Abstract
Total strain range controlled low cycle fatigue (LCF) experiments were conducted at 750℃ to investigate the effects of the duplex and fully lamellar microstructure on fatigue behavior and life of a TiAl alloy, and the total strain range-life equation was employed to predict LCF life of the alloy. The results show that the mean stress produced at hysteresis loop of TiAl alloy with DP is less that of TiAl alloy with FL at the same temperature and applied strain. The total strain range-life equation is able to predict the fatigue life of the alloy, and the predicted life is located between ±2 scatter band of the experimental life. In addition, the fatigue source of TiAl alloy with DP is located near center of the specimen while that of TiAl alloy with FL is located on subsurface of the specimen, and the failure mechanisms are obviously different between the two types of the TiAl alloy.
| Original language | English |
|---|---|
| Pages (from-to) | 77-82 |
| Number of pages | 6 |
| Journal | Journal of Aeronautical Materials |
| Volume | 37 |
| Issue number | 5 |
| DOIs | |
| State | Published - 1 Oct 2017 |
| Externally published | Yes |
Keywords
- Failure mechanism
- Hysteresis loop
- Life prediction
- Low cycle fatigue (LCF)
- TiAl alloy
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