Table 3.
Parameters in Equations (64)–(70) and their values for 6061-T6 Al alloy at ambient conditions [2,22].
| Parameter | Value | Unit | Definition |
|---|---|---|---|
| α het | 7.4 × 1013 | 1/m2 | heterogeneous nucleation coefficient |
| α ann | 0.5 | annihilation coefficient | |
| α dis | 0.015 | network trapping coefficient | |
| α p | 0.02 | precipitate trapping coefficient | |
| d p | 1.0 × 10−8 | m | precipitate size |
| λ p | 7.0 × 10−8 | m | precipitate spacing |
| d | 4.0 × 10−5 | m | mean grain size |
| m | 1.0 | shape constant | |
| f HEL | 1.0 | initial fraction of mobile dislocations | |
| δ | 3.5 × 105 | 1/m | multiplication coefficient |
| τ a | 106 | MPa | lower-bound shear stress for heterogeneous nucleation |
| τ b | 920 | MPa | upper-bound shear stress for heterogeneous nucleation |