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Related Concept Videos

Metallic Solids02:37

Metallic Solids

18.4K
Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability....
18.4K
Network Covalent Solids02:18

Network Covalent Solids

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Network covalent solids contain a three-dimensional network of covalently bonded atoms as found in the crystal structures of nonmetals like diamond, graphite, silicon, and some covalent compounds, such as silicon dioxide (sand) and silicon carbide (carborundum, the abrasive on sandpaper). Many minerals have networks of covalent bonds.
To break or to melt a covalent network solid, covalent bonds must be broken. Because covalent bonds are relatively strong, covalent network solids are typically...
13.4K

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Related Experiment Video

Updated: Jun 26, 2025

Bulk and Thin Film Synthesis of Compositionally Variant Entropy-stabilized Oxides
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Nanostructured High Entropy Alloys as Structural and Functional Materials.

Wenqing Zhu1,2, Xiang Gao1, Yiyu Yao1

  • 1Department of Mechanical Engineering, College of Engineering, City University of Hong Kong, Kowloon Tong, Kowloon, Hong Kong 999077, China.

ACS Nano
|May 8, 2024
PubMed
Summary

High entropy alloys (HEAs) with nanostructures offer exceptional properties for diverse applications. This review details how nanostructure design in HEAs impacts their mechanical and functional performance.

Keywords:
bulk nanostructured alloyshigh entropy alloyshydrogen evolution reactionhydrogen oxidation reactionnanosized alloysoxygen evolution reactionoxygen reduction reactionstrength-ductility trade-offthermal stability

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Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses
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Area of Science:

  • Materials Science and Engineering
  • Nanotechnology
  • Metallurgy

Background:

  • High entropy alloys (HEAs), introduced in 2004, exhibit remarkable mechanical and functional properties.
  • Advances in understanding atomic ordering and phase formation enable the synthesis of nanostructured HEAs.
  • Nanostructured HEAs are promising for automotive, aerospace, microelectronics, and clean energy sectors.

Purpose of the Study:

  • To provide a comprehensive review of the mechanical and functional properties of nanostructured HEAs.
  • To analyze the influence of various nanostructures on HEA properties.
  • To explore factors affecting nanostructure formation and stability in HEAs.

Main Methods:

  • In-depth analysis of existing research on nanostructured HEAs.
  • Examination of intrinsic and extrinsic factors governing nanostructure formation.
  • Review of mechanical and electrocatalytic properties across different HEA nanostructures (0D, 1D, 2D, 3D).

Main Results:

  • Nanostructure design significantly modulates the mechanical and functional properties of HEAs.
  • Both bulk and nanoscale HEAs (nanoparticles, nanowires, nanosheets) demonstrate unique property profiles.
  • Understanding structure-property relationships is crucial for optimizing HEA performance.

Conclusions:

  • Nanostructured HEAs present vast potential as advanced structural and functional materials.
  • Further research is needed to address challenges in nanostructure design and property control.
  • Opportunities lie in leveraging nanostructure engineering for tailored HEA applications.