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Metallic Glasses and Amorphous Alloys
Research Guide
What is Metallic Glasses and Amorphous Alloys?
Metallic glasses and amorphous alloys are non-crystalline solid metals or metal alloys produced by rapid cooling from the melt, exhibiting unique mechanical properties such as high strength and elastic limits due to their disordered atomic structure.
This field encompasses 55,553 papers on the mechanical properties, structure-property relationships, and processing of bulk metallic glasses and amorphous alloys. Key topics include glass forming ability, shear bands, nanocrystallization, and plastic deformation behavior. Research emphasizes high strength materials and supercooled liquids.
Topic Hierarchy
Research Sub-Topics
Bulk Metallic Glasses Glass Forming Ability
This sub-topic investigates compositional rules, cooling rates, and thermodynamic parameters maximizing critical casting thickness. Researchers screen multi-component alloys using empirical indices and simulations.
Shear Band Dynamics in Metallic Glasses
This sub-topic examines nucleation, propagation, and multiplicity of shear bands during plastic deformation. Researchers use high-speed imaging and DIC to model strain localization.
Mechanical Properties of Amorphous Alloys
This sub-topic characterizes yield strength, elasticity, and fracture toughness across alloy systems under tension and compression. Researchers correlate properties with free volume and structural heterogeneity.
Nanocrystallization in Metallic Glasses
This sub-topic studies devitrification pathways, grain size control, and phase selection during annealing. Researchers optimize heat treatments for enhanced magnetic or mechanical performance.
Plastic Deformation Mechanisms in Bulk Metallic Glasses
This sub-topic explores free volume generation, STZ activation, and heterogeneity aiding large plasticity. Researchers investigate cryogenic, high-strain-rate, and composite strategies.
Why It Matters
Metallic glasses and amorphous alloys offer superior mechanical properties for structural applications in engineering. Schuh et al. (2007) in "Mechanical behavior of amorphous alloys" detail their high strength and limited plasticity, enabling use in high-performance components. Inoue (2000) in "Stabilization of metallic supercooled liquid and bulk amorphous alloys" enabled production of bulk samples larger than 1 mm, facilitating industrial adoption. Yoshizawa et al. (1988) in "New Fe-based soft magnetic alloys composed of ultrafine grain structure" achieved high saturation flux density of 1.9 T and low coercivity of 4 A/m through nanocrystallization of amorphous precursors, advancing soft magnetic materials for transformers with 30% lower core losses.
Reading Guide
Where to Start
"Non-crystalline Structure in Solidified Gold–Silicon Alloys" by Klement et al. (1960) first, as it reports the discovery of metallic glasses via rapid quenching, providing foundational context for all subsequent mechanical and processing studies.
Key Papers Explained
Klement et al. (1960) "Non-crystalline Structure in Solidified Gold–Silicon Alloys" established rapid quenching for amorphization. Spaepen (1977) "A microscopic mechanism for steady state inhomogeneous flow in metallic glasses" modeled shear band mechanics. Inoue (2000) "Stabilization of metallic supercooled liquid and bulk amorphous alloys" enabled bulk formation. Takeuchi and Inoue (2005) "Classification of Bulk Metallic Glasses by Atomic Size Difference, Heat of Mixing and Period of Constituent Elements and Its Application to Characterization of the Main Alloying Element" systematized alloy design rules. Schuh et al. (2007) "Mechanical behavior of amorphous alloys" synthesized property understanding.
Paper Timeline
Most-cited paper highlighted in red. Papers ordered chronologically.
Advanced Directions
Current frontiers involve applying classification rules from Takeuchi and Inoue (2005) to design BMGs with improved plasticity via shear band control, as implied in mechanical behavior analyses by Schuh et al. (2007). Refinement of solid-solution criteria from Zhang et al. (2008) targets high-entropy metallic glasses. No recent preprints available.
