Article
Chemistry, Physical
Changshan Zhou, Hezhi Zhang, Xudong Yuan, Kaikai Song, Dan Liu
Summary: This study validates the applicability of pre-plastic deformation (PPD) on bulk metallic glasses (BMGs) with different Poisson's ratios. It is found that PPD treatment can effectively produce multiple shear bands in BMGs with high Poisson's ratios, leading to improved strength and plasticity. However, for BMGs with low Poisson's ratios, PPD treatment results in only a few shear bands and micro-cracks, leading to worsening mechanical properties. Furthermore, among the PPD-treated BMGs with similar high Poisson's ratios, Zr56Co28Al16 BMG exhibits larger plasticity due to the presence of more defective icosahedral clusters, which serve as nucleation sites for shear transformation zones (STZs) during deformation.
Article
Engineering, Mechanical
K. Tao, V. A. Khonik, J. C. Qiao
Summary: In this study, the effects of the structural energy states of Zr50Cu40Al10 metallic glass on its performance were investigated using depth-sensing nanoindentation. The shear transformation zone volume of the relaxed metallic glass is larger than that of as-cast one, while the strain rates sensitivity displays the opposite tendency. The plastic deformation in the creep stage of nanoindentation originates from the delayed plasticity inherited from the loading process. The creep depth shows strain rates and microstructural states dependence.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(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
Chemistry, Physical
Monika Antoni, Florian Spieckermann, Niklas Plutta, Christoph Gammer, Marlene Kapp, Parthiban Ramasamy, Christian Polak, Reinhard Pippan, Michael J. J. Zehetbauer, Juergen Eckert
Summary: The effects of severe plastic deformation (SPD) by means of high-pressure torsion (HPT) on Fe73.9Cu1Nb3Si15.5B6.6 and Fe81.2Co4Si0.5B9.5P4Cu0.8 iron-based metallic glasses were compared. HPT processing extended the consolidation and deformation ranges for Fe73.9Cu1Nb3Si15.5B6.6, and achieved consolidation and deformation with minimum cracks for Fe81.2Co4Si0.5B9.5P4Cu0.8 for the first time. Various analyses revealed that Fe81.2Co4Si0.5B9.5P4Cu0.8 exhibited HPT-induced crystallization phenomena, while Fe73.9Cu1Nb3Si15.5B6.6 did not crystallize even at high HPT-deformation degrees.
Article
Physics, Multidisciplinary
Hui Wang, Wojciech Dmowski, Yang Tong, Zengquan Wang, Yoshihiko Yokoyama, Jittisa Ketkaew, Jan Schroers, Takeshi Egami
Summary: This study suggests that the plasticity of metallic glasses is related to the local atomic rearrangements under stress, rather than their atomic structure directly. By conducting experiments on various bulk metallic glasses, researchers found that the extent of local deviation from affine deformation within the elastic regime is strongly correlated with the plastic behavior of metallic glasses beyond yield.
PHYSICAL REVIEW LETTERS
(2022)
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
D. X. Han, G. Wang, Q. Wang, R. Feng, X. D. Ma, K. C. Chan, C. T. Liu
Summary: Shear-banding behavior in metallic glasses, which is associated with yield strength, is influenced by many factors at a micro-scale. In this study, a plastic-strength model was developed considering machine compliance, micro-pillar geometry imperfection, and substrate sink-in. The model was supported by the compressive properties of 18 metallic glasses and provides guidance for elastic limits and shear-banding dynamics at the micro-scale in characterizing deformation behavior of amorphous materials.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2023)
Article
Materials Science, Multidisciplinary
Zhen-Ya Zhou, Yang Sun, Liang Gao, Yun-Jiang Wang, Hai-Bin Yu
Summary: In this study, molecular dynamics simulations and metadynamics are used to investigate the atomic rearrangement mechanism in glass materials. It is shown that there is a correlation between string-like cooperative motions and plastic deformation in amorphous materials.
