Phase relations in Ti-Al-Nb alloys at 1200 degrees C

Journal Article · Sun Mar 15 04:00:00 EST 1992 · Scripta Metallurgica; (United States)

OSTI ID:5389142

Suryanarayana, C ^[1]; Lee, D S ^[2]

---

1. Inst. for Materials and Advanced Processes, Univ. of Idaho, Moscow, ID (US)
2. Metals and Ceramics Div., Materials Directorate, Wright Lab., Wright-Patterson Air Force Base, OH (US)

This paper reports that titanium aluminides based on both Ti{sub 3}Al ({alpha}{sub 2}) and TiAl ({gamma}) have received considerable attention during the past few years as potential candidates for high temperature structural applications in the aerospace industry. This has been due to the attractive combination of properties such as low density, high specific strength, elevated temperature strength and modulus retention, excellent creep resistance and high resistance to oxidation. A serious handicap in using these alloys has been their vary poor ductility. Refinement of grain size, addition of ternary and quaternary alloying elements (e.g., Nb, Mn and Ta) and microstructural refinements through either innovative heat treatments or by production of nanometer-sized grains through mechanical alloying or magnetron sputtering methods have been explored to increase the ductility. Amongst these approaches, addition of alloying elements, especially of niobium, has proven extremely beneficial. Thus, there have been several investigations in recent years on the constitution, microstructure and properties of ternary Ti-Al-Nb alloys.

• OSTI ID: 5389142
• Journal Information: Scripta Metallurgica; (United States), Journal Name: Scripta Metallurgica; (United States) Vol. 26:6; ISSN 0036-9748; ISSN SCRMB
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360102* -- Metals & Alloys-- Structure & Phase Studies
AEROSPACE INDUSTRY
AGE HARDENING
ALLOY SYSTEMS
ALLOYS
ALUMINIUM ALLOYS
BINARY ALLOY SYSTEMS
CHEMICAL COMPOSITION
CORROSION RESISTANCE
DIAGRAMS
DUCTILITY
FABRICATION
HARDENING
HEAT RESISTANT MATERIALS
HEAT RESISTING ALLOYS
HEAT TREATMENTS
INDUSTRY
MATERIALS
MATERIALS TESTING
MATERIALS WORKING
MECHANICAL PROPERTIES
NIOBIUM ALLOYS
PHASE DIAGRAMS
PHASE STUDIES
SPUTTERING
TEMPERATURE RANGE
TEMPERATURE RANGE 1000-4000 K
TENSILE PROPERTIES
TERNARY ALLOY SYSTEMS
TESTING
THERMOMECHANICAL TREATMENTS
TITANIUM ALLOYS
TITANIUM BASE ALLOYS
YOUNG MODULUS