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Processing of Bulk Nanocrystalline Metals at the US Army Research Laboratory
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Engineering interface structures and thermal stabilities via SPD processing in bulk nanostructured metals.

Shijian Zheng1, John S Carpenter2, Rodney J McCabe2

  • 1Center for Integrated Nanotechnologies, MPA-CINT, Los Alamos National Laboratory, Los Alamos, NM 87545, USA.

Scientific Reports
|February 28, 2014
PubMed
Summary
This summary is machine-generated.

Researchers developed thermally stable nanostructured metals by engineering bimetal interfaces. Adjusting the severe plastic deformation (SPD) pathway creates robust interfaces, enhancing material strength and thermal stability for engineering applications.

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Area of Science:

  • Materials Science
  • Metallurgy
  • Nanotechnology

Background:

  • Nanostructured metals offer high strength due to abundant interfaces.
  • However, these interfaces limit thermal stability, creating a strength-thermal stability tradeoff.
  • Improving interface thermal stability is key to overcoming this limitation.

Purpose of the Study:

  • To investigate the influence of severe plastic deformation (SPD) processing pathways on the atomic structure and thermal stability of bimetal interfaces.
  • To explore methods for enhancing the thermal stability of macroscale nanomaterials for engineering applications.

Main Methods:

  • Utilized severe plastic deformation (SPD) processing with varied pathways.
  • Fabricated macroscale bimetal nanomaterials.
  • Characterized the atomic structure and thermal stability of the resulting interfaces.

Main Results:

  • Successfully altered the atomic structures of bimetal interfaces by modifying the SPD pathway.
  • Formed two distinct interface types with regular atomic structures.
  • Achieved excellent thermal stability for both interface types, stable up to over 50% of the melting temperature of a constituent metal.
  • Demonstrated significantly superior thermal stability in one interface type compared to the other.

Conclusions:

  • The atomic-scale engineering of bimetal interfaces via SPD processing offers a novel route to enhance material robustness.
  • It is possible to control and optimize the thermal stability of macroscale nanomaterials by tuning interface structures.
  • This approach enables the development of a new class of materials that are simultaneously strong and thermally stable.