Evolution of the gamma/gamma' Interface Width in a Commercial Nickel Base Superalloy Studied by 3D Atom Probe (Preprint)

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Abstract:

The compositional width of the gammagamma-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 gammagamma-prime interface width is strongly dependent on temperature in these alloys.

Author(s):
Hwang, J. Y. ; Nag, S. ; Singh, A. R. ; Srinivasan, R. ; Tiley, J. ; Fraser, H. L. ; Banerjee, R.
Author Organization(s):
NORTH TEXAS STATE UNIV DENTON
Descriptive Note:
Journal article preprint
Supplementary Note:
Submitted for publication in Scripta Materialia.
Pagination:
0015

Security Markings

DOCUMENT & CONTEXTUAL SUMMARY

Distribution:
Approved For Public Release
Distribution Statement:
Approved For Public Release; Distribution Is Unlimited.

RECORD

Collection: TR
Identifying Numbers
Report Number(s):
AFRL-RX-WP-TP-2009-4124
Contract/Grant Number(s):
FA8650-08-C-5226
Task Number(s):
20
Project Number(s):
4349
Monitor Series:
TP-2009-4124, AFRL-RX-WP
 Subject Terms
Joint Capability Areas:
JCA_1_Force Support; JCA_1.2_Force Preparation; JCA_5_Command and Control; JCA_1.2.3_Educating; JCA_5.3_Planning; JCA_6_Net Centric; JCA_8_Building Partnerships
Communities of Interest:
Energy and Power Technologies
Descriptor(s):
*PROBES, *NICKEL ALLOYS, *SUPERALLOYS, *NANOSTRUCTURES, THREE DIMENSIONAL, ELECTRODES, ISOTHERMS, DIFFUSION, AGING(MATERIALS), COMPOSITION(PROPERTY), COOLING, INTERFACES, TOMOGRAPHY
Field(s)/Group(s):
Industrial Chemistry and Chemical Processing, Properties of Metals and Alloys, Test Facilities, Equipment and Methods
Keyword(s):
*RENE 88 DT NICKEL ALLOY, *LEAP(LOCAL ELECTRODE ATOM PROBE), *EQUILIBRIUM COMPOSITION, NICKEL BASE SUPERALLOYS, PE62102F, WUAFRLLM114100, WUAFRL43492000
Report Date:
2009 Mar 01
Creation Date:
2009 Aug 12