Article
Physics, Applied
Y. S. Luo, Z. Wang, J. Eckert, J. W. Qiao
Summary: This study establishes a theory bridging the free-volume and shear-transformation zone concepts to predict the failure threshold of bulk metallic glasses (BMGs) and investigates the physical mechanism of slip. The room-temperature theoretical failure threshold follows a material-dependent criterion similar to the glass-transition temperature, providing a quantitative understanding of failure mechanisms highly dependent on serrations in BMGs. The linear relation between the increment of free-volume and strain rate at small time intervals describes inhomogeneous flow.
JOURNAL OF APPLIED PHYSICS
(2021)
Article
Materials Science, Multidisciplinary
Rong-Hao Shi
Summary: This study introduces the Coarse Grained Equivalent Stiffness (CGES) method to characterize the heterogeneities of metallic glasses (MGs) based on the determinant of local Hessian matrix (LHM), revealing the physical mechanism of local shear, shear-induced dilatancy, and dilation. Molecular simulations also predict the spatial distribution of atoms experiencing shear or volumetric deformation before yielding.
MATERIALS TODAY COMMUNICATIONS
(2023)
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
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
Materials Science, Multidisciplinary
Kamran Karimi, Mikko J. Alava, Stefanos Papanikolaou
Summary: We investigated the behavior of the local, microstructural elastic modulus across the plastic yielding transition in six Ni-based multicomponent glasses. Elastic modulus fluctuations displayed consistent percolation characteristics, indicating universal behavior across chemical compositions and overall yielding sharpness characteristics. Elastic heterogeneity grew upon shearing via the percolation of elastically soft clusters within an otherwise rigid amorphous matrix, confirming prior investigations in granular media and colloidal glasses. We observed clear signatures of percolation transition with spanning clusters that were universally characterized by scale-free characteristics and critical scaling exponents.
PHYSICAL REVIEW MATERIALS
(2023)
Article
Engineering, Mechanical
Wanfu Dong, Jianping Lai, Jiaxin Yu, Udo D. Schwarz, Yifan Zhang, Kun Zhu, Amit Datye
Summary: Understanding the structure-property relationship is essential for designing metallic glasses with advanced properties. In this study, nanoscratching experiments were conducted to establish a correlation between the structure and nano-tribological behavior of Zr-based metallic glasses. The results showed that the scratching depth and residual depth of the scratch track increased with an increase in the material's fictive temperature. Additionally, the effect of the fictive temperature on the friction coefficient varied with the applied load, with adhesion-induced friction dominating at low loads and plowing dominating at high loads. The study also revealed the occurrence of scratch-induced yielding and suggested the possibility of using ramping load scratching to characterize the ductile-to-brittle transition of metallic glasses as an alternative to time-consuming fracture tests.
Article
Chemistry, Physical
Xiaoqian Lu, Shidong Feng, Lin Li, Li-Min Wang, Riping Liu
Summary: This study tackles the challenge of identifying defects in metallic glasses by using atomic vibrational entropy from a thermodynamic perspective. The study reveals the critical role of vibrational entropy in bridging dynamics, thermodynamics, and structure in metallic glasses. The local vibrational entropy obtained by coarse-graining the atomic vibrational entropy in space effectively distinguishes between liquid-like and solid-like atoms and establishes a correlation with the structure of metallic glasses, offering a route to predict plastic events.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Article
Nanoscience & Nanotechnology
Chong Yang, Cheng Zhang, Zheng-Jie Chen, Yu Li, Wen-Yuan Yan, Hai-Bin Yu, Lin Liu
Summary: The study introduces a novel strategy to design efficient and reusable catalysts by incorporating Cu into a metallic glass-based catalyst and constructing three-dimensional hierarchical porous structures through laser 3D printing. The resulting catalysts show outstanding catalytic efficiency and exceptional reusability in degrading dyes.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Chemistry, Physical
Hao Zhang, Xinyi Wang, Hai-Bin Yu, Jack F. Douglas
Summary: The study investigates the fast beta- and Johari-Goldstein relaxation processes, along with the elastic scattering response of glass-forming liquids and the boson peak. These processes are found to be universal, even in glass-forming liquids with a fragile-strong transition. Heating leads to the growth of stringlets, resulting in an increase in relaxation process intensity and excitation softening.
