Abstract
This work reports the uniaxial ratcheting and fatigue behavior of a duplex Mg-Li-Al alloy under the influence of phosphate-buffered solution corrosion. Microstructural observations reveal pitting and filament corrosion defects, which impair the load-bearing capacity of the alloy and cause stress concentration, thus leading to an accelerated accumulation of ratcheting strain and shortened fatigue life under the same nominal loading conditions. Comparing Smith model, Smith-Watson-Topper model, and Paul-Sivaprasad-Dhar model, a ratcheting fatigue life prediction model based on the Broberg damage rule and the Paul-Sivaprasad-Dhar model was proposed, and the model yielded a superior prediction for the studied magnesium alloy.
| Original language | English |
|---|---|
| Pages (from-to) | 1802-1810 |
| Number of pages | 9 |
| Journal | Journal of Materials Engineering and Performance |
| Volume | 25 |
| Issue number | 5 |
| DOIs | |
| State | Published - May 1 2016 |
| Externally published | Yes |
Funding
The project was supported by the National Natural Science Foundation of China (Grant No.51571150, 11572222) and Tianjin Natural Science Foundation (Grant No.14JCYBJC16900).
Keywords
- PBS corrosion
- fatigue life prediction
- magnesium alloy
- ratcheting fatigue
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