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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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The structure of a crystalline solid, whether a metal or not, is best described by considering its simplest repeating unit, which is referred to as its unit cell. The unit cell consists of lattice points that represent the locations of atoms or ions. The entire structure then consists of this unit cell repeating in three dimensions. The three different types of unit cells present in the cubic lattice are illustrated in Figure 1.
Types of Unit Cells
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Ionic Crystal Structures02:42

Ionic Crystal Structures

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Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
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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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Determining the Mechanical Strength of Ultra-Fine-Grained Metals
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Constrained minimal-interface structures in polycrystalline copper with extremely fine grains.

X Y Li1, Z H Jin2,3, X Zhou2

  • 1Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China. xyli@imr.ac.cn lu@imr.ac.cn.

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|November 13, 2020
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Summary
This summary is machine-generated.

Researchers discovered a new, stable metastable state in ultra-fine grained copper, forming Schwarz crystal structures. This unique structure prevents grain coarsening and enhances material strength near theoretical limits.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Metallurgy

Background:

  • Polycrystalline metals are thermodynamically unstable due to grain boundaries.
  • Heating causes grain coarsening, while small grains can form metastable amorphous states.

Purpose of the Study:

  • To investigate the behavior of extremely fine-grained polycrystalline pure copper.
  • To identify novel metastable states and their properties.

Main Methods:

  • Experimental techniques and molecular dynamics simulations.
  • Reducing grain sizes to nanometers through straining.
  • Analyzing grain boundary evolution and structural stability.

Main Results:

  • Discovered a new metastable state in nanometer-grained copper.
  • Grain boundaries evolved into 3D minimal-interface structures within twin boundary networks.
  • This structure, termed a Schwarz crystal, is stable against grain coarsening near the melting point.
  • Achieved material strength near theoretical values.

Conclusions:

  • Ultra-fine grained copper can form a stable Schwarz crystal structure.
  • This structure offers enhanced thermal stability and superior mechanical strength.