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Anomalous ion accelerated bulk diffusion of interstitial nitrogen.

Gintautas Abrasonis1, Wolfhard Möller, Xin Xin Ma

  • 1Institute of Ion Beam Physics and Materials Research, Forschungszentrum Rossendorf, PF-510119, 01314 Dresden, Germany. g.abrasonis@fz-rossendorf.de

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Low energy Argon ion bombardment enhances nitrogen diffusion in stainless steel, extending far beyond the ion range. This novel radiation-enhanced diffusion is explained by quasiparticle-enhanced mobility.

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Area of Science:

  • Materials Science
  • Surface Engineering
  • Ion Beam Modification

Background:

  • Ion beam nitriding is a surface modification technique for metals.
  • Understanding nitrogen diffusion is crucial for material properties.
  • Radiation-enhanced diffusion is a known phenomenon in materials under ion bombardment.

Purpose of the Study:

  • To investigate interstitial nitrogen diffusion in ion beam nitrided austenitic stainless steel under low energy Argon ion bombardment.
  • To understand the mechanism behind enhanced nitrogen mobility.
  • To explore the relationship between ion flux and nitrogen depth profile broadening.

Main Methods:

  • Austenitic stainless steel samples were subjected to ion beam nitriding.
  • Samples were then bombarded with low energy (approx. 700 eV) Argon ions (Ar+) at 673 K.
  • Nitrogen depth profiles were analyzed as a function of Ar+ flux.

Main Results:

  • Argon ion bombardment significantly increased nitrogen mobility.
  • Nitrogen diffusion extended to depths far exceeding the ion penetration range.
  • The broadening of the nitrogen depth profile increased with increasing Ar+ flux.

Conclusions:

  • The observed nitrogen diffusion enhancement is not explained by established radiation-enhanced diffusion mechanisms.
  • A novel mechanism involving quasiparticle-enhanced mobility is proposed to explain the findings.
  • This study offers new insights into ion-solid interactions and diffusion in metals.