Niobium Silicides for High Temperature Applications

reportActive / Technical Report | Accession Number: ADA262334 | Open PDF

Abstract:

The processing and properties of advanced intermetallics based on aluminide and silicide matrices have been investigated. Vacuum hot press techniques were utilized to produce both monolithic and composite Ni3Al, NiAl, and Nb5Si3. The effects of 10 volume percent TiB2 particulates3 on the fracture toughness of Ni 3 Al and NiAl were determined while in-situ monitoring of the fracture toughness tests was conducted with the aid of a deformation stage mounted inside a scanning electron microscope. The Nb5si3 powders were produced via reaction synthesis followed by hot press consolidation and evaluation of fracture toughness on both the monolithic silicide as well as in-situ Nb5Si3 Nb composites. The Nb particles imparted significant toughening while both crack bridging and ductile phase toughening were observed in the in-situ fracture studies. Significant effects of loading rate on the resulting toughness was observed.

Author(s):
Lewandowski, John J.
Author Organization(s):
CASE WESTERN RESERVE UNIV CLEVELAND OHDEPT OF MATERIALS SCIENCE AND ENGINEERING
Descriptive Note:
Final technical rept. 1 Aug 89-31 Dec 92
Pagination:
0055

Security Markings

DOCUMENT & CONTEXTUAL SUMMARY

Distribution:
Approved For Public Release

RECORD

Collection: TR
Identifying Numbers
Report Number(s):
AFOSR-TR-93-0171
Contract/Grant Number(s):
AFOSR-89-0508
Task Number(s):
A1
Project Number(s):
2306
Monitor Series:
TR-93-0171, AFOSR
 Subject Terms
Joint Capability Areas:
JCA_5_Command and Control; JCA_5.3_Planning; JCA_1_Force Support; JCA_1.2_Force Preparation; JCA_6_Net Centric; JCA_3.2_Engagement; JCA_3_Force Application; JCA_3.2.1_Kinetic Means; JCA_1.2.3_Educating; JCA_6.4.1_Secure Information Exchange; JCA_4.6_Engineering; JCA_1.2.7_Experimentation; JCA_6.3.3_Spectrum Management; JCA_1.2.5_Lessons Learned; JCA_1.3_Human Capital Management; JCA_6.4_Information Assurance; JCA_1.3.2_Personnel Management; JCA_6.1_Information Transport; JCA_6.2.3_Core Enterprise Services; JCA_1.2.6_Concepts; JCA_6.3_Net Management
Modernization Areas:
Hypersonics
Communities of Interest:
Advanced Electronics
Descriptor(s):
*SYNTHESIS(CHEMISTRY), *INTERMETALLIC COMPOUNDS, TEST AND EVALUATION, SCANNING ELECTRON MICROSCOPES, PHYSICAL PROPERTIES, POWDERS, PROCESSING, COMPOSITE MATERIALS, HIGH TEMPERATURE, DEFORMATION, CRACKS, HOT PRESSING, TOUGHNESS, FRACTURE(MECHANICS), PARTICLES, DUCTILITY, SILICIDES, REINFORCING MATERIALS, ALUMINIDES
Field(s)/Group(s):
Laminates and Composite Materials
Keyword(s):
*NIOBIUM SILICIDES, PE61102F, NICKEL ALUMINIDES
Report Date:
1993 Jan 25