High temperature strength of niobium aluminide intermetallics

✍ Scribed by E.P Barth; J.K Tien; S Uejo; S Kambara

• Publisher: Elsevier Science
• Year: 1992
• Tongue: English
• Weight: 308 KB
• Volume: 153
• Category: Article
• ISSN: 0921-5093
• DOI: 10.1016/0921-5093(92)90227-r

✦ Synopsis

A method has been developed and successfully applied to study the high temperature static and time dependent mechanical properties of niobium-aluminum intermetallic compounds. Essentially single phase NbA13 has been cast and analyzed with this technique. These results will be compared with previous data from two-phase alloys containing NbAI 3. Analysis of NbAI3/Nb2A1 mixtures showed the promising nature of the more niobium-rich compositions. Recent results for the highest melting temperature and more promising Nb3A1 compound have borne out this prediction. In addition to static hardness up to 1400 °C, the stress exponent and activation energy for creep have been surmized. Most recently, initial results on Nb2AI further support the progression of enhancing high temperature feasibility with increasing niobium concentration.