Abstract
Laser rapid solidification experiments have been performed on Cu-26.6wt% Mn, Cu-27.3wt% Mn and Cu-31.4wt% Mn alloys to investigate their microstructures evolution with growth rate under ultra-high temperature gradient, respectively. The experimental results showed that the microstructure of Cu-26.6wt% Mn alloy changed from cellular to dendrite, super-fine cellular and segregation-free solid with the increase of growth rate; no dendrite growth appeared in the whole growth rate range for Cu-27.3wt% Mn and Cu-31.4wt% Mn alloy, whereas fully grew in the form of cellular. The critical rates of absolute stability for Cu-31.4wt%Mn, Cu-27.3wt%Mn and Cu-26.6wt% Mn alloys were 113.3, 212.6 and 260.5mm/s, respectively, which is reasonable agreement with that of the predicted By M-S theory.
| Original language | English |
|---|---|
| Pages (from-to) | 1-5+13 |
| Journal | Hangkong Cailiao Xuebao/Journal of Aeronautical Materials |
| Volume | 21 |
| Issue number | 2 |
| State | Published - Jun 2001 |
| Externally published | Yes |
Keywords
- Absolute stability
- Elongated cell
- Laser rapid solidification
- Ultra-high temperature gradient