JOURNAL OF CHEMICAL PHYSICS
(2021)
Article
Nanoscience & Nanotechnology
Qian Zhang, Yimin Chen, Wenhao Leng, Jierong Gu, Yuanen Mao, Xiang Shen, Rongping Wang, Tiefeng Xu, Jun-Qiang Wang, Guoxiang Wang
Summary: Recent research has shown that two-dimensional confined GeTe PCLs exhibit a distinct fragile-to-strong crossover behavior, with a crossover magnitude of 2. This confirms that two-dimensional confinement can induce FSC in PCLs, highlighting their fast crystallization and good thermal stability.
SCRIPTA MATERIALIA
(2021)
Article
Physics, Applied
Chenfei Wang, Guanjun Yao, Juncheng Liu, Yuanen Mao, Wenhao Leng, Yimin Chen, Xiang Shen, Jun-Qiang Wang, Rongping Wang
Summary: The study shows that a small amount of calcium doping can significantly enhance the thermal stability of GeTe films without significantly affecting the maximum crystal growth rate. In addition, no calcium-related crystalline phases or chemical bonds were found in the doped GeTe, indicating that the calcium atoms are in a free state within the GeTe matrix.
APPLIED PHYSICS LETTERS
(2021)
Article
Chemistry, Multidisciplinary
Qun Yang, Chao-Qun Pei, Hai-Bin Yu, Tao Feng
Summary: Nanoglasses exhibit promoted beta-relaxation and enhanced microscale tensile plasticity compared to rapidly melt-quenched metallic glasses. The beta-relaxation is sensitive to the interfacial regions among grains in nanoglasses, showing a clear correlation between amorphous nanostructures and the beta-relaxation.
Article
Materials Science, Multidisciplinary
J. Q. Feng, Y. H. Liu, J. H. Sui, A. N. He, W. X. Xia, W. H. Wang, J. Q. Wang, J. T. Huo
Summary: This study developed amorphous/nanocrystalline composite fibers with a huge refrigerant capacity, which can be used for magnetic refrigeration across a wide temperature range, providing a new approach to the research of refrigeration magnetic materials.
MATERIALS TODAY PHYSICS
(2021)
Article
Physics, Applied
Wenhao Leng, Yimin Chen, Qian Zhang, Lei Sun, Xiang Shen, Rongping Wang, Guoxiang Wang, Jun-Qiang Wang, Tiefeng Xu
Summary: The study presents a thermally stable monatomic antimony (Sb) with enhanced amorphous thermal stability and high crystallization activation energy, making it a promising candidate for on-chip memory applications.
APPLIED PHYSICS LETTERS
(2021)
Article
Nanoscience & Nanotechnology
Liang Cai, Juntao Huo, Peng Zou, Guowei Li, Jian Liu, Wei Xu, Meng Gao, Shuzhi Zhang, Jun-Qiang Wang
Summary: Research has shown that alternating magnetic fields (AMFs) are a promising strategy to promote electrochemical catalytic reactions. In this study, the influence of AMFs on the hydrogen evolution reaction (HER) was systematically investigated using a Fe-Co-Ni-P-B magnetic catalyst. The results showed that AMFs significantly increased the catalytic efficiency of HER, attributed to the enhancement of charge-transfer efficiency through Lorentz interaction.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Chemistry, Physical
Xuanzhi Liu, Peng Zou, Lijian Song, Bowen Zang, Bingnan Yao, Wei Xu, Fushan Li, Jan Schroers, Juntao Huo, Jun-Qiang Wang
Summary: This paper proposes a scalable high-throughput bubble screening method to identify multicomponent alloy catalysts with the highest catalytic properties. The study successfully identifies the optimum compositions with advanced intrinsic catalytic activities in Ni-Co-Ti and Ni-Fe-Au alloys.
