|About this Abstract
||2021 TMS Annual Meeting & Exhibition
||Magnesium Technology 2021
||Role of Temperature and Pre-strain in Fatigue Strength of WE43-T5 Magnesium Alloy
||Marko Knezevic, Saeede Ghorbanpour, Brandon A McWilliams
|On-Site Speaker (Planned)
This work investigates the effects of test temperature and sample pre-straining on the high cycle fatigue behavior of a magnesium alloy, WE43. Fatigue strength is found to deteriorate with environmental temperature from room to 100℃. The decline is associated with softening of the thermally activated deformation mechanisms in the material with temperature. In contrast to the samples pre-strained in tension, fatigue strength improves for the samples pre-strained in compression. The peak improvements of over 2x is determined for the samples pre-compressed to 6% strain. Significantly, the alloy sufficiently pre-strained in compression begins to exhibit the endurance limit. The interesting characteristics of the alloy behavior in fatigue upon pre-straining are rationalized and discussed in terms of the microstructural evolution as well as the underlying deformation mechanisms of slip and twinning causing hardening and forming localizations.