Abstract
The thresholds of short fatigue cracks for aluminum-lithium alloys 2090 and 2090+Ce are quantitatively evaluated. The essential reason resulting in stronger short crack effect has been ascertained. Influence of cerium on the threshold of short fatigue cracks for aluminum-lithium alloy 2090 was investigated. The results show that, by adding Ce into this alloy, ΔKi and ΔKCl·th are increased. The influence mechanism of Ce on the threshold of short fatigue crack for alloy 2090 is explored from the bound energy, T1 phase, the energy of anti-phase boundary, the energy of super-lattice intrinsic stacking fault and the electron bonds. By adding Ce into alloy 2090, the bound energy of Cu atom in this alloy is increased; the effect of thinning and dispersing T1 phase is obtained; the effect of increasing the energy of anti-phase boundary and decreasing the energy of super-lattice intrinsic stacking fault for δ phase can be achieved.
| Original language | English |
|---|---|
| Pages (from-to) | 32-37 |
| Number of pages | 6 |
| Journal | Rare Metals |
| Volume | 20 |
| Issue number | 1 |
| State | Published - Jan 2001 |
Keywords
- Aluminum-lithium alloy
- Bound energy
- Ce
- Fault energy
- Short fatigue crack