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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...
16.5K

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A high-temperature nanostructured Cu-Ta-Li alloy with complexion-stabilized precipitates.

B C Hornbuckle1, J A Smeltzer2, S Sharma3

  • 1Army Research Directorate, DEVCOM, Army Research Laboratory, Aberdeen Proving Ground, MD, USA.

Science (New York, N.Y.)
|March 27, 2025
PubMed
Summary
This summary is machine-generated.

We developed a novel copper alloy (Cu-3Ta-0.5Li) that maintains stability at near-melting temperatures. This breakthrough offers enhanced thermal stability, strength, and creep resistance for high-temperature applications.

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Area of Science:

  • Materials Science
  • Metallurgy
  • Nanotechnology

Background:

  • Developing high-temperature copper alloys is crucial for demanding applications like heat exchangers.
  • Existing copper alloys often suffer from coarsening and creep at elevated temperatures.

Purpose of the Study:

  • To engineer a thermally stable bulk nanocrystalline copper alloy for near-melting temperature operation.
  • To investigate the role of lithium and tantalum in stabilizing nanoscale precipitates in copper.

Main Methods:

  • Fabrication of a bulk nanocrystalline Cu-3Ta-0.5Li alloy.
  • Microstructural analysis to characterize precipitate morphology and phase boundaries.
  • Evaluation of thermal stability, strength, and creep resistance at high temperatures.

Main Results:

  • The Cu-3Ta-0.5Li alloy exhibits exceptional thermal stability with minimal coarsening and creep.
  • Coherent, ordered L12 Cu3Li precipitates stabilized by a tantalum-rich bilayer phase boundary were observed.
  • Addition of lithium transformed spherical precipitates to cuboidal, enhancing alloy properties.

Conclusions:

  • The developed alloy demonstrates superior performance at near-melting temperatures due to complexion-stabilized nanoscale precipitates.
  • This alloy design offers a promising pathway for next-generation copper alloys in high-temperature applications.
  • The findings provide valuable insights for designing advanced materials for extreme environments.