Article
Physics, Applied
Yimin Chen, Nan Han, Fanshuo Kong, Jun-Qiang Wang, Chenjie Gu, Yixiao Gao, Guoxiang Wang, Xiang Shen
Summary: In this study, the crystallization kinetics of 7 nm thick GST films in a multilayer structure was investigated using ultrafast differential scanning calorimetry and a generalized viscosity model. A fragile-to-strong crossover transition behavior was found in the 2D confined GST ultrathin film, which is beneficial for applications in neuro-inspired in-memory computing in low-dimensional phase-change devices.
APPLIED PHYSICS LETTERS
(2022)
Article
Chemistry, Multidisciplinary
Kexin Peng, Yimin Chen, Yingjie Meng, Jun-Qiang Wang, Chenjie Gu, Yixiao Gao, Guoxiang Wang, Xiang Shen
Summary: Gas doping has shown to enhance thermal stability for phase-change materials, but in this study, the negative effects of different oxygen-doping concentrations on the crystallization kinetics of Sb-GeO2 (SGO) films were investigated. It was found that introducing additional oxygen weakened the fragile-to-strong crossover (FSC) behavior, and increased thermal stability but decreased crystal growth rate significantly for the SGO film.
CRYSTAL GROWTH & DESIGN
(2022)
Article
Chemistry, Physical
Si-Xu Peng, Zheng Yin, Tao Zhang, Qun Yang, Hai-Bin Yu, Ming-Hua Zeng
Summary: This paper presents a new method for glass formation, utilizing mechanical vibration to facilitate the melting of metal-organic frameworks at lower temperatures and produce glass with unique properties. Experimental results show that the vibrated glass material exhibits a lower glass transition temperature, improved gas accessible porosity, and pronounced short-to-medium range structures compared to conventionally melt-quenched glass.
JOURNAL OF CHEMICAL PHYSICS
(2022)
Article
Nanoscience & Nanotechnology
Peng Zou, Bowen Zang, Lijian Song, Wei Xu, Juntao Huo, Jun-Qiang Wang
Summary: An effective method based on hybridization strategy and de-alloying nanoporosity is reported for increasing the electrocatalytic activity of metallic glasses (MGs) in hydrogen evolution reaction (HER). The study found that the electrochemical performance reaches the maximum at 3% Au addition, displaying superior catalytic performance.
ACS APPLIED NANO MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Liang Gao, Yang Sun, Hai-Bin Yu
Summary: The Johari-Goldstein secondary (0) relaxations are intrinsic features of supercooled liquids and glasses, and play a crucial role in several properties of glassy materials. This study demonstrates through atomistic simulations and percolation analysis that the mobile clusters are percolated at the occurrence of 0 relaxation in seven different glassy systems. The percolation transition shows the same temperature and time dependence with 0 relaxation, and emerges universally when about 10% of the atoms are mobile, with a dimension of approximately 2 for the system-spanning cluster. These findings contribute to the understanding of 0 relaxation in glasses.
Article
Materials Science, Multidisciplinary
Tao Zhang, Hui-Feng Zhao, Ke-Yan Wang, Zhen-Jie Chen, Li Li, Jing Peng, Xu Peng, Yong-Jiang Huang, Hai-Bin Yu
Summary: Even in their bulk forms, complex alloys like high-entropy alloys (HEAs) can be used as electrocatalysts for the oxygen evolution reaction (OER). The performance of HEAs is influenced by three crucial factors: homogeneous solid solution phase, surface reconstruction, and diversity of active intermediate species. These factors contribute to the potential industrial applications of bulk HEAs.
