Article
Materials Science, Multidisciplinary
Jian Luo, Liping Huang, Yunfeng Shi, Binghui Deng
Summary: We conducted molecular dynamics simulations on metallic glasses to investigate the dynamics of shear band propagation. Our findings reveal that shear bands in metallic glasses exhibit supersonic propagation speed, microbranching, and velocity fluctuations, indicating intrinsic instability. The intersection of two shear bands under tension also leads to path deflection, speed slowing-down, and temperature rise at the junction region. These results suggest that shear bands in metallic glasses can be viewed as shear cracks in weakly nonlinear fracture mechanics theory.
Article
Nanoscience & Nanotechnology
H. Zhang, Z. Wang, H. J. Yang, X. H. Shi, P. K. Liaw, J. W. Qiao
Summary: Based on microscopic mechanisms, a constitutive equation for crack-like propagation velocity and a flow model for bulk metallic glasses (BMGs) are derived. The model explains the fundamental deformation of BMGs and accurately predicts the transition between serrated and non-serrated flows. The results are consistent with experimental data, providing a theoretical basis for plastically processing BMGs.
SCRIPTA MATERIALIA
(2023)
Article
Chemistry, Physical
Mohammad Taghi, Asadi Khanouki
Summary: This paper investigates the temperature rise in shear bands and its effect on crystallization behavior in bulk metallic glasses. The temperature profile inside and around shear bands is determined by the released elastic energy, shear band thickness, and energy transfer time. The size of the hot zone is found to be equal to the stable crack growth region, while the size of the liquid zone is equal to the vein pattern size on the fracture surface. Crystallization occurs around hot shear bands and inside cold shear bands, but only on the compressive side of the specimen. These findings provide valuable insights into the deformation behavior of bulk metallic glasses using an analytical approach.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Nanoscience & Nanotechnology
Yonghui Mo, Xiaochang Tang, Lingyi Meng, Junwei Qiao, Xiaohu Yao
Summary: Shear band behavior is crucial in toughening and failure of bulk metallic glasses (BMGs). This study investigates the spatial-temporal evolutions of shear bands in BMGs using DIC and ITI technologies. The experimental results are in agreement with the simulation results in some respects, providing insights for prediction of primary shear band, prevention of failure, and toughening method in BMGs.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Nanoscience & Nanotechnology
Yonghui Mo, Lingyi Meng, Xiaohu Yao
Summary: Shear banding behavior is significant in the deformation and failure mechanisms of metallic glasses. This study reveals the spatial-temporal evolutions of shear bands and their correlation with principal shear stress using digital image correlation technologies.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Chemistry, Physical
Xiaojun Sun, Jie He, Dunbo Yu, Yang Luo, Zilong Wang, Yuanfei Yang
Summary: This work investigates the relationship between structural heterogeneity and serrated flow in nanoscale phase separated Zr-Cu-Fe-Al bulk metallic glasses with different plasticity. The results show that as the atomic ratio of Cu to Fe increases, serration dynamics transform from a chaotic state to a self-organized critical state. This transformation is attributed to the increase in structural heterogeneity, which promotes the formation of multiple shear bands.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
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
Nanoscience & Nanotechnology
Limin Lai, Tianhao Liu, Xinghong Cai, Min Wang, Shengbiao Zhang, Wen Chen, Shengfeng Guo
Summary: The study introduces a series of low-cost refractory Mo-Co-B BMGs with enhanced GFA and high thermal stability, exhibiting exceptional hardness and Young's modulus.
SCRIPTA MATERIALIA
(2021)
Article
Chemistry, Physical
J. X. Zhao, R. Liu, D. Mao, J. He
Summary: This study investigated the effects of notch tip distance and stress triaxiality on the mechanical properties of cellular metallic glasses. The results showed that these two factors play key roles in controlling the yield strength and plasticity of notched samples.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Ceramics
J. X. Zhao, W. H. Chen, J. He, Z. G. Sun
Summary: Systematic experiments, simulations, and microscopic characterizations were conducted on double edge notched samples to study the transition from brittle instability to steady plasticity. The effects of ligament length, geometrical notch parameters, and thickness were investigated. It was found that the ligament length provides the space for shear band intersection, and wider ligaments lead to more predominant V-shaped double shear bands and higher plasticity. Thickness, on the other hand, has less influence on global plasticity. Shear banding process was simulated using a hydrostatic stress embedded free volume model, allowing for a better understanding of shear band evolution patterns.
