Abstract
The sheet metal of a new Ni-based superalloy was prepared by Electron Beam Physical Vapor Deposition (EBPVD) technology. Microhardness tester and transmission electron microscope were used to study the change of room temperature microhardness, coarsening behavior and morphological change of γ′ precipitates. Results show that γ′ precipitates coarsened by the step growth mechanism change from approximately round shape to regular order cubic one with the increase of aging temperature. Growth of γ′ precipitates proceeds by Ostwald ripening controlled by volume diffusion of solute atoms. The activation energy for growth are evaluated as 266.18 kJ·mol-1 for this alloy. The decrease in room temperature microhardness and the softening of alloy can be attributed to the growth of γ′ precipitates in the alloy.
| Original language | English |
|---|---|
| Pages (from-to) | 38-41 |
| Number of pages | 4 |
| Journal | Journal of Aeronautical Materials |
| Volume | 26 |
| Issue number | 6 |
| State | Published - Dec 2006 |
Keywords
- Coarsening
- Electron beam physical vapor deposition
- Gamma prime precipitate
- Nickel-based superalloy
- Ostwald ripening
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