-twin interactions on the distribution of defects and stress fields in a magnesium alloy. The analysis focuses on a specific twin junction in a deformed Mg-3wt.%Y alloy. The results show that the morphology of the twins is asymmetric and the dislocations concentrate near the twin-twin junction site. Crystal plasticity calculations suggest that the local stress fields generated at the junction site are responsible for the observed concentration of dislocations. These findings provide insights into the twinning behavior and mechanical properties of Mg alloys.
JOURNAL OF MAGNESIUM AND ALLOYS
(2023)
Article
Engineering, Mechanical
C. K. Cocke, H. Mirmohammad, M. Zecevic, B. R. Phung, R. A. Lebensohn, O. T. Kingstedt, A. D. Spear
Summary: This study extends a large-strain FFT-based crystal plasticity model to simulate ductile fracture of polycrystalline materials. By incorporating a triaxiality-based continuum damage mechanics (CDM) formulation into a large-strain elasto-viscoplastic FFT (LS-EVPFFT) framework and using an integral-based nonlocal regularization approach, the model is able to accurately predict the macroscopic stress-strain response and necking behavior of ductile polycrystals.
INTERNATIONAL JOURNAL OF PLASTICITY
(2023)
Article
Engineering, Multidisciplinary
Valentin Gallican, Miroslav Zecevic, Ricardo A. Lebensohn, Martin I. Idiart
Summary: Approximations for the elastic properties of dilute solid suspensions with imperfect interfacial bonding are derived and assessed. Two approximations are generated using a variational procedure, with one dependent on an arithmetic mean and the other dependent on a harmonic mean for averaging the interfacial compliance. The harmonic approximation is found to be more accurate than the arithmetic approximation, which has practical relevance given the widespread use of the latter in existing descriptions.
JOURNAL OF ELASTICITY
(2023)
Article
Materials Science, Multidisciplinary
Aritra Chakraborty, Ricardo A. Lebensohn, Laurent Capolungo
Summary: At moderate-to-high temperatures and below the yield strength, the inelastic deformation of metals is mainly controlled by vacancy diffusion-mediated processes. Vacancies (or atoms) can diffuse preferentially along grain boundaries or along dislocations, resulting in climb and self-climb. The proposed thermodynamically-consistent model considers the coupling between grain boundary and grain bulk diffusion-mediated plasticity mechanisms and predicts the strain rate dependencies and steady-state creep rate scaling with respect to grain size, temperature, and stress.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2023)
Article
Materials Science, Multidisciplinary
Yifan Zhang, Miroslav Zecevic, Aritra Chakraborty, Rodney J. McCabe, Thomas J. Nizolek, Ricardo A. Lebensohn, John S. Carpenter, Nan Li, Laurent Capolungo
Summary: This study investigates the dependence of kinking on microstructural attributes in NMLs through in situ micropillar compression, microstructure characterization, simulations, and modeling. The development of internal stresses during loading activates local layer-parallel glide triggering kinking in NMLs. The effect of key microstructural features on kink band formation in NMLs is also revealed.
Article
Engineering, Mechanical
Adnan Eghtesad, Qixiang Luo, Shun -Li Shang, Ricardo A. Lebensohn, Marko Knezevic, Zi-Kui Liu, Allison M. Beese
Summary: This study combines a full-field crystal plasticity model with a first principles-informed dislocation density hardening law and a machine learning approach to investigate the microstructural features correlated with micromechanical field localization in polycrystalline Ni. The results show that regions near grain boundaries, higher Schmid factors, low slip transmissions, and high intergranular misorientations are more prone to being micromechanical hotspots. The integration of physics-based crystal plasticity with machine learning provides insights into the initiation zones of micromechanical damage in polycrystalline metals.
INTERNATIONAL JOURNAL OF PLASTICITY
(2023)
Article
Chemistry, Physical
Dongil Shin, Ryan Alberdi, Ricardo A. Lebensohn, Remi Dingreville
Summary: Recent developments in micromechanics and neural networks have provided promising paths for accurately predicting the response of heterogeneous materials. The deep material network, with its multi-layer design and trained micromechanics building blocks, offers the ability to extrapolate material behavior to different constitutive laws without retraining. However, the random initialization of network parameters in current training methods leads to unavoidable errors. In this study, we propose a visualization technique using an analogous unit cell to initialize deeper networks and improve the accuracy and calibration performance, while also providing a more intuitive representation of the network for explainability.
NPJ COMPUTATIONAL MATERIALS
(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)
