Ordering and decomposition of the β phase in melt-spun TiAl1 − x Vx alloys

✍ Scribed by G. Shao; P. Tsakiropoulos; A.P. Miodownik

• Publisher: Elsevier Science
• Year: 1996
• Tongue: English
• Weight: 842 KB
• Volume: 216
• Category: Article
• ISSN: 0921-5093
• DOI: 10.1016/0921-5093(96)10379-8

✦ Synopsis

Ordering and decomposition of the [3 phase in melt-spun and aged TiAI~_.,.Vx ribbons were studied using calcuIated phase equilibria and electron microscopy. The phase transformation paths were dramatically changed by rapid quenching from the melt. In the melt-spun ribbons, "~ nucleation in the [3/B2 matrix and c~--, c~ a ordering were completely suppressed. The [3 ~ B2 ordering temperature Tc was modelled. The results support the predicted decrease in Tc with substitution of A1 with V. The effective [3--+ B2 ordering temperature was lowered by high cooling rates. The formation of the co phase in the melt-spun ribbons and of co and c~_ phases in the aged ribbons is also discussed.