Structure and Properties of Melt Grown Nb-Nb2C Composites.

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Abstract:

The report consists of two preprints. One preprint describes a process for growing eutectic and hypereutectic Nb-Nb2C composites by an electron beam floating zone freezing technique. The structure is characterized as a function of carbon content and growth rate. The conditions for interface stability in the Nb-Nb2C system are compared to present theoretical models. The second preprint discusses sources of banding in composite growth and pays particular attention to banding that results from nonuniformity in the feed rod. This mechanism is important in composite growth techniques employing zone melting and may be avoided by zone levelling prior to composite growth. Author

Author(s):
David, Stan A. ; Brody, Harold D.
Author Organization(s):
PITTSBURGH UNIV PA DEPT OF METALLURGICAL AND MATERIALS ENGINEERING
Descriptive Note:
Technical rept.,
Pagination:
0041

Security Markings

DOCUMENT & CONTEXTUAL SUMMARY

Distribution:
Approved For Public Release

RECORD

Collection: TR
Identifying Numbers
Report Number(s):
MME-HDB-73-R1
Contract/Grant Number(s):
N00014-67-A-0402-0003
Project Number(s):
NR-031-729
 Subject Terms
Communities of Interest:
No COI(s) Identified
Descriptor(s):
(*COMPOSITE MATERIALS, *EUTECTICS), ZONE MELTING, NIOBIUM, NIOBIUM COMPOUNDS, CARBIDES, FIBER METALLURGY, FREEZING, MICROSTRUCTURE, INTERFACES
Field(s)/Group(s):
Laminates and Composite Materials, Properties of Metals and Alloys
Keyword(s):
*EUTECTIC COMPOSITES, NIOBIUM CARBIDES, NIOBIUM MATRIX COMPOSITES
Report Date:
1973 Sep 01