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2023)
Article
Materials Science, Multidisciplinary
Xiangkui Liu, Jian Kong, Xinxiang Song, Shuai Feng, Qipeng Wang, Yang Yang, Tianchi Wang
Summary: The size dependence of ductile to brittle transition in Zr-based metallic glasses was investigated through small punch test, revealing a significant difference in behavior between thin and thick samples. Two critical deformation factors, alpha(c1) and alpha(c2), were identified at sample thicknesses of 200 and 500 mm, triggering the initiation of circumferential and radial shear bands respectively. The interaction of multiple shear bands significantly enhances the ductility of samples with alpha >= alpha(c1).
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2021)
Article
Chemistry, Physical
Guoxiang Shen, Weizhi Li, Zhichao Ma, Shengteng Zhao, Dongni Liu, Hongwei Zhao, Luquan Ren
Summary: This study investigates the depth-dependent mechanical properties of Zr-based bulk metallic glasses using the depth-sensitive nanoindentation technique. The results show that the surface hardness and elastic modulus increase, while fracture toughness decreases with decreasing indentation depth. This mechanical size effect is closely related to the evolution of shear bands at different depths.
Article
Metallurgy & Metallurgical Engineering
Qu Ruitao, Wang Xiaodi, Wu Shaojie, Zhang Zhefeng
Summary: This paper reviews the research on shear banding behaviors in metallic glasses and their mechanisms under different loading conditions, including shear band propagation, cracking, and unstable fracture. Additionally, the effects of sample size, external confinement, and testing temperature on shear banding behavior, as well as the splitting and fatigue crack mechanisms in brittle metallic glasses, are discussed.
ACTA METALLURGICA SINICA
(2021)
Article
Chemistry, Physical
Ziyun Long, Pingjun Tao, Guotai Wang, Kunsen Zhu, Yugan Chen, Weijian Zhang, Zhihao Zhao, Yuanzheng Yang, Zhenghua Huang
Summary: This study reports that microalloying can improve the plasticity of bulk metallic glasses (BMGs) at room temperature. The selection of minor elements Nb and Ta has a positive heat of mixing with the based compositions. The self-organize to a critical state (SOC) occurs in all BMGs, with a constant scaling exponent beta value. The variation of the rotation angle of primary shear bands (SBs) is consistent with plasticity. Meanwhile, the yield strength is linearly dependent on the local fracture toughness of BMGs.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Nanoscience & Nanotechnology
C. Liu, Y. Ikeda, R. Maass
Summary: This study provides strong evidence for the accumulation of structural damage in Zr-based bulk metallic glass as a result of shear strain admitted by shear bands. Analysis of shear-band structure with high-angle annular dark field transmission electron microscopy reveals scattered data with an overall trend of increasing local volume dilatation with increasing shear strain. However, locally, a variety of trends are observed, highlighting the strong heterogeneity of structural damage in shear bands in metallic glasses.
SCRIPTA MATERIALIA
(2021)
Article
Nanoscience & Nanotechnology
B. Huang, X. C. Tang, C. Geng, Q. F. He, J. Yi, Q. Wang, W. X. Huang, Q. X. Yuan, Y. Yang, G. Wang, W. H. Wang
Summary: Using synchrotron X-ray nano-computed tomography and finite element analysis, we reconstructed the nanostructure of shear bands (SBs) and investigated their formation and evolution in a bent heterogeneous Pd-based metallic glass fiber. We found that in addition to plain SBs (PSBs), there were hidden SBs (HSBs) with density fluctuations inside the metallic glass. The HSBs had average densities 5%-25% smaller than the surrounding matrix and thicknesses ranging from 100 nm to 530 nm. The structures of the HSBs were closely related to the heterogeneous structure and local strain rate of the metallic glass.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Engineering, Multidisciplinary
LangTing Zhang, YaJuan Duan, YunJiang Wang, Yong Yang, JiChao Qiao
Summary: In this paper, it is demonstrated that cooling a BMG from the supercooled liquid region at laboratory rates can reverse the relaxation enthalpy lost during the preceding structural relaxation. Increasing the cooling rate enhances atomic mobility and dynamic mechanical relaxation intensity. This rejuvenation methodology facilitates tailoring the mechanical properties of BMGs and provides a comprehensive understanding of the rejuvenation mechanism.
