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
Ruitao Qu, Robert Maass, Zengqian Liu, Dominik Tonnies, Lin Tian, Robert O. Ritchie, Zhefeng Zhang, Cynthia A. Volkert
Summary: This study discovered the strongest metallic alloy known, which is flaw-insensitive at the micrometer scale and exhibits properties that deviate from traditional theories. The experimental results show that the fracture toughness of this ultra-strong glassy alloy increases with increasing sample size.
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
Multidisciplinary Sciences
J. Dong, Y. Huan, B. Huang, J. Yi, Y. H. Liu, B. A. Sun, W. H. Wang, H. Y. Bai
Summary: The research discovered that metallic glass surfaces exhibit shear modulus softening and have a much thicker surface than previously thought. This could result in a transition of metallic glasses from brittle to ductile as their size decreases.
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
Afrouz Hassanpour, Mayur Vaidya, Sergiy Divinski, Gerhard Wilde
Summary: The impact of different thermo-mechanical treatments on shear band diffusion in a model bulk metallic glass was investigated. It was found that HPT processing and cold rolling can enhance diffusion rates, while cryogenic thermo-cycling further increases shear band diffusion speed.
Article
Materials Science, Multidisciplinary
Kunsen Zhu, Pingjun Tao, Chaohan Zhang, Zhihao Zhao, Weijian Zhang, Yuanzheng Yang, K. Kaviyarasu
Summary: The plastic deformation behavior of metallic glass at room temperature is highly sensitive to strain rates, with plastic strain, yield strength, compressive strength, and fracture strength increasing as strain rates decrease. The number and density of shear bands also increase with decreasing strain rates, influencing the overall fracture morphology and serrated flow behavior.
MATERIALS TODAY COMMUNICATIONS
(2021)
Article
Chemistry, Physical
Zibo Zhang, Jian Kong, Xiangkui Liu, Xinxiang Song, Kewei Dong
Summary: By adjusting the processing parameters, a La74Al14Cu6Ni6 bulk metallic glass matrix composite is produced with in situ spherical alpha-La phases and micron sized AlLa3 intermetallic compounds, resulting in a good combination of high strength and plasticity. The formation of ductile bulky spherical alpha-La phases and hard AlLa3 intermetallic compounds effectively hinder rapid shear band propagation, leading to a significant increase in plasticity. Additionally, the in situ formed AlLa3 intermetallic compounds dramatically improve the fracture strength of the composite.
Article
Chemistry, Physical
R. B. Strozi, D. R. Leiva, J. Huot, W. J. Botta, G. Zepon
Summary: Various Mg-based alloys were synthesized via high energy ball milling, with the quinary MgVAlCrNi alloy showing a single-phase structure and being a lightweight high-entropy alloy with low hydrogen storage capacity. Non-stoichiometric alloys also exhibited low hydrogen storage capacity.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Nanoscience & Nanotechnology
Dina V. Dudina, Boris B. Bokhonov, Igor S. Batraev, Yusif N. Amirastanov, Arina V. Ukhina, Ivanna D. Kuchumova, Mikhail A. Legan, Aleksey N. Novoselov, Konstantin B. Gerasimov, Ivan A. Bataev, Konstantinos Georgarakis, Guilherme Yuuki Koga, Yaofeng Guo, Walter Jose Botta, Alberto Moreira Jorge
Summary: In this study, the interaction between Fe66Cr10Nb5B19 metallic glass and aluminum during spark plasma sintering (SPS) was investigated, revealing the formation of reaction layers around the Fe-based cores. The Vickers hardness of composites increased with higher sintering temperatures due to the formation of thicker reaction layers at the interface. Comparison with traditional sintering methods suggests that interfacial resistance may play a crucial role in influencing reaction advancement and formation of intermetallics in metal matrix composites.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Materials Science, Ceramics
G. Y. Koga, T. Ferreira, Y. Guo, D. D. Coimbrao, A. M. Jorge Jr, C. S. Kiminami, C. Bolfarini, W. J. Botta
Summary: Amorphous and amorphous/nanocrystalline microstructures exhibit a good balance between corrosion resistance and wear resistance, while the crystalline microstructures are more suitable for load-bearing applications that do not require high corrosion resistance.
