Anisotropic yield behavior of lotus-type porous iron: Measurements and micromechanical mean-field analysis

M. Tane, T. Ichitsubo, S. K. Hyun, H. Nakajima

Research output: Contribution to journalArticlepeer-review

34 Citations (Scopus)

Abstract

Anisotropic yield behavior of lotus-type porous iron fabricated using the continuous-zone-melting method in a pressurized nitrogen and hydrogen atmosphere has been investigated. The 0.2% offset strength (compressive yield stress) in the loading direction parallel to the longitudinal axis of pores decreases linearly with increasing porosity, while the perpendicular strength decreases steeply. The strength versus porosity curves can be expressed using a well-known power law formula. In addition, the 0.2% offset strength of lotus iron prepared in a nitrogen and hydrogen atmosphere is found to be larger than that of lotus iron prepared in a hydrogen and helium atmosphere, which is attributed to the solid solution hardening by the solute nitrogen. Furthermore, we compare the experimental results to calculations obtained by means of the extended Qiu-Weng's mean-field method, and the comparison suggests that local stresses deviated from the average stress are dominant in the macroscopic yield behavior of lotus metals.

Original languageEnglish
Pages (from-to)135-143
Number of pages9
JournalJournal of Materials Research
Volume20
Issue number1
DOIs
Publication statusPublished - 2005 Jan

ASJC Scopus subject areas

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

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