Accession Number:

AD0261803

Title:

STRUCTURE AND PROPERTIES OF NIOBIUM-ALUMINUM ALLOYS

Descriptive Note:

Corporate Author:

FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO

Personal Author(s):

Report Date:

1961-07-14

Pagination or Media Count:

1.0

Abstract:

Microscopic, thermic, and X-ray techniques, and measurement of the hardness and electrical resistance of cast and tempered alloys were used to construct a phase diagram of the alloys of Nb andAl. Three compounds, Nb3Al, Nb2Al, and NbAl3 were detected. Nb3Al and Nb2Al were formed at 2,120 10 C and 1,890 10 C, respectively, in accordance with a peritectic reaction, NbAl3 crystallized from the fusion at 1,660 10 C. The solubility of Al in Nb at 2,190 C was about 6 wt-, and it decreased to 4.5 at room temperature. The eutectic between the compounds Nb2Al and NbAl3 formed at 1,1630 10 C. NbAl3 and Al formed a fusible eutectic 565 C which was displaced toward Al 1 wt- Nb. The hardness and the electrical resistance of Nb increased with an increase in Al. In the region of the compounds from 8 to 45 wt- the hardness was 450 to 500 kgsq mm, and the electrical resistance was 220 to 300 micro-ohmscm. Author

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Distribution Statement:

APPROVED FOR PUBLIC RELEASE