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Ludovic Berthier - One of the best experts on this subject based on the ideXlab platform.
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Ultrastable Metallic Glasses in silico
Physical Review Letters, 2020Co-Authors: Anshul D. S. Parmar, Misaki Ozawa, Ludovic BerthierAbstract:We devise a generic strategy and simple numerical models for multi-component Metallic Glasses for which the swap Monte Carlo algorithm can produce highly stable equilibrium configurations equivalent to experimental systems cooled more than $10^7$ times slower than in conventional simulations. This paves the way for a deeper understanding of thermodynamic, dynamic, and mechanical properties of Metallic Glasses. As a first application, we extend configurational entropy measurements down to the experimental glass temperature, and demonstrate a qualitative evolution of the mechanical response of Metallic Glasses of increasing stability towards brittleness.
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Ultrastable Metallic Glasses In Silico.
Physical Review Letters, 2020Co-Authors: Anshul D. S. Parmar, Misaki Ozawa, Ludovic BerthierAbstract:We develop a generic strategy and simple numerical models for multicomponent Metallic Glasses for which the swap Monte Carlo algorithm can produce highly stable equilibrium configurations equivalent to experimental systems cooled more than 10^{7} times slower than in conventional simulations. This paves the way for a deeper understanding of the thermodynamic, dynamic, and mechanical properties of Metallic Glasses. As first applications, we considerably extend configurational entropy measurements down to the experimental glass temperature, and demonstrate a qualitative change of the mechanical response of Metallic Glasses of increasing stability toward brittleness.
Akihisa Inoue - One of the best experts on this subject based on the ideXlab platform.
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Introduction to Amorphous Alloys and Metallic Glasses
Novel Structured Metallic and Inorganic Materials, 2019Co-Authors: Shin-ichi Yamaura, Wei Zhang, Akihisa InoueAbstract:The development of amorphous alloys and Metallic Glasses is briefly overviewed, and their structure, glass-forming ability (GFA), and physical, chemical, mechanical and magnetic properties are introduced. In particular, the history of the development of amorphous alloys and Metallic Glasses and the difference between amorphous alloys and Metallic Glasses are summarized in this chapter.
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Bulk Metallic Glasses: Formation and Applications
Reference Module in Materials Science and Materials Engineering, 2016Co-Authors: Akihisa Inoue, F.l. KongAbstract:A variety of transition metal base glassy alloys with a distinct glass transition and large undercooled liquid region above 70 K before crystallization were found around 1988–1990, followed by the first synthesis of bulk Metallic Glasses by copper mold casting by use of the high stability of undercooled liquid to crystallization. Since these discoveries, much effort has been devoted to bulk Metallic Glasses and great number of knowledge has been accumulated to date. As a result, bulk Metallic Glasses have opened up a novel academic and engineering field in Metallic materials. This article reviews the development history, fundamental properties, engineering characteristics, production techniques, applications, recent topics, and future perspectives.
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Composition Effect on Intrinsic Plasticity or Brittleness in Metallic Glasses
Scientific Reports, 2014Co-Authors: Yuan-yun Zhao, Akihisa Inoue, Baolong Shen, Chuntao Chang, Jian Liu, Xinmin WangAbstract:The high plasticity of Metallic Glasses is highly desirable for a wide range of novel engineering applications. However, the physical origin of the ductile/brittle behaviour of Metallic Glasses with various compositions and thermal histories has not been fully clarified. Here we have found that Metallic Glasses with compositions at or near interMetallic compounds, in contrast to the ones at or near eutectics, are extremely ductile and also insensitive to annealing-induced embrittlement. We have also proposed a close correlation between the element distribution features and the plasticity of Metallic Glasses by tracing the evolutions of the element distribution rearrangement and the corresponding potential energy change within the sliding shear band. These novel results provide useful and universal guidelines to search for new ductile Metallic Glasses at or near the interMetallic compound compositions in a number of glass-forming alloy systems.
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Bulk Metallic Glasses
2010Co-Authors: C. Suryanarayana, Akihisa InoueAbstract:Introduction Motivation Advanced Materials Rapid Solidification Processing Mechanical Alloying Outline of the Book Metallic Glasses Distinction between Crystals and Glasses Differences between Amorphous Alloys and Metallic Glasses The Concepts of Glass Formation Thermodynamics and Kinetics of Glass Formation Methods to Synthesize Metallic Glasses Bulk Metallic Glasses Potential Resources of Literature on Metallic Glasses Glass-Forming Ability of Alloys Critical Cooling Rate Reduced Glass Transition Temperature Deep Eutectics Topological Models Bulk Metallic Glasses Inoue Criteria Exceptions to the Above Criteria New Criteria Transformation Temperatures of Glasses Thermodynamic Modeling Structural and Topological Parameters Physical Properties Computational Approaches Miscellaneous Criteria Criteria for Glass Formation by Non-Solidification Methods Synthesis of Bulk Metallic Glasses Principles of Rapid Solidification Processing General Techniques to Achieve High Rates of Solidification Melt Spinning Bulk Metallic Glasses Bulk Metallic Glass Casting Methods Bulk Metallic Glass Composites Mechanical Alloying Bulk Metallic Glass Foams Crystallization Behavior Methodology Crystallization Modes in Melt-Spun Ribbons Differences in the Crystallization Behavior between Melt-Spun Ribbons and Bulk Metallic Glasses Thermal Stability of Metallic Glasses Crystallization Temperatures and Their Compositional Dependence Annealing of Bulk Metallic Glasses Effect of Environment Effect of Pressure during Annealing Physical Properties Density Thermal Expansion Diffusion Electrical Resistivity Specific Heat Viscosity Corrosion Behavior Terminology and Methodology Copper-Based Bulk Metallic Glasses Iron-Based Bulk Metallic Glasses Magnesium-Based Bulk Glassy Alloys Nickel-Based Bulk Metallic Glasses Titanium-Based Bulk Metallic Glasses Zirconium-Based Bulk Metallic Glasses Other Bulk Metallic Glassy Alloys Mechanical Behavior Deformation Behavior Deformation Maps Temperature Rise at Shear Bands Strength Ductility Fatigue Yield Behavior BMG Composites Magnetic Properties Soft Magnetic Materials Nanocrystalline Alloys Hard Magnetic Materials Applications Special Characteristics of Bulk Metallic Glasses Structural Applications Chemical Applications Magnetic Applications Miscellaneous Applications Epilogue Size and Shape Mechanical Properties Magnetic Properties Fundamental Properties Index References appear at the end of each chapter.
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extraordinary plasticity of ductile bulk Metallic Glasses
Physical Review Letters, 2006Co-Authors: Mingwei Chen, Akihisa Inoue, Wei Zhang, T SakuraiAbstract:Shear bands generally initiate strain softening and result in low ductility of Metallic Glasses. In this Letter, we report high-resolution electron microscope observations of shear bands in a ductile Metallic glass. Strain softening caused by localized shearing was found to be effectively prevented by nanocrystallization that is in situ produced by plastic flow within the shear bands, leading to large plasticity and strain hardening. These atomic-scale observations not only well explain the extraordinary plasticity that was recently observed in some bulk Metallic Glasses, but also reveal a novel deformation mechanism that can effectively improve the ductility of monolithic Metallic Glasses.
Haozhe Liu - One of the best experts on this subject based on the ideXlab platform.
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Pressure-induced polyamorphism in lanthanide-solute Metallic Glasses: Pressure-induced polyamorphism in lanthanide-solute Metallic Glasses
physica status solidi (RRL) - Rapid Research Letters, 2017Co-Authors: Luhong Wang, Haiyan Zhao, Karena W. Chapman, Peter J. Chupas, Haozhe LiuAbstract:The electronic structure inheritance of lanthanide-solvent atoms in lanthanide-based Metallic Glasses has been proposed. Is a polyamorphism possible in lanthanide-solute Metallic Glasses? So far, polyamorphic phase transitions in Metallic glass containing lanthanide have been observed only in lanthanide-solvent Metallic Glasses. Here, a pressure-induced transition between two distinct amorphous states, accompanied by a 7% volume collapse at ambient pressure, was observed in La43.4Pr18.6Al14Cu24 Metallic glass, with low lanthanide content, by using in situ X-ray total scattering method. The transformation also indicated by changes in short range and medium range order. Thus, it is proposed that the lanthanide-solute Metallic Glasses also inherit 4f electronic transition from pure lanthanide element in polyamorphic transition. This discovery offers a supplement to research on lanthanide-based Metallic Glasses, which further provides a new perspective of the polyamorphic transformation in Metallic Glasses containing lanthanide element.
Anshul D. S. Parmar - One of the best experts on this subject based on the ideXlab platform.
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Ultrastable Metallic Glasses in silico
Physical Review Letters, 2020Co-Authors: Anshul D. S. Parmar, Misaki Ozawa, Ludovic BerthierAbstract:We devise a generic strategy and simple numerical models for multi-component Metallic Glasses for which the swap Monte Carlo algorithm can produce highly stable equilibrium configurations equivalent to experimental systems cooled more than $10^7$ times slower than in conventional simulations. This paves the way for a deeper understanding of thermodynamic, dynamic, and mechanical properties of Metallic Glasses. As a first application, we extend configurational entropy measurements down to the experimental glass temperature, and demonstrate a qualitative evolution of the mechanical response of Metallic Glasses of increasing stability towards brittleness.
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Ultrastable Metallic Glasses In Silico.
Physical Review Letters, 2020Co-Authors: Anshul D. S. Parmar, Misaki Ozawa, Ludovic BerthierAbstract:We develop a generic strategy and simple numerical models for multicomponent Metallic Glasses for which the swap Monte Carlo algorithm can produce highly stable equilibrium configurations equivalent to experimental systems cooled more than 10^{7} times slower than in conventional simulations. This paves the way for a deeper understanding of the thermodynamic, dynamic, and mechanical properties of Metallic Glasses. As first applications, we considerably extend configurational entropy measurements down to the experimental glass temperature, and demonstrate a qualitative change of the mechanical response of Metallic Glasses of increasing stability toward brittleness.
Jan Schroers - One of the best experts on this subject based on the ideXlab platform.
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Critical Crystallization for Embrittlement in Metallic Glasses.
Physical Review Letters, 2015Co-Authors: Jittisa Ketkaew, Ze Liu, Wen Chen, Jan SchroersAbstract:We studied the effect of crystallization on the embrittlement of bulk Metallic Glasses. Specifically, we measured fracture toughness for Zr(44)Ti(11)Cu(10)Ni(10)Be(25) and Pd(43)Cu(27)Ni(10)P(20) after annealing at various times to introduce controlled volume fraction of crystallization. We found that crystallization of up to ∼6% by volume does not measurably affect fracture toughness. When exceeding ∼6%, a dramatic drop in fracture toughness occurs; an additional 1% of crystallization reduces fracture toughness by 50%. Such a dramatic transition can be explained by the interaction among the crystals' stress fields in the amorphous matrix that becomes effective at ∼7% crystallinity. Our findings of a critical crystallization for embrittlement of Metallic Glasses help in designing tough Metallic Glasses and their composites, as well as defining processing protocols for the unique thermoplastic forming of Metallic Glasses to avoid embrittlement.
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combinatorial development of bulk Metallic Glasses
Nature Materials, 2014Co-Authors: Shiyan Ding, Yan-hui Liu, Ze Liu, Sungwoo Sohn, F J Walker, Jan SchroersAbstract:The identification of multicomponent alloys out of a vast compositional space is a daunting task, especially for bulk Metallic Glasses composed of three or more elements. Despite an increasing theoretical understanding of glass formation, bulk Metallic Glasses are predominantly developed through a sequential and time-consuming trial-and-error approach. Even for binary systems, accurate quantum mechanical approaches are still many orders of magnitude away from being able to simulate the relatively slow kinetics of glass formation. Here, we present a high-throughput strategy where ∼3,000 alloy compositions are fabricated simultaneously and characterized for thermoplastic formability through parallel blow forming. Using this approach, we identified the composition with the highest thermoplastic formability in the glass-forming system Mg-Cu-Y. The method provides a versatile toolbox for unveiling complex correlations of material properties and glass formation, and should facilitate a drastic increase in the discovery rate of Metallic Glasses.
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Joining of bulk Metallic Glasses in air
Acta Materialia, 2014Co-Authors: Wen Chen, Ze Liu, Jan SchroersAbstract:Abstract We present a thermoplastic deforming method to join Metallic Glasses in air. Mechanistically during straining of the interface the oxide layer breaks and pristine alloy flows towards the interface and forms a Metallic bond. To demonstrate the effectiveness of this method we chose reactive Zr 35 Ti 30 Cu 7.5 Be 27.5 as an example bulk Metallic glass system. A model is introduced which quantitatively predicts the bonding strength solely from the shear strength of the Metallic glass, the initial surface roughness, and the applied strain. The ability to join even reactive Metallic Glasses in air on a timescale of the order of milliseconds to seconds at low pressure and temperature with predictable joint strength suggest a highly practical and economic method to join Metallic Glasses.
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Designing tensile ductility in Metallic Glasses
Nature Communications, 2013Co-Authors: Baran Sarac, Jan SchroersAbstract:Metallic Glasses are normally stronger than their crystalline counterparts, but not good at deforming under tensile stress. Sarac and Schroers test the ductility of Metallic Glasses in a precisely engineered microsystem and identify an ideal heterostructure with maximized strength and toughness.
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Critical fictive temperature for plasticity in Metallic Glasses
Nature Communications, 2013Co-Authors: Golden Kumar, Yan-hui Liu, Pascal Neibecker, Jan SchroersAbstract:A long-sought goal in Metallic Glasses is to impart ductility without conceding their strength and elastic limit. The rational design of tough Metallic Glasses, however, remains challenging because of the inability of existing theories to capture the correlation between plasticity, composition and processing for a wide range of glass-forming alloys. Here we propose a phenomenological criterion based on a critical fictive temperature, T(fc), which can rationalize the effect of composition, cooling rate and annealing on room-temperature plasticity of Metallic Glasses. Such criterion helps in understanding the widespread mechanical behaviour of Metallic Glasses and reveals alloy-specific preparation conditions to circumvent brittleness.
