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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.
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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.
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In designing structural elements and machine parts using ductile materials, it is crucial to ensure that these components withstand applied stresses without yielding. Yielding is initially determined through a tensile test, which evaluates the material's response to uniaxial stress. However, tensile stress is insufficient when components face biaxial or plane stress conditions This condition requires advanced criteria to predict failure.
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The stress-strain relationship in ductile materials such as structural steel or aluminium is intricate and progresses through several stages. When a specimen is loaded, it initially exhibits a linear length increase, depicted by a steep straight line on the stress-strain diagram. It indicates the material is elastically deforming and will return to its original shape once unloaded. However, when a critical stress value is reached, plastic deformation begins. This stage sees substantial...
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Strong-Yet-Ductile Eutectic Alloys Employing Cocoon-Like Nanometer-Sized Dislocation Cells.

Peijian Shi1,2, Yi Li1, Xin Jiang1

  • 1State Key Laboratory of Advanced Special Steel, Shanghai Key Laboratory of Advanced Ferrometallurgy, School of Materials Science and Engineering, Shanghai University, Shanghai, 200444, China.

Advanced Materials (Deerfield Beach, Fla.)
|June 7, 2024
PubMed
Summary
This summary is machine-generated.

Researchers developed a novel cocoon-like nano-meshed dislocation network (CNN-D) in eutectic alloys. This breakthrough significantly enhances both strength and ductility, outperforming conventional and advanced alloy categories.

Keywords:
cocoon‐like nano‐meshed network of dislocationeutectic alloynanometer‐spaced planar slip bandstable tensile flowthermomechanical processing

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Area of Science:

  • Materials Science
  • Metallurgy
  • Nanotechnology

Background:

  • Eutectic alloys (EAs) offer excellent castability for large structural parts.
  • Conventional EAs (CEAs) lack competitive strength-ductility combinations.
  • Nanoprecipitates are crucial for anchoring dislocations in advanced alloys.

Purpose of the Study:

  • To develop a novel microstructural strategy for enhancing the mechanical properties of eutectic alloys.
  • To investigate the effectiveness of a cocoon-like nano-meshed network of dislocations (CNN-D) in improving strength and ductility.
  • To surpass the performance of existing CEAs and additively manufactured eutectic high-entropy alloys.

Main Methods:

  • Thermomechanical processing of cast Ni-Fe-Al eutectic alloys.
  • Recovery annealing to induce dislocation rearrangement.
  • Microstructural analysis to characterize the cocoon-like nano-meshed network of dislocations (CNN-D).

Main Results:

  • A unique cocoon-like nano-meshed network of dislocations (CNN-D), as fine as 26 nm, was successfully produced.
  • The CNN-D facilitated nanometer-spaced planar slip bands, dynamically refining the microstructure.
  • Enhanced strength and ductility were achieved, surpassing CEAs and additively manufactured alloys.

Conclusions:

  • The CNN-D represents a novel microstructural strategy for performance enhancement in eutectic alloys.
  • This approach is particularly effective for compositionally complex alloys utilizing nanoprecipitates.
  • The study offers a new pathway for designing high-performance structural materials.