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Solid-solution and precipitation softening effects in defect-free faceted Nickel-Iron nanoparticles

Acta Materialia, ISSN: 1359-6454, Vol: 243, Page: 118527
2023
  • 7
    Citations
  • 0
    Usage
  • 10
    Captures
  • 1
    Mentions
  • 11
    Social Media
Metric Options:   Counts1 Year3 Year

Metrics Details

  • Citations
    7
    • Citation Indexes
      7
  • Captures
    10
  • Mentions
    1
    • News Mentions
      1
      • News
        1
  • Social Media
    11
    • Shares, Likes & Comments
      11
      • Facebook
        11

Most Recent News

Researchers from Technion-Israel Institute of Technology Report Details of New Studies and Findings in the Area of Nanoparticles (Solid-solution and Precipitation Softening Effects In Defect-free Faceted Nickel-iron Nanoparticles)

2023 FEB 02 (NewsRx) -- By a News Reporter-Staff News Editor at Middle East Daily -- Investigators publish new report on Nanotechnology - Nanoparticles. According

Article Description

It is well known that metals are strengthened by alloying additions or finely dispersed precipitates of a second phase. Here we show that alloying pristine, defect-free single crystalline nickel nanoparticles with iron results in a counter-intuitive softening due to randomly distributed solute (Fe) atoms and nano-size precipitates of the ordered Ni 3 Fe or Fe-rich phases. The Ni-Fe particles with Fe concentration of 0-50 at.% were synthesized by solid-state dewetting of Ni-Fe bilayer thin films deposited on a sapphire substrate. Ni-27Fe and Ni-50Fe particles exhibited a bimodal size distribution with small (111) and large (100) oriented particles. The solid solution softening was observed in all particles. The precipitation softening was observed in (100) oriented Ni-27Fe particles with uniformly distributed ordered Ni 3 Fe (L1 2 ) precipitates. Fe-rich precipitates were found on the surfaces and near the edges of the highly alloyed Ni-50Fe particles, leading to even greater softening. Molecular dynamic simulations of particle deformation have demonstrated that the softening effect is associated with premature dislocation nucleation at sites with a local stress concentration caused by the randomly distributed solute atoms. This work illustrates how the classical hardening mechanisms operating in bulk materials can be manipulated and even reversed in defect-free single-crystalline metal nanoparticles whose plastic deformation is controlled by dislocation nucleation.

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