Microstructural instability in the alloy Ti-25Al-10Nb-3V-1Mo

Journal Article · Sat Mar 31 23:00:00 EST 1990 · Scripta Metallurgica; (United States)

DOI:https://doi.org/10.1016/0956-716X(90)90211-X· OSTI ID:5660045

Ward, C H ^[1]; Williams, J C ^[2]; Thompson, A W ^[3]

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1. Wright Research and Development Center, WRDC/MLLS, Wright Patterson AFB, OH (US)
2. Engineering Materials Technology Lab., General Electric Aircraft Engines, Cincinnati, OH (US)
3. Dept. of Metallurgical Engineering and Materials Science, Carnegie Mellon Univ., Pittsburgh, PA (US)

Titanium aluminide alloys based on the intermediate phase Ti{sub 3}Al, referred to as {alpha}{sub 2} (DO{sub 19} structure), have been a focus of researchers for the past twenty years because of their potential as a low density alternative to Ni-base superalloys. Over time, various {beta}-stabilizing additions have been added to the {alpha}{sub 2} phase in an effort to improve mechanical properties; past efforts have concentrated on room temperature ductility in particular. Virtually all alloys of current interest contain enough alloying additions beside Al that additional phases are present. In many cases, one of these is an ordered derivative of the {beta}-phase with a B2 (CsCl) structure. This B2 phase is sometimes referred to as {beta}{sub 2} or {beta}{sub 0} but here the authors refer to it as B2. Metastable B2 phase decomposition processes have been shown to be very complex. (3-7). This paper reports the observation of an autorecrystallization, or in-situ coarsening, reaction in an {alpha}{sub 2} + {beta} titanium aluminide alloy, Ti-25Al-10