Article
Materials Science, Multidisciplinary
Chenchen Yuan, Zhuwei Lv, Changmeng Pang, Xin Li, Rui Liu, Can Yang, Jiang Ma, Haibo Ke, Weihua Wang, Baolong Shen
Summary: This study investigated the plastic flow of metallic glass under ultrasonic vibration and found that ultrasonic vibration can improve the plastic deformation characteristics and enhance the activation energy for atomic diffusion. A more homogeneous plastic deformation was observed in the ultrasonic-vibrated sample, indicating improved mechanical properties.
SCIENCE CHINA-MATERIALS
(2021)
Article
Nanoscience & Nanotechnology
Silvia Pomes, Nozomu Adachi, Masato Wakeda, Takahito Ohmura
Summary: This study found a precursor phenomenon to incipient plasticity before the first serration in Zr50Cu40Al10 at% bulk metallic glass via nanoindentation testing.
SCRIPTA MATERIALIA
(2023)
Article
Nanoscience & Nanotechnology
J. H. Yu, L. Q. Shen, D. Sopu, B. A. Sun, W. H. Wang
Summary: The study provides an intuitive interpretation for the critical growth of an atomic-scale plastic flow unit in metallic glasses through an energy conversion approach. It is found that the growth of the atomic units is a competition process between intrinsic configurational entropy change and the constraint effect of the glassy matrix on the inelastic deformation of the plastic flow unit. At the yielding point, the activation of a plastic flow unit should take the easiest path in the potential energy landscape, with the intrinsic configurational entropy change and the elastic constraint effect contributing equally to the activation energy barrier.
SCRIPTA MATERIALIA
(2021)
Article
Materials Science, Multidisciplinary
J. Ding, A. Inoue, S. L. Zhu, S. L. Wu, E. Shalaan, A. A. Al-Ghamdi
Summary: This study investigated the effects of increased aluminum content on the glass-forming ability, microstructure, phase stability, mechanical properties, and deformation behaviors of Zr-rich Zr-Cu-Al alloys in bulk metallic glass composites (BMGCs). It was found that higher aluminum content improved the glass-forming ability of the alloys, leading to the fabrication of BMGCs with enhanced performance. The Zr-rich Zr-Cu-Al BMGCs exhibited a large fracture strain and high fracture strength under compression, with superior plastic deformation capabilities attributed to factors such as the formation of shear bands and interactions between crystals and shear bands.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2021)
Article
Chemistry, Physical
Chenchen Yuan, Rui Liu, Zhuwei Lv, Xin Li, Changmeng Pang, Can Yang, Jiang Ma, Weihua Wang
Summary: The mechanical behavior of Pd40Cu30P20Ni10 metallic glass after ultrasonic treatment was investigated using nanoindentation. Softening was observed, with a reduction of approximately 25% in hardness and 40% in elastic modulus. The Maxwell-Voigt model was used to characterize the structural evolution during ultrasonic-assisted plastic deformation. It was found that flow defects with shorter relaxation time activated under ultrasonic-frequency cycling loading, promoting fast atomic diffusion with a low energy barrier, leading to pronounced creep displacement and high moldability at ambient temperature. This study sheds light on the structural origin of plastic flow in metallic glasses under stress-assisted molding and may contribute to a deeper understanding of defect activation mechanisms in disordered systems.
Article
Nanoscience & Nanotechnology
Jiacheng Zhang, Mao Zhang, Xinyun Wang, Mo Li
Summary: Making composites with crystalline inclusions can improve plasticity in brittle metallic glasses. In this study, a new metallic glass matrix composite with a gradient network architecture was demonstrated. The unique microstructure of the composite leads to significant strain delocalization, delaying the generation of catastrophic shear bands. This is achieved by forming diffuse embryonic shear bands in the thin crystalline network interface and hindering/guiding their formation and movement in thick crystalline network regions.
SCRIPTA MATERIALIA
(2023)
Article
Materials Science, Multidisciplinary
Devashish Rajpoot, R. Lakshmi Narayan, Long Zhang, Punit Kumar, Haifeng Zhang, Parag Tandaiya, Upadrasta Ramamurty
Summary: Fracture behavior of bulk metallic glass matrix composites with both transforming and non-transforming fi-Ti dendrites under shear and opening modes was examined, showing lower fracture toughness in mode II due to shear dominant stress state and considerable crack growth in this mode. Despite the ability of transforming dendrites to strain harden and enhance ductility, BMGCs reinforced with non-transforming dendrites exhibit higher toughness in both modes. Shear band patterns suggest identical fracture mechanism in BMGCs and BMGs, with differences rationalized by the effect of relaxation enthalpy and dendrites length scale.
Article
Materials Science, Multidisciplinary
Ye Li, Hongyu Liang, Yinzhu She, Yulin Wang
Summary: Molecular dynamics simulations were used to study the amorphous structure and local rearrangement during tension deformation of AlSi alloys. It was found that the presence of Si element enhances the glass-forming ability of the alloy, and the amorphous structure breaks and transforms into complex structures during the tension deformation process.
