In this paper, the low-cycle fatigue behavior of two magnesium alloys including AZ91 and AE42 were investigated. The rectangular fatigue samples with dimensions 14 x 5 x 5 mm in gauge section were directly machined from die-cast plate of each alloy (designated F). Some fatigue samples were subjected to solution treatment in argon at 415 deg C for 12 hr (designated T4). Fully-reversed pull-push fatigue tests were performed at room temperature in laboratory air under total strain amplitude control mode using Shimadzu servohydraulic testing machine. All tests were run to final separation of sample, and the corresponding cycling number was defined as low-cycle fatigue life. In addition, the transition fatigue life, NT (the corresponding number of cycles when Delta epsilon e/2 = Delta epsilon p/2), for two alloys with different processing conditions has been also determined. The corresponding values of NT are also given. It can be noted that the transition fatigue life of two alloys is considerably low, which can be attributed to the low ductility of these magnesium alloys. The above fact also means that the fatigue failure of the material tends to be controlled mainly by elastic deformation in the total strain ranges investigated. For the AZ91 alloy, the transition fatigue life significantly increases due to solution treatment. However, the transition fatigue life of the AE42-T4 alloy is slightly lower than that of the die-cast AE42 alloy.
Low-cycle fatigue behavior of two magnesium alloys
Ermüdungsverhalten bei niedrigen Lastspielzahlen von zwei Magnesiumlegierungen
Journal of Materials Science ; 40 , 6 ; 1529-1531
2005
3 Seiten, 3 Bilder, 8 Quellen
Aufsatz (Zeitschrift)
Englisch
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