SCIENCE CHINA-TECHNOLOGICAL SCIENCES
(2023)
Article
Materials Science, Multidisciplinary
Meng Du, Bin Liu, Yong Liu, Yong Yang
Summary: Additively manufactured face-centered-cubic high entropy alloys show high strength and good ductility, making them promising materials for impact-resistant structures. In this study, FeCoCrNi high entropy alloy was produced using laser beam powder bed fusion, and dynamic tests were conducted. The alloy exhibited superior yield stress and toughness at high strain rates, which can be attributed to its dislocation cell structure and the formation of microbands and deformation twins.
Correction
Materials Science, Multidisciplinary
Yu-Tian Wang, Quan-Feng He, Zi-Jian Wang, Ming-Xing Li, Yan-Hui Liu, Yong Yang, Bao-An Sun, Wei-Hua Wang
SCIENCE CHINA-MATERIALS
(2023)
Article
Chemistry, Physical
Ziqing Zhou, Yinghui Shang, Xiaodi Liu, Yong Yang
Summary: Researchers have developed a generative deep learning framework to directly generate compositionally complex bulk metallic glasses (BMGs), such as high entropy BMGs. The framework is capable of producing composition-property mappings, which paves the way for the inverse design of BMGs.
NPJ COMPUTATIONAL MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Xinxue Tang, Yuk-Tong Cheng, Junda Shen, Jia-Hua Liu, Zhibo Zhang, Zhiqin Deng, Fucong Lyu, Yong Yang, Guangyu Zhu, Zhengtao Xu, Jian Lu, Yang Yang Li
Summary: This article introduces a novel, safe, and generic method for etching, gelatinating, and processing solid ceramics. It involves using multiple ionic solutions to convert calcite into a multi-ionic amorphous gel with moderate flowability, allowing for convenient collection, storage, transfer, and molding.
ADVANCED ENGINEERING MATERIALS
(2023)
Article
Engineering, Mechanical
F. Zhu, G. H. Xing, G. J. Lyu, L. T. Zhang, Yun-Jiang Wang, Y. Yang, J. M. Pelletier, J. C. Qiao
Summary: Dynamic mechanical relaxation is an important metric for studying viscoelastic amorphous solids. The relaxation behavior of amorphous solids, due to their heterogeneous microstructure, often deviates from the Debye relaxation. The distribution of relaxation time based on the stretched exponential function or power law is commonly used to describe non-Debye relaxation, but its applicability to real amorphous materials is still under discussion.
INTERNATIONAL JOURNAL OF PLASTICITY
(2023)
Article
Physics, Applied
H. Wang, Q. F. He, A. D. Wang, Y. Yang
Summary: We fabricated severely distorted high-entropy Elinvar alloys through micro-alloying of (CoNi)(50-x)(TiZrHf)(50)Fe-x (in atomic percentage). Our experiments demonstrate a tunable Elinvar effect that is positively correlated with overall lattice distortion in single-phase B2 high entropy alloys. Additionally, we propose a simple physical model that captures the general trend of our experimental findings.
JOURNAL OF APPLIED PHYSICS
(2023)
Article
Chemistry, Multidisciplinary
Minhyuk Park, Qing Yu, Qing Wang, Chaojie Chen, Zhibo Zhang, Ziyin Yang, Huan Chen, Qiaoshi Zeng, Yunlong Zi, Jun Fan, Yong Yang
Summary: In this work, a series of large-sized 2D titanium nanomaterials with a unique heterogeneous nanostructure containing nanosized titanium, titanium oxide, and MXene-like phases were fabricated using the method of polymer surface buckling enabled exfoliation (PSBEE). These 2D titaniums exhibit both superb mechanical strength (6-13 GPa) and remarkable ductility (25-35%) at room temperature, surpassing all other titanium-based materials reported so far. Furthermore, the 2D titanium nanomaterials also showed good performance in triboelectric sensing and can be used to fabricate self-powered, on-skin conformal triboelectric sensors with good mechanical reliability.
