Effects of humidity and temperature on the fatigue behaviour of an extruded AZ61 magnesium alloy

Zainuddin Sajuri, Y. Miyashita, Y. Mutoh

Research output: Contribution to journalArticle

38 Citations (Scopus)

Abstract

Load-controlled fatigue tests were performed at 20 and 50 °C using two relative humidity levels of 55 and 80% to characterize the influence of humidity and temperature on the fatigue behaviour of an extruded AZ61 magnesium alloy. Fatigue tests were also conducted at 150 °C. No significant variation in fatigue properties was noticed with respect to temperature over the range from 20 to 50 °C for both the humidity levels. Fatigue limits in the range 140-150 MPa were observed for relative humidity of 55%. Fatigue strength decreased significantly with increase in temperature to 150 °C. Further, a significant reduction in fatigue strength with a fatigue limit of ∼110 MPa was observed with increase in relative humidity to 80% at 20 and 50 °C. The crack initiation and propagation remained transgranular under all test conditions. The fatigue fracture at low stress amplitudes and high relative humidity of 80% results from the formation of corrosion pits at the surface and their growth to a critical size for fatigue-crack initiation and propagation. The observed reduction in fatigue strength at high humidity is ascribed to the effects associated with fatigue-environment interaction.

Original languageEnglish
Pages (from-to)373-379
Number of pages7
JournalFatigue and Fracture of Engineering Materials and Structures
Volume28
Issue number4
DOIs
Publication statusPublished - Apr 2005
Externally publishedYes

Fingerprint

Magnesium alloys
Atmospheric humidity
Fatigue of materials
Temperature
Crack initiation
Crack propagation
Corrosion
Fatigue strength

Keywords

  • Corrosion fatigue
  • Corrosion pit
  • Fatigue
  • Humidity
  • Magnesium alloy
  • Temperature

ASJC Scopus subject areas

  • Mechanical Engineering
  • Materials Science(all)

Cite this

Effects of humidity and temperature on the fatigue behaviour of an extruded AZ61 magnesium alloy. / Sajuri, Zainuddin; Miyashita, Y.; Mutoh, Y.

In: Fatigue and Fracture of Engineering Materials and Structures, Vol. 28, No. 4, 04.2005, p. 373-379.

Research output: Contribution to journalArticle

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