Magnetic origin of the chemical balance in alloyed Fe-Cr stainless steels: First-principles and Ising model study

Research output: Contribution to journalArticleScientificpeer-review

Researchers

  • E. Airiskallio
  • E. Nurmi
  • I.J. Väyrynen
  • K. Kokko
  • M. Ropo
  • M.P.J. Punkkinen
  • B. Johansson
  • L. Vitos

Research units

  • University of Turku
  • Åbo Akademi University
  • Royal Institute of Technology
  • Uppsala University
  • Aalto University
  • Wigner Research Centre for Physics

Abstract

Iron-chromium is the base material for most of the stainless steel grades. Recently, new insights into the origins of fundamental physical and chemical characteristics of Fe-Cr based alloys have been achieved. Some of the new results are quite unexpected and call for further investigations. The present study focuses on the magnetic contribution in the atomic driving forces related to the chemical composition in Fe-Cr when alloyed with Al, Ti, V, Mn, Co, Ni, and Mo. Using the ab initio exact muffin-tin orbitals method combined with an Ising-type spin model, we demonstrate that the magnetic moment of the solute atoms with the induced changes in the magnetic moments of the host atoms form the main factor in determining the mixing energy and chemical potentials of low-Cr Fe-Cr based alloys. The results obtained in the present work are related to the designing and tuning of the microstructure and corrosion protection of low-Cr steels.

Details

Original languageEnglish
Pages (from-to)135-140
Number of pages6
JournalComputational Materials Science
Volume92
Publication statusPublished - 2014
MoE publication typeA1 Journal article-refereed

    Research areas

  • Al, Chemical potential, Co, Corrosion protection, Cr, Fe, First principles calculation, Ising model, Magnetic moment, Mixing energy, Mn, Mo, Ni, Stainless steel, Ti, V

ID: 15080031