Microstructure and dynamic strain aging behavior in oxide dispersion strengthened 91Fe-8Ni-1Zr (at%) alloy

Dallin J. Barton, Chaitanya Kale, B. Chad Hornbuckle, Kristopher A. Darling, Kiran Solanki, Gregory B. Thompson

Research output: Contribution to journalArticle

6 Scopus citations

Abstract

Mechanically alloyed 91Fe-8Ni-1Zr (at%) powders were fabricated through high energy ball milling of elemental powder and subsequently consolidated via equal channel angular extrusion (ECAE) at 800 °C and 1000 °C. The resulting microstructure was fine grain with a nano-dispersion of Zr-oxide within the matrix, which was spherical for the 800 °C. ECAE and plate-like (and volumetrically larger) for the 1000 °C ECAE conditions. Atom probe tomography confirmed trace levels of C, N, and Cr impurities within the alloy making it similar to a low-carbon steel. By performing mechanical testing at a quasi-static strain rate (10−3 s−1) and at high strain rate (103 s−1) at room temperature and 473 K, a load drop was noted after yielding. In general, this load drop became more pronounced with increasing strain rate and temperature and has been shown to be a result of dynamic strain aging in the ODS alloy.

Original languageEnglish (US)
Pages (from-to)503-509
Number of pages7
JournalMaterials Science and Engineering A
Volume725
DOIs
StatePublished - May 16 2018

Keywords

  • Atom probe tomography
  • Dynamic strain aging
  • High rate
  • ODS steel

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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