INVESTIGATION OF THE EFFECTS OF PROCESSING VARIABLES AND FABRICATION TECHNIQUES UPON THE PROPERTIES OF INTERMETALLIC COMPOUNDS. Progress Report No. 3, October 1, 1960-December 31, 1960
Investigations were conducted on the fabrication techniques of cold- pressing and sintering, and plasma flame-spraying for the compounds, NbBe/sub 12/ , Nb/sub 2/Be/sub 17/, and Nb/sub 2/Be/sub 19/. Several processing variables for cold-pressed and sintered compacts of the niobium beryllides were studied in an attempt to achieve properties comparable to those of hot-pressed specimens. These variables were particle size, beryllium content, sintering atmosphere. temperature, time, and specimen size in relation to sintering temperature, density, grain size, and strength. Low strengths for the materials resulted from large grain sizes caused by long sintering times, high sintering temperatures, and low partial pressures of helium. Small particle sizes allowed use of lower sintering temperatures and broader sintering ranges, and resulted in higher densities and better reproducibility for cold-pressed and sintered samples. Hot- pressed billets of the niobium beryllides were upset to 70% in eight minutes at temperatures to 3000 deg F and pressures to 7500 psi in a vacuum hot press. The microstructures of the samples were relatively unchanged, although a small amount of grain growth occurred. All of the samples were annealed for one-half-hour after upsetting to prevent fracture on cooling to room temperature. Of the three compounds upset, Nb/sub 2/Be/sub 19/ had the highest resistance to deformation in vacuum. (auth)
- Research Organization:
- Brush Beryllium Co., Cleveland
- DOE Contract Number:
- AF33(616)-7108
- NSA Number:
- NSA-15-014716
- OSTI ID:
- 4058880
- Report Number(s):
- NP-9873
- Resource Relation:
- Other Information: Technical Report No. 197-229. Orig. Receipt Date: 31-DEC-61
- Country of Publication:
- United States
- Language:
- English
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INVESTIGATION OF THE EFFECTS OF PROCESSING VARIABLES AND FABRICATION TECHNIQUES UPON THE PROPERTIES OF INTERMETALLIC COMPOUNDS. Technical Report No. 185. Progress Report No. 1, April 1, 1960-June 30, 1960
INVESTIGATION OF THE EFFECTS OF PROCESSING VARIABLES AND FABRICATION TECHNIQUES UPON THE PROPERTIES OF INTERMETALLIC COMPOUNDS. Progress Report No. 4, January 1, 1961-March 31, 1961. Technical Report No. 210-229
Related Subjects
ANNEALING
BERYLLIUM
BERYLLIUM ALLOYS
COLD WORKING
COOLING
DEFORMATION
DENSITY
EXPANSION
FABRICATION
FAILURES
GRAIN SIZE
HELIUM
HOT WORKING
INTERMETALLIC COMPOUNDS
METALLOGRAPHY
NIOBIUM ALLOYS
PARTICLES
PRESSURE
SAMPLING
SINTERING
SPUTTERING
STRESSES
TEMPERATURE
VACUUM