Hot Working of High-Purity Nickel-Niobium Alloys (Preprint)

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Abstract:

The present work deals with the influence of niobium in solid solution on the dynamic recrystallization of pure nickel. High-purity nickel and two model nickel-niobium alloys were deformed to large strains via torsion at temperatures between 800 and 1000C. Niobium additions considerably increased the flow stress, while they lowered the strain-rate sensitivity and increased the apparent activation energy. EBSD of the steady-state microstructures revealed strong grain refinement. Substructure development was favored, whereas thermal twinning was reduced by niobium. More generally, discontinuous recrystallization kinetics were considerably decreased.

Author(s):
Montheillet, F. ; Girard, S. ; Desrayaud, Ch. ; Le Coze, J. ; Semiatin, S. L.
Author Organization(s):
ECOLE NATIONALE SUPERIEURE DES MINES SAINT-ETIENNE (FRANCE)
Descriptive Note:
Conference paper
Supplementary Note:
Prepared in collaboration with Air Force Research Lab., Wright Patterson, OH.
Pagination:
0009

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-ML-WP-TP-206-418
Contract/Grant Number(s):
FA8655-03-M-4061
Monitor Series:
TP-206-418, EOARD
 Subject Terms
Joint Capability Areas:
JCA_5_Command and Control; JCA_5.2.3_Share Knowledge and Situational Awareness; JCA_5.2_Understand; JCA_8_Building Partnerships
Communities of Interest:
Energy and Power Technologies
Descriptor(s):
*NICKEL ALLOYS, *NIOBIUM ALLOYS, THERMAL PROPERTIES, MICROSTRUCTURE, GRAIN STRUCTURES(METALLURGY), TORSION, ACTIVATION ENERGY, HOT WORKING, TWINNING(CRYSTALLOGRAPHY), RECRYSTALLIZATION, STRAIN RATE, FRANCE
Field(s)/Group(s):
Metallurgy and Metallography
Keyword(s):
STINFO(SCIENTIFIC AND TECHNICAL INFORMATION), FOREIGN REPORTS, HOT PURITY, DRX(DYNAMIC RECRYSTALLIZATION)
Report Date:
2006 Apr 01
Creation Date:
2007 Jan 10