Article
Physics, Multidisciplinary
Chi Zhang, Hua-Shan Liu, Hai-Long Peng
Summary: We systematically investigated the structures of Cu-Zr metallic glass by varying the Cu concentration in molecular dynamics simulations. The addition of Cu significantly increased the nearest atomic distance between Zr atoms, which was related to the coordination behavior between Cu and Zr atoms. The nearest connection was analyzed in terms of quadrilateral, pentagonal, hexagonal, and heptagonal bipyramid structures. Although the population of denser structures increased with increasing Cu concentration, the connection distances between Zr-Zr pairs also increased, leading to the expansion of the Zr-Zr nearest atomic distance. These findings reveal the interplay between chemical interaction and geometric packing in Cu-Zr metallic glasses at the atomic level.
Article
Chemistry, Applied
Qiang Zheng, Xiu Su, Lingyun Li, Juan Du
Summary: We observed pronounced low-temperature specific-heat Cp anomalies in the Mg59.5Cu22.9Ag6.6Gd11 bulk metallic glass (BMG). The behavior of the BMG resembled that of a heavy fermion system, with an extrapolated electron's temperature coefficient of up to 681.8 mJ/(molGd, Kappa 2) at 0 K. The enhancement of the conduction-electron effective mass below 7.5 K indicated that the BMG was not a free-electron-like solid. The excess specific heat was attributed to tunneling states and spin glass state, and the Boson peak temperature was higher than that of other BMGs.
JOURNAL OF RARE EARTHS
(2023)
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
Materials Science, Multidisciplinary
Xuelian Wu, Si Lan, Xiyang Li, Ming Yang, Zhenduo Wu, Xiaoya Wei, Haiyan He, Muhammad Naeem, Jie Zhou, Zhaoping Lu, Elliot Paul Gilbert, Dong Ma, Xun-Li Wang
Summary: This paper presents a new approach to study the crystallization of Zr45.5Cu45.5Al9 bulk metallic glass (BMG) during isothermal annealing. By analyzing the data from simultaneous differential scanning calorimetry and small angle neutron scattering measurements, the authors identified three stages in the crystallization process: incubation, amorphous-to-crystalline structural ordering, and continuous chemical redistribution. The findings were further confirmed by composition analysis using atom probe tomography, which revealed the formation of a transition region where Al was expelled into the matrix.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2022)
Article
Materials Science, Ceramics
Shenghan Zhou, Zhijian Xu, Tao Tang, Kaiyao Zha, Tong Ye, Dandan Dong, Chuang Dong
Summary: This study interprets the three eutectic compositions in the Cu-Zr system and their glass-forming mechanisms using a dual-cluster model.
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2022)
Article
Chemistry, Physical
Yong Joo Kim, Jong Woong Park, Woo Chul Kim, Jeong Soo Kim, Won Tae Kim, Do Hyang Kim
Summary: The addition of boron improves the glass forming ability and thermal stability of Ti35Zr15Ni40Cu10 metallic glass, leading to outstanding superelasticity after crystallization. Boron plays a significant role in maintaining a stable supercooled liquid and refining grain size in the alloy.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Nanoscience & Nanotechnology
Dongdong Li, Jintao Zhou, Heng Chen, Bingyan Qu, Rulong Zhou
Summary: The large surface area to volume ratio of metallic glass nanoparticles leads to unique properties and enhanced stability in the core region. The low-temperature heat capacity of the nanoparticles depends on their size.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2023)
Article
Materials Science, Multidisciplinary
Lukasz Szczepanski, Markus Bambach, Felix Jensch, Andrzej Ambroziak, Tomasz Kurzynowski
Summary: In recent years, Fe-based metallic glasses have been extensively researched for their favorable mechanical and magnetic properties. Breakthroughs have been made in producing these materials in Laser Powder Bed Fusion technology, allowing the production of elements of any shape. The microstructure of the manufactured parts plays a crucial role in determining their properties.
MATERIALS & DESIGN
(2021)
Article
Chemistry, Physical
Y. Ohashi, T. Wada, H. Kato
Summary: The glass-forming ability of Zr-Cu-based metallic glass with high entropy was investigated by adding elements such as Ag, Hf, and Ni. The study found that the addition of elements created new competitive liquid crystalline phases and improved the glass-forming ability.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Physical
C. R. Onyeagba, M. Valashani, H. Wang, C. Brown, P. Yarlagadda, T. Tesfamichael
Summary: New functional coatings of thin film polymorphic metallic glasses (Ti-Fe-Cu, Zr-Fe-Al, and Zr-W-Cu) were deposited on SS316L and Ti substrates using co-sputtering technique. The films exhibited excellent surface and nanomechanical properties, making them potential functional surfaces for biomedical applications.
SURFACES AND INTERFACES
(2023)
Article
Geochemistry & Geophysics
Michele Cassetta, Francesco Vetere, Marco Zanatta, Diego Perugini, Matteo Alvaro, Beatrice Giannetta, Claudio Zaccone, Nicola Daldosso
Summary: The study presents an alternative method to study the glassy pools in highly crystallized basaltic-andesite and trachybasalt samples. Polarized micro-Raman spectra were used to analyze the glassy portions and the results showed an increasing polymerization degree in the residual glass structures. The MYEGA formalism approach was validated to retrieve the residual melt viscosity of the partly crystallized samples.
Article
Chemistry, Physical
Qi An, William L. Johnson, Konrad Samwer, Sydney L. Corona, Yidi Shen, William A. Goddard
Summary: The study reveals a similar L-G transition and heterogeneous G-phase in simulations of liquid Cu-Zr bulk glass, with the G-phase having icosahedrally ordered cores. The transition is associated with the emergence of elastic rigidity in metallic liquids, leading to a core-shell nano-composite structure likely formed to accommodate strain mismatch between stiff core regions and more compliant liquid-like medium.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2021)
Article
Nanoscience & Nanotechnology
Tuo Wang, Qiqi Hou, Lianshun Zhang
Summary: The addition of oxygen was found to enhance the plasticity of Zr60Cu25Al15 bulk metallic glass, but excessive oxygen deteriorated its plasticity, leading to partial crystallization. The improved plasticity was attributed to a heterogeneous Cu-rich amorphous phase, while the decrease in plasticity was caused by excessive oxygen leading to partial crystallization.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Materials Science, Ceramics
Lu Li, Lina Hu, Lunyong Zhang, Yongjiang Huang, Kaikai Song, Hongxian Shen, Sida Jiang, Zheng Wang, Xi Zhao, Jianfei Sun
Summary: The research on liquid-liquid transition (LLT) has greatly enhanced the understanding of the liquid structure and evolution, with significant implications for glass formation. However, the impact of LLT on vitrification and glass structures is still unclear due to experimental challenges in exploring LLT in high-temperature melts. This study examines LLT in Zr-Cu-Ni-Al melts and reveals that superheated fragility is closely related to glass-forming ability. The competition between crystal-like and icosahedral-like clusters affects the crystallization behavior and changes in both medium-range order structure and short-range order structure indicate LLT.
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2023)
Article
Thermodynamics
Adam Revesz, Talaye Arjmandabasi, Erhard Schafler, David J. Browne, Zsolt Kovacs
Summary: Bulk metallic glass of Cu38Zr54Al8 composition was synthesized and subjected to severe plastic deformation. The microstructure and thermal behavior of the glass were examined using X-ray diffraction and differential scanning calorimetry. The glass showed excellent glass forming parameters and a two-stage devitrification event during heating. The glassy structure was preserved during the deformation process, indicating high stability against devitrification.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2023)