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2021)
Article
Energy & Fuels
Renato Belli Strozi, Daniel Rodrigo Leiva, Guilherme Zepon, Walter Jose Botta, Jacques Huot
Summary: This study investigated the addition of a non-hydride forming element in the multicomponent Ti-V-Nb-M system using the CALPHAD approach. Cr was selected as the fourth alloying element, and (TiVNb)(100-x)Cr-x alloys were synthesized and found to absorb hydrogen at room temperature without activation treatment. Increasing the Cr content in the alloys resulted in higher equilibrium pressures, indicating tunable hydrogen storage properties could be achieved.
Review
Materials Science, Multidisciplinary
Dina Dudina, Konstantinos Georgarakis, Eugene A. Olevsky
Summary: This review discusses the application of field-assisted sintering in the powder metallurgy processing of aluminium and magnesium matrix composites, and presents the characteristics of materials obtained by spark plasma sintering, microwave sintering, and induction sintering.
INTERNATIONAL MATERIALS REVIEWS
(2023)
Article
Chemistry, Physical
Dina Dudina, Konstantinos Georgarakis
Summary: This article highlights the recent trend of developing metal matrix composites (MMCs) reinforced with particles of core-shell structure. The core-shell approach allows for strengthening without sacrificing ductility, showing great potential for enhancing the mechanical properties of MMCs.
Article
Materials Science, Multidisciplinary
Martin E. Stiehler, Nikolaos T. Panagiotopoulos, Dean S. Keeble, Yurii P. Ivanov, Melita Menelaou, Mark R. Jolly, A. Lindsay Greer, Konstantinos Georgarakis
Summary: The effect of substituting Cu with Ni or Co on the atomic structure of the Zr60Cu30Al10 ternary bulk metallic glass is investigated. The substitution leads to an increase in structural disorder, which is consistent with the confusion principle. Despite their similar atomic size, the addition of Ni or Co has different effects on the thermal stability of the alloy.
MATERIALS TODAY COMMUNICATIONS
(2022)
Article
Metallurgy & Metallurgical Engineering
K. Konakoglou, C. Mathiou, E. Georgatis, K. Georgarakis, A. E. Karantzalis
Summary: A (FeMnNi)(84)(AlTi)(16) high-entropy alloy was successfully produced by vacuum arc melting. The microstructure revealed the presence of two FCC phases and potential precipitates. Insufficient solution treatment parameters resulted in the incomplete dissolution of the as-cast precipitates, leading to the development of a dual FCC matrix. The maximum hardness was attributed to precipitation shearing mechanism, while the lower hardness was due to a change in the main strengthening mechanism.
METALLOGRAPHY MICROSTRUCTURE AND ANALYSIS
(2022)
Article
Materials Science, Composites
Vyacheslav Kvashnin, Dina Dudina, Arina Ukhina, Guilherme Yuuki Koga, Konstantinos Georgarakis
Summary: In metallic glass-reinforced metal matrix composites, the glassy phase serves as a soft binder and hard reinforcing phase during consolidation. This study demonstrates the advantage of glassy reinforcing particles for the densification of aluminum matrix composites, and shows that forming particle chains leads to a more pronounced densification enhancement effect.
JOURNAL OF COMPOSITES SCIENCE
(2022)
Article
Materials Science, Multidisciplinary
K. Emurlaev, I. Bataev, I. Ivanov, D. Lazurenko, V. Burov, A. Ruktuev, D. Ivanov, M. Rosenthal, M. Burghammer, K. Georgarakis, A. M. Jorge
Summary: In this paper, the structural changes of AISI 321 austenitic stainless steel during frictional loading were analyzed using the nondestructive operando method based on synchrotron X-ray diffraction. The study observed the gamma-(epsilon, alpha') transformation and the formation of a mechanically-mixed layer (MML). The microstructure of the sample was further analyzed using scanning electron microscopy to understand the characteristics and changes of the MML.