Article
Multidisciplinary Sciences
Xin Xia, Ziqing Zhou, Yinghui Shang, Yong Yang, Yunlong Zi
Summary: This study demonstrates the use of metallic glass as a triboelectric interface to enhance the efficiency of charge generation in triboelectric nanogenerators. Metallic glass exhibits lower friction coefficient and better wear resistance compared to copper, resulting in improved output performance. The metallic glass-based triboelectric nanogenerators also show excellent humidity resistance and can approach the theoretical limit of charge generation, surpassing copper-based TENGs by 35.2%.
NATURE COMMUNICATIONS
(2023)
Article
Materials Science, Multidisciplinary
Xinghao Wei, Lixin Sun, Zhongwu Zhang, Yang Zhang, Junhua Luan, Zengbao Jiao, Chain Tsuan Liu, Gang Zhao
Summary: In this study, the effects of aging treatments at 500 and 550 degrees C on the impact performance of a Cu precipitation-strengthened steel at a low temperature of -80 degrees C were investigated. The main factor controlling the low-temperature toughness was found to be solute segregation at lath boundaries. Excellent impact performance of -180 J at -80 degrees C, along with high yield strength of -1050 MPa and total elongation of 19%, can be achieved by controlling the segregation of solute elements, specifically Mo and Mn, at the lath boundaries. The evolution of matrix and precipitates during aging treatments and the strengthening and toughening mechanisms were also discussed.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Review
Chemistry, Multidisciplinary
Hang Wang, Quanfeng He, Xiang Gao, Yinghui Shang, Wenqing Zhu, Weijiang Zhao, Zhaoqi Chen, Hao Gong, Yong Yang
Summary: Since 2004, the design of high entropy alloys (HEAs) has sparked significant interest in the materials science community due to their exceptional structural and functional properties. By incorporating multiple principal elements into a common lattice, a highly distorted lattice can be created, enabling HEAs to offer a promising combination of mechanical and physical properties that are not typically observed in conventional alloys. This article provides an extensive overview of multifunctional HEAs with severe lattice distortion, including theoretical models, experimental and computational methods, and the impact of lattice distortion on their mechanical, physical, and electrochemical properties. The review aims to stimulate further research into the study of distorted lattices in crystalline solids.
ADVANCED MATERIALS
(2023)
Letter
Materials Science, Multidisciplinary
Bo Xiao, Jixun Zhang, Shaofei Liu, Yilu Zhao, Lianyong Xu, C. T. Liu, Tao Yang
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2023)
Article
Physics, Multidisciplinary
Langting Zhang, Yunjiang Wang, Yong Yang, Jichao Qiao
Summary: Mechanical cycling is an effective method to improve the mechanical properties of metallic glasses. This study investigates the anelastic origin of rejuvenation by mechanical cycling in La30Ce30Ni10Al20Co10 metallic glass using DSC and DMA. The results show that mechanical cycling activates flow defects, leading to anelastic strains and energy storage, which can be observed as larger relaxation enthalpy on DSC curves. However, the excess relaxation enthalpy caused by anelastic strain is released over time, suppressing atomic mobility and increasing β relaxation activation energies. The strategy of mechanical cycling at small strains expands the energy states of metallic glasses.
SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY
(2023)
Article
Materials Science, Multidisciplinary
Qi Hao, Eloi Pineda, Yun-Jiang Wang, Yong Yang, Ji-Chao Qiao
Summary: The stress relaxation dynamics of La60Ni15Al25 metallic glass in ribbon and bulk samples were studied. It was observed that the stress decay of deep glass is mediated by beta relaxation, which contributes about 5% to the total stress. The characteristic time of stress relaxation near the glass transition coincides with that of alpha relaxation, suggesting a direct relationship between the two relaxation processes. A possible atomic mechanism involving both relaxation and deformation is proposed based on the evolution of shear transition zone. The findings provide a strategy to detect beta relaxation associated phenomena and clarify the roles of relaxation modes in the nonelastic deformation of amorphous matters.