MATERIALS TRANSACTIONS
(2021)
Article
Materials Science, Multidisciplinary
Galina Abrosimova, Valentina Chirkova, Elena Pershina, Nikita Volkov, Ilia Sholin, Aleksandr Aronin
Summary: The effect of free volume on the crystallization process of an Al87Ni8Gd5 amorphous alloy has been investigated. It was found that the deformation of the amorphous alloy leads to the formation of shear bands, which contain an enhanced concentration of free volume. To retain this free volume, a refractory metal was coated on the surface of the amorphous alloy. X-ray diffraction and transmission electron microscopy methods were used to study the structure of the Al87Ni8Gd5 alloy with a protective Ta coating. It was found that the fraction of nanocrystalline phase formed in the amorphous samples with the protective coating was larger than that in the uncoated samples. The size of Al nanocrystals formed in both coated and uncoated samples was the same. The higher rate of crystal nucleation in the deformed amorphous samples with a protective coating is attributed to a higher diffusion coefficient resulting from an enhanced concentration of free volume.
Article
Multidisciplinary Sciences
Weijian Zhang, Pingjun Tao, Yugan Chen, Junfeng Si, Zhenghua Huang, Kunsen Zhu, Yuanzheng Yang
Summary: Zr55.7Cu22.4Ni7.2Al14.7 alloy bars were prepared by copper mold suction casting. The specimens exhibited an amorphous structure. The crystallization incubation times decreased and the crystallization transformation rates increased with temperature rise. The crystallization nucleation rate showed a trend of first increasing and subsequently decreasing as the crystallization volume fraction increased, while the activation energy decreased monotonously. The crystallization behavior transformed from interface-controlled to diffusion-controlled growth.
SCIENTIFIC REPORTS
(2022)
Article
Chemistry, Physical
Y. S. Luo, J. J. Li, Z. Wang, M. Zhang, J. W. Qiao
Summary: Based on a simple mean-field model, two distinct types of slip avalanches in serrated plastic flows of bulk metallic glasses were identified to differentiate the slipping modes of shear bands under various strain rates. Small avalanches propagate progressively, while large avalanches follow a simultaneous propagation. By defining a weakening parameter and critical size, researchers were able to characterize the completely disparate shearing modes, with larger weakening and lower critical sizes indicating more activated shear transformation zones, offering a new method to explore plasticity in bulk metallic glasses.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Materials Science, Multidisciplinary
S. S. Hirmukhe, K. E. Prasad, I. Singh
Summary: Cellular metallic glasses exhibit attractive properties for structural and functional applications, with deformation mode transitioning from global failure to local failure and eventually to collective buckling as relative density decreases. Atomistic simulations show a shift in deformation behavior from localized to homogeneous with increasing cell size. The interaction stress associated with flow defects plays a key role in the deformation response of cellular metallic glasses.
MECHANICS OF MATERIALS
(2021)
Article
Chemistry, Physical
Guoning Ji, Jun Xiang, Jingsong Wei, Minghua Chen, Rongda Zhao, Xiaofeng Wu, Shunhua Chen, Fufa Wu
Summary: This study investigated the tensile plastic stability of Ti-based metallic glass composites (MGCs) with substrates of titanium alloys. The findings showed that the tensile plastic stability of MGC bimetals depended significantly on both the yield strength and geometrical dimension of the substrate. A high-strength Ti6Al4V (T64) alloy substrate greatly enhanced the ductility of the MGC, while combining the MGC with a low-strength pure titanium (PT) substrate led to worsened plastic stability. Increasing the thickness ratio of the PT substrate remarkably improved the plastic stability of the MGC. The enhancement of plasticity stability in the bimetals was explained and discussed from the perspective of normalized strain-hardening rate.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Physical
Guoning Ji, Jun Xiang, Jingsong Wei, Minghua Chen, Rongda Zhao, Xiaofeng Wu, Shunhua Chen, Fufa Wu
Summary: The tensile plastic stability of Ti-based metallic glass composites with substrates of titanium alloys is greatly influenced by the yield strength and geometrical dimension of the substrate. High-strength Ti6Al4V (T64) alloy substrate enhances the ductility of the MGC, while low-strength pure titanium (PT) substrate leads to worsened plastic stability. Increasing the thickness ratio of the PT substrate remarkably enhances the plastic stability of the MGC bimetals.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Multidisciplinary
Xiaoyu Wu, Xining Li, Xue Li, Shengli Li
Summary: Fe-based bulk metallic glasses with the addition of Sn showed improved plastic deformation ability due to the separation of Sn atoms from Si-, B- and P-centered clusters, which resulted in an increase in metal-metal bonds and filling of voids. The best plastic deformation ability was achieved with 0.3 at% Sn addition, increasing from 0.7% to 2.2%, with a yield strength of 3150 MPa.
METALS AND MATERIALS INTERNATIONAL
(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)