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- Title
Effects of humidity and temperature on the fatigue behaviour of an extruded AZ61 magnesium alloy.
- Authors
Sajuri, Z. B.; Miyashita, Y.; Mutoh, Y.
- 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.
- Subjects
MATERIAL fatigue; HUMIDITY; TEMPERATURE; MAGNESIUM alloys; STRAINS &; stresses (Mechanics); CORROSION &; anti-corrosives
- Publication
Fatigue & Fracture of Engineering Materials & Structures, 2005, Vol 28, Issue 4, p373
- ISSN
8756-758X
- Publication type
Article
- DOI
10.1111/j.1460-2695.2005.00775.x