Article
Materials Science, Multidisciplinary
Tianding Xu, Xiao-Dong Wang, Eric M. Dufresne, Yang Ren, Qingping Cao, Dongxian Zhang, Jian-Zhong Jiang
Summary: The shape memory effect (SME) is found in annealed metallic glasses (MGs), where atoms can return to low-energy configurations through heating, extending the potential applications of MGs as functional materials.
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
Nannan Ren, Lina Hu, Bing Wang, Kaikai Song, Pengfei Guan
Summary: This study investigates the evolution of hidden structural topological features associated with the non-Arrhenius crossover in metallic glass-forming liquids through molecular dynamics simulations and topological order analysis. It reveals that the cooperative motions of atoms with k > 3 developing a stable topological network contribute to the non-Arrhenius behavior below the crossover temperature T-A, shedding light on the structural origin of relaxation dynamics in metallic glass-forming liquids.
SCRIPTA MATERIALIA
(2021)
Article
Materials Science, Multidisciplinary
J. Q. Wu, H. P. Zhang, M. Z. Li
Summary: The relationship between structure and relaxation dynamics in metallic glass-forming liquids was studied through classical molecular dynamics simulations. It was found that the Debye-Waller factor decreases with increasing five-fold local symmetry and a new equation describing this relationship was derived. These findings suggest a common structural basis for both short-time beta-relaxation and long-time alpha-relaxation dynamics.
COMPUTATIONAL MATERIALS SCIENCE
(2022)
Article
Chemistry, Physical
Changjiu Chen, Zheng Yang, Bangjie Yin, Akihisa Inoue, Jinyong Zhang, Weiming Yang, Ze Sun, Qiaowen Luo, Zheng Chen, Yezeng He, Baolong Shen
Summary: The relaxation behavior and thermal stability of GdxNi20Al80-x (x = 50, 60, 65, 70 at%) metallic glasses were studied. The Gd70Ni20Al10 alloy exhibited the most significant relaxation phenomenon.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Physical
Ming Yang, Wenyue Li, Xiongjun Liu, Hui Wang, Yuan Wu, Xianzhen Wang, Fei Zhang, Qiaoshi Zeng, Dong Ma, Haihui Ruan, Zhaoping Lu
Summary: This study demonstrates the significance of configurational entropy (S-conf) in the glass transition process through experimental and simulation results. A higher S-conf leads to a more stable and ordered glass structure.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2022)
Review
Materials Science, Multidisciplinary
Baran Sarac, Juergen Eckert
Summary: This review provides an overview of the potential of bulk metallic glasses (BMGs) as net-shaping materials, their thermal processing capability, micro-/nano-structure, deformation behavior, and flow kinetics. It also discusses the variation of properties in the supercooled liquid region, high temperature deformation modeling, and applications of thermally-formed BMGs in various fields.
PROGRESS IN MATERIALS SCIENCE
(2022)
Article
Chemistry, Physical
N. N. Ren, P. F. Guan, K. L. Ngai
Summary: This study investigated the superposition of frequency dispersion of structural alpha relaxation at different temperature and pressure combinations, as well as the time dependence of faster processes like caged molecule dynamics and JG beta relaxation. Through molecular dynamics simulations, it was confirmed that this property holds for not only alpha relaxation but also caged dynamics and JG beta relaxation.
JOURNAL OF CHEMICAL PHYSICS
(2021)
Article
Chemistry, Physical
M. N. Liu, Q. Hao, J. Dong, B. A. Sun, S. D. Feng, D. Crespo, J. C. Qiao
Summary: It was found that the beta relaxation becomes more pronounced with the increase of copper in binary metallic glasses. However, the beta relaxation of CuZr or CuTi binary metallic glasses is much more modest compared to other metallic glasses.
Article
Multidisciplinary Sciences
Valerio Di Lisio, Isabella Gallino, Sascha Sebastian Riegler, Maximilian Frey, Nico Neuber, Golden Kumar, Jan Schroers, Ralf Busch, Daniele Cangialosi
Summary: The glass transition temperature of metallic glasses can be depressed by up to 40 K by reducing the sample size to below 10 & mu;m, allowing the attainment of glasses with low energy states. The properties of bulk metallic glasses are profoundly affected by reducing the sample size. By systematically reducing the length scale of gold and platinum-based metallic glasses, the vitrification behavior and atomic mobility were studied, revealing size-dependent vitrification kinetics in micrometer-sized glasses.
NATURE COMMUNICATIONS
(2023)
Article
Materials Science, Multidisciplinary
Yimeng Zhao, Xuan Li, Xiaobin Liu, Jiazi Bi, Yang Wu, Ruijuan Xiao, Ran Li, Tao Zhang
Summary: The development of Co-Ta-B-Si bulk metallic glasses with high glass-transition temperature, large compressive plasticity, high strength, and high glass-forming ability was achieved by accurately tuning the metalloid element contents of Si and B in the parental alloy. The improvement in plastic deformation was attributed to the self-organization behaviors of high-density shear bands.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2021)
Article
Materials Science, Multidisciplinary
Y. H. Meng, S. Y. Zhang, W. H. Zhou, J. H. Yao, S. N. Liu, S. Lan, Y. Li
Summary: Structural relaxation and subsequent rejuvenation through thermal treatment can improve the plasticity and fracture toughness of metallic glasses. The recovery of loosely packed regions in the atomic structure during annealing contributes to the observed rejuvenation. Tailoring the mechanical properties of metallic glasses can be achieved by controlling the annealing and thermal treatment conditions.
Article
Materials Science, Multidisciplinary
L. T. Zhang, Yun-Jiang Wang, Y. Yang, J. C. Qiao
Summary: In this study, the rejuvenation of metallic glasses through the training of the beta relaxation process is demonstrated. The transition from structural relaxation to rejuvenation is observed with increasing training frequency. Surprisingly, rejuvenation can be achieved at a relatively small cyclic strain of 0.2%. Rejuvenation increases relaxation enthalpy and promotes decoupling of the beta relaxation process and relaxation process. A cluster of beta relaxation time curves is formulated to describe energetic states between ultrastable and ultimately rejuvenated metallic glasses. Additionally, rejuvenation expands the distribution of the beta relaxation process, anelastic, and viscoplastic components during deformation.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2023)
Article
Materials Science, Ceramics
M. N. Liu, Q. Hao, J. C. Qiao
Summary: The dynamic mechanical relaxation behavior of two different bulk metallic glasses was examined, showing distinct characteristics in the relaxation process, where physical aging resulted in a decrease in beta relaxation intensity and an increase in relaxation time. This behavior was found to be linearly correlated, similar to that observed in organic glasses, suggesting a potential common mechanism underlying relaxation processes in different types of glasses.
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2021)
Article
Materials Science, Multidisciplinary
Y. Tang, H. F. Zhou, X. D. Wang, Q. P. Cao, D. X. Zhang, J. Z. Jiang
Summary: The study investigated the effects of thermal cycling on structure and properties in metallic glasses, highlighting contrasting behaviors exhibited by Fe80P20 and Ni60Nb40 metallic glasses during thermal cycling treatment, which are not completely understood at the molecular level.
MATERIALS TODAY PHYSICS
(2021)
