Ti-Al-V ternary phase stability at elevated temperatures

Journal Article · Fri Feb 14 23:00:00 EST 1992 · Scripta Metallurgica; (United States)

DOI:https://doi.org/10.1016/0956-716X(92)90307-Z· OSTI ID:5502423

Chaudhury, P K; Rack, H J ^[1]

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1. Dept. of Mechanical Engineering, Clemson Univ., Clemson, SC (US)

Ternary additions of the beta isomorphous elements, Nb, V, Mo, and Ta, have long been known to improve the ambient temperature ductility and fracture toughness of {alpha} 2 (Ti{sub 3}Al) and {gamma} (TiAl) intermetallic alloys. In the former the increase has been related to the stabilization of the ductile {beta} phase, while the latter enhancement has been related to changes in tetragonality, unit cell volume, twin density and/or electronic structure. Control of the mechanical properties of ternary and more complex {alpha} 2 (Ti{sub 3}Al) and {gamma} (TiAl) intermetallic alloys will require optimization of their prior thermomechanical history. Accordingly, this paper presents the preliminary results of a re-examination of the Ti-Al-V system, emphasizing alloys in the {alpha} 2 + {gamma}, {alpha} 2 + {beta}, {beta} + {gamma} and {alpha} 2 + {beta} + {gamma} phase fields. The principal experimental procedure utilized was in-situ high temperature x-ray diffraction (HTXRD).

• OSTI ID: 5502423
• Journal Information: Scripta Metallurgica; (United States), Journal Name: Scripta Metallurgica; (United States) Vol. 26:4; ISSN 0036-9748; ISSN SCRMB
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360102* -- Metals & Alloys-- Structure & Phase Studies
360103 -- Metals & Alloys-- Mechanical Properties
360104 -- Metals & Alloys-- Physical Properties
ALLOYS
ALUMINIUM ALLOYS
AMBIENT TEMPERATURE
CHEMICAL COMPOSITION
COHERENT SCATTERING
DENSITY
DIFFRACTION
DUCTILITY
ELECTRONIC STRUCTURE
FABRICATION
HEAT RESISTANT MATERIALS
HEAT RESISTING ALLOYS
HEAT TREATMENTS
INTERMETALLIC COMPOUNDS
MATERIALS
MATERIALS WORKING
MECHANICAL PROPERTIES
MOLYBDENUM ADDITIONS
MOLYBDENUM ALLOYS
NIOBIUM ADDITIONS
NIOBIUM ALLOYS
PHASE STABILITY
PHASE TRANSFORMATIONS
PHYSICAL PROPERTIES
SCATTERING
STABILITY
TANTALUM ADDITIONS
TANTALUM ALLOYS
TENSILE PROPERTIES
THERMOMECHANICAL TREATMENTS
TITANIUM ALLOYS
TITANIUM BASE ALLOYS
VANADIUM ADDITIONS
VANADIUM ALLOYS
X-RAY DIFFRACTION