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Related Concept Videos

Metallic Solids02:37

Metallic Solids

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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....
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Unlike ionic or small covalent molecules, polymers do not form crystalline solids due to the diffusion limitations of their long-chain structures. However, polymers contain microscopic crystalline domains separated by amorphous domains.
Crystalline domains are the regions where polymer chains are aligned in an orderly manner and held together in proximity by intermolecular forces. For example, chains in the crystalline domains of polyethylene and nylon are bound together by van der Waals...
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Structures of Solids

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Solids in which the atoms, ions, or molecules are arranged in a definite repeating pattern are known as crystalline solids. Metals and ionic compounds typically form ordered, crystalline solids. A crystalline solid has a precise melting temperature because each atom or molecule of the same type is held in place with the same forces or energy. Amorphous solids or non-crystalline solids (or, sometimes, glasses) which lack an ordered internal structure and are randomly arranged. Substances that...
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Recrystallization is a purification technique used to separate impurities from solid compounds. In this technique, no chemical reactions occur. Instead, it exploits physical properties only, specifically, the solubility differences between the desired compound and impurities, either at a single temperature or at different temperatures, and under other selected conditions. The solid-solution equilibrium (solubility equilibrium) of each component in the solution represents a binary phase...
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Entropy02:39

Entropy

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Salt particles that have dissolved in water never spontaneously come back together in solution to reform solid particles. Moreover, a gas that has expanded in a vacuum remains dispersed and never spontaneously reassembles. The unidirectional nature of these phenomena is the result of a thermodynamic state function called entropy (S). Entropy is the measure of the extent to which the energy is dispersed throughout a system, or in other words, it is proportional to the degree of disorder of a...
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Bulk and Thin Film Synthesis of Compositionally Variant Entropy-stabilized Oxides
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Composition Design Strategy for High Entropy Amorphous Alloys.

Hongyu Ding1,2, Qi Zhang3, Kefu Yao2

  • 1Marine Equipment and Technology Institute, Jiangsu University of Science and Technology, Zhenjiang 212003, China.

Materials (Basel, Switzerland)
|January 23, 2024
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Summary

High entropy amorphous alloys (HEAAs) offer unique properties, but their design methods need further exploration. This study presents effective strategies for HEAA composition design, leading to enhanced material strength and glass-forming ability.

Keywords:
amorphous alloybulk metallic glasscomposition design strategyglass-forming abilityhigh entropy alloy

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Area of Science:

  • Materials Science
  • Alloy Design
  • Amorphous Materials

Background:

  • High entropy amorphous alloys (HEAAs) are gaining attention for their unique properties.
  • Effective composition design strategies for HEAAs are crucial but underexplored.
  • Understanding the influence of high entropy on alloy properties is essential.

Purpose of the Study:

  • To summarize effective composition design strategies for HEAAs.
  • To explore the development of new HEAAs with improved properties.
  • To discuss the impact of high entropy and potential applications.

Main Methods:

  • Adjusting atomic ratios in quinary bulk metallic glasses.
  • Utilizing similar element addition/substitution in alloy development.
  • Combining elements from ternary/quaternary bulk metallic glasses.

Main Results:

  • Designed a Ti20Zr20Cu20Ni20Be20 HEAA with a high fracture strength of 2315 MPa.
  • Developed Ti-(Zr, Hf, Nb)-Cu-Ni-Be HEAAs with good glass-forming ability (max critical diameter of 30 mm).
  • Demonstrated the effectiveness of combining elements from simpler metallic glasses for new HEAA design.

Conclusions:

  • Composition design strategies significantly impact HEAA properties.
  • HEAAs exhibit promising strength and glass-forming ability.
  • This research provides a foundation for future HEAA development and application.