Review
Chemistry, Physical
Konstantinos Georgarakis, Dina V. Dudina, Vyacheslav I. Kvashnin
Summary: This review article discusses the progress in the study of metal matrix composites (MMCs) reinforced with metallic glasses and amorphous alloys, including the composition, design methods and fabrication techniques of different metallic matrices, as well as the interaction and influence on properties.
Article
Materials Science, Multidisciplinary
Vyacheslav I. Kvashnin, Dina Dudina, Boris B. Bokhonov, Sergey A. Petrov, Arina V. Ukhina, Konstantinos Georgarakis, Francisco Gil Coury, Guilherme Yuuki Koga
Summary: In this study, a glassy Fe66Cr10Nb5B19 alloy and its crystalline counterpart were spark plasma sintered with aluminum at 570 degrees C to investigate the interfacial reactions in the systems. It was found that in the mixture containing the crystalline alloy, alpha-(Fe,Cr) and Fe2B reacted with aluminum forming the Fe-Al inter-metallic reaction products. The absence of alpha-(Fe,Cr) and Fe2B in the composite sintered from the glassy alloy was confirmed by Mo center dot ssbauer spectroscopy. Overall, the crystalline alloy showed higher reactivity towards aluminum than the glassy alloy, which can be attributed to the presence of alpha-(Fe,Cr), a Fe-rich phase.
Article
Materials Science, Composites
Dina V. Dudina, Vyacheslav I. Kvashnin, Boris B. Bokhonov, Mikhail A. Legan, Aleksey N. Novoselov, Yuliya N. Bespalko, Alberto Moreira Jorge Jr, Guilherme Y. Koga, Arina V. Ukhina, Alexandr A. Shtertser, Alexander G. Anisimov, Konstantinos Georgarakis
Summary: The microstructural features and mechanical properties of composites formed by spark plasma sintering of Al + 20 vol.% Fe and Al + 20 vol.% Fe66Cr10Nb5B19 mixtures composed of micrometer-sized particles were investigated. The pressure applied during sintering affected the thickness of reaction products formed between the iron particles and aluminum. The nature of reinforcement particles played a significant role in determining the hardness and compressive strength of the composites.
JOURNAL OF COMPOSITES SCIENCE
(2023)
Article
Chemistry, Physical
Jessica Bruna Ponsoni, Mateusz Balcerzak, Walter Jose Botta, Michael Felderhoff, Guilherme Zepon
Summary: This study investigates a multicomponent alloy with C14 Laves phase structures, which demonstrates promising hydrogen storage capabilities at room temperature. The alloy was designed using computational thermodynamic tools and synthesized as a single C14 Laves phase. Experimental results show that the alloy can reversibly absorb and desorb a large amount of hydrogen at room temperature under moderate pressures, with excellent cycling stability.
JOURNAL OF MATERIALS CHEMISTRY A
(2023)
Article
Chemistry, Multidisciplinary
Dina V. Dudina, Vyacheslav I. Kvashnin, Alexander A. Matvienko, Anatoly A. Sidelnikov, Alexander I. Gavrilov, Arina V. Ukhina, Alberto Moreira Jorge, Konstantinos Georgarakis
Summary: Metallic-glass-reinforced metal matrix composites are a new type of composite materials, in which amorphous alloys act as reinforcement. This study investigated the morphology of the reaction products formed when Fe66Cr10Nb5B19 metallic glass particles interacted with aluminum. The composites were processed using spark plasma sintering, hot pressing, or a combination of both. The reaction products observed included dense layers covering the alloy cores, needles protruding from the shells, and needles and platelets distributed in the aluminum matrix. The role of the liquid phase in the structure formation and the occurrence of pores due to the Kirkendall effect were discussed.
CHEMISTRY-SWITZERLAND
(2023)