Effect of molybdenum substitution on the yield stress anomaly in Fe3Al-based alloys

✍ Scribed by Y. Nishino; T. Tanahashi

• Publisher: Elsevier Science
• Year: 2004
• Tongue: English
• Weight: 101 KB
• Volume: 387-389
• Category: Article
• ISSN: 0921-5093
• DOI: 10.1016/j.msea.2004.05.077

✦ Synopsis

We report on the phase stability and high-temperature strength of (Fe 1-x Mo x ) 3 Al with 0 ≤ x ≤ 0.20. As the D0 3 -B2 transition temperature T c increases by the Mo substitution, the yield stress peak substantially shifts to higher temperatures and can be found at about 900 and 970 K for x = 0.05 and 0.10, respectively. The strain rate sensitivity is near zero in the temperature range where the plateau with a rather low yield stress appears, but rises sharply around the peak temperature, reaching a maximum at the very vicinity of T c . The close correlation between the peak temperature and the transition temperature strongly supports that the loss of D0 3 order is responsible for the occurrence of the yield stress anomaly.