Environmental effect on fatigue properties of die-cast magnesium alloys

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Abstract

In order to study the environmental effect on fatigue properties of die-cast magnesium alloys, several fatigue tests were performed for AM50HP and AZ91HP in ambient air, vacuum, engine oil, deionized water and 3.5% NaCl solution. It is found that the S-N curves are steeper in corrosive environment and AM50HP shows a higher sensitivity to the action of 3.5% NaCl solution than AZ91HP. Both alloys do not have endurance limits in 3.5% NaCl solution, whereas endurance limits could be detected in ambient air, which are about 90MPa and 100MPa for AZ91HP and AM50HP respectively. It is also found that FCP rate is substantially increased in corrosion media: the presence of oxygen causes the production of oxide film on the fresh surfaces made during the cyclic loading and the oxide film would restrict the deformation of the matrix beneath the hard film and promote hydrogen embrittlement in the wet condition.

Original languageEnglish
Title of host publicationMechanical Engineering and Materials
Subtitle of host publicationICMEM 2012
Pages548-553
Number of pages6
DOIs
StatePublished - 2012
Event2012 International Conference on Mechanical Engineering and Materials, ICMEM 2012 - Melbourne, VIC, Australia
Duration: 15 Jan 201216 Jan 2012

Publication series

NameApplied Mechanics and Materials
Volume152-154
ISSN (Print)1660-9336
ISSN (Electronic)1662-7482

Conference

Conference2012 International Conference on Mechanical Engineering and Materials, ICMEM 2012
Country/TerritoryAustralia
CityMelbourne, VIC
Period15/01/1216/01/12

Keywords

  • Corrosion fatigue
  • Die-cast
  • Environment
  • Fatigue crack propagation
  • Magnesium alloy

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