STRUCTURE AND PROPERTIES OF NIOBIUM-ALUMINUM ALLOYS
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 kg/sq mm, and the electrical resistance was 220 to 300 micro-ohms/cm. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 14, 1961
- Accession Number
- AD0261803
Entities
People
- V.v. Baron
- Ye. M. Savitskiy
Organizations
- National Air and Space Intelligence Center