|
Abstract:
The compositional width of the gamma/gamma-prime interface for primary and secondary gamma-prime precipitates in the commercial nickel base superalloy, Rene 88 DT, has been characterized at sub-nanometer resolution using local electrode atom probe (LEAP) tomography. On formation during continuous cooling, the primary gamma-prime precipitates exhibit a very sharp interface while the secondary gamma-prime precipitates exhibit a substantially more diffuse interface. Interestingly, on subsequent isothermal aging at 760 degrees C, the interface width increases for the primary gamma-prime precipitates while it decreases for the secondary gamma-prime precipitates, reaching a near equilibrium composition width for both types of interfaces after aging for 200 hours. These results imply the gamma/gamma-prime interface width is strongly dependent on temperature in these alloys.
| Limitations: |
 APPROVED FOR PUBLIC RELEASE |
| Description: |
Journal article preprint |
| Pages: |
15 |
| Report Date: |
Mar-2009 |
| Contract Number: |
FA8650-08-C-5226 FA865008C5226 |
| Report Number: |
A096205 |
|
|
|
|
|
Keywords relating to this report:
Email This Abstract