Papers at a Glance
| # | Paper | Year | Venue | Citations | Open Access |
|---|---|---|---|---|---|
| 1 | Microstructural development in equiatomic multicomponent alloys | 2004 | Materials Science and ... | 9.2K | ✕ |
| 2 | Mechanical alloying and milling | 2001 | Progress in Materials ... | 7.8K | ✕ |
| 3 | Stabilization of metallic supercooled liquid and bulk amorphou... | 2000 | Acta Materialia | 5.7K | ✕ |
| 4 | Classification of Bulk Metallic Glasses by Atomic Size Differe... | 2005 | MATERIALS TRANSACTIONS | 4.5K | ✓ |
| 5 | Mechanical Alloying And Milling | 2004 | — | 3.9K | ✕ |
| 6 | New Fe-based soft magnetic alloys composed of ultrafine grain ... | 1988 | Journal of Applied Phy... | 3.4K | ✕ |
| 7 | Mechanical behavior of amorphous alloys | 2007 | Acta Materialia | 3.3K | ✕ |
| 8 | Solid‐Solution Phase Formation Rules for Multi‐component Alloys | 2008 | Advanced Engineering M... | 3.2K | ✕ |
| 9 | A microscopic mechanism for steady state inhomogeneous flow in... | 1977 | Acta Metallurgica | 2.9K | ✕ |
| 10 | Non-crystalline Structure in Solidified Gold–Silicon Alloys | 1960 | Nature | 2.8K | ✕ |
Frequently Asked Questions
What defines glass forming ability in bulk metallic glasses?
Glass forming ability refers to the capacity of metallic alloys to form amorphous structures upon cooling from the melt. Takeuchi and Inoue (2005) in "Classification of Bulk Metallic Glasses by Atomic Size Difference, Heat of Mixing and Period of Constituent Elements and Its Application to Characterization of the Main Alloying Element" classify BMGs into seven groups based on atomic size difference, heat of mixing, and periodic table periods. These parameters predict critical cooling rates below 1 K/s for bulk formation.
How does mechanical alloying produce amorphous alloys?
Mechanical alloying involves high-energy ball milling to refine microstructure and induce amorphization. Suryanarayana (2001) in "Mechanical alloying and milling" describes repeated fracturing and cold welding that creates nanoscale layers leading to solid-state amorphization. This method extends amorphization to systems with poor glass forming ability from melt quenching.
What causes plastic deformation in metallic glasses?
Plastic deformation in metallic glasses occurs via inhomogeneous shear banding. Schuh et al. (2007) in "Mechanical behavior of amorphous alloys" explain that shear bands localize strain, limiting ductility despite high strength above 1 GPa. Spaepen (1977) in "A microscopic mechanism for steady state inhomogeneous flow in metallic glasses" models steady-state flow through free volume accumulation in shear bands.
What are key criteria for forming solid solutions in multicomponent alloys related to amorphous alloys?
Solid-solution formation in multicomponent alloys requires atomic size difference below 6.6% and specific mixing enthalpy ranges. Zhang et al. (2008) in "Solid‐Solution Phase Formation Rules for Multi‐component Alloys" define zones for solid solutions, intermediate phases, and bulk metallic glasses using Δ and ΔHmix. These rules guide alloy design for high-entropy alloys overlapping with metallic glass compositions.
How was the first metallic glass discovered?
The first metallic glass, Au-Si, was produced by splat quenching at 10^6 K/s. Klement et al. (1960) in "Non-crystalline Structure in Solidified Gold–Silicon Alloys" reported a diffuse halo in X-ray diffraction confirming the amorphous structure. This demonstrated non-crystalline solidification in metals beyond polymeric glasses.
Open Research Questions
- ? How can shear band propagation be controlled to enhance ductility in bulk metallic glasses?
- ? What processing parameters maximize glass forming ability in multicomponent systems beyond current empirical rules?
- ? Can nanocrystallization be precisely engineered in amorphous alloys to optimize soft magnetic properties without embrittlement?
- ? What microscopic mechanisms govern the transition from homogeneous to inhomogeneous flow in supercooled metallic liquids?
- ? How do atomic size mismatch and mixing enthalpy quantitatively predict amorphous phase stability across diverse alloy groups?
Recent Trends
The field maintains 55,553 papers with sustained focus on mechanical alloying (Suryanarayana 2001, 7784 citations) and bulk metallic glass classification (Takeuchi and Inoue 2005, 4532 citations).
High-impact works like Cantor et al. "Microstructural development in equiatomic multicomponent alloys" (9195 citations) link to high-entropy alloys.
2004No new preprints or news in the last 12 months indicates stable research momentum.
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