Journal
INTERNATIONAL JOURNAL OF FATIGUE
Volume 150, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ijfatigue.2021.106302
Keywords
Fatigue crack initiation; Slip bands; Magnesium alloy; Dislocation intensity zone; (c plus a) dislocation
Funding
- National Natural Science Foundation of China [12072212, 11832007]
- National Key Research and Development Program of China [2018YFE0307104]
- Sichuan University AMP
- ZiGong government Support Program [2019-CDZG-4]
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The study on rare earth-containing magnesium (RE-Mg) alloy reveals that dislocation activities and the formation of dislocation intensity zones (DIZs) play a role in enhancing high cycle fatigue resistance.
The underlying low-stress cyclic deformation and associated dislocation activities within the slip bands (SBs) in a rare earth-containing magnesium (RE-Mg) alloy were characterized. The results show that basal slip is the predominant deformation at grain scale, but the gliding of (c + a) dislocation is also visible near grain boundaries to accommodate localized inhomogeneous deformation. The interaction between basal (a) dislocations and nonbasal (c + a) dislocations results in the nucleation of dislocation intensity zones (DIZs), which subsequently hinders the development of the basal slip bands. Therefore, it is suggested that the DIZs contributed to the enhanced high cycle fatigue resistance of RE-Mg alloys.
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