Corrosion fatigue of die-cast and extruded magnesium alloys

A. Eliezer, E. M. Gutman, E. Abramov, Ya Unigovski

Research output: Contribution to journalArticlepeer-review

83 Scopus citations

Abstract

To study the fatigue life of die-cast and extruded AZ91D, AM50 and AZ31 magnesium alloys, corrosion fatigue tests were carried out using a rotating beam type fatigue machine. Corrosive environment (3.5% NaCl) significantly decreases fatigue life of alloys, especially for extruded alloys. The fatigue data at high stresses were analyzed using fitting equations. Extruded alloys show a higher sensitivity to the action of NaCl solution in comparison with die-cast alloys; however, their corrosion fatigue life is longer than that of die-cast alloys. Corrosion fatigue behavior of Mg alloys correlates with their mechanochemical behavior. The latter was studied by the polarization measurements of the dissolution rate of strained alloys. TEM observations confirmed that the maximums on the curves of Mg dissolution rate dependence on the strain in NaCl solution appeared at the work-hardening stages due to the creation and destruction of dislocation pile-ups.

Original languageEnglish
Pages (from-to)179-186
Number of pages8
JournalJournal of Light Metals
Volume1
Issue number3
DOIs
StatePublished - 1 Aug 2001

Keywords

  • Corrosion fatigue
  • Dislocation pile-ups
  • Magnesium alloys
  • Work-hardening

ASJC Scopus subject areas

  • Materials Science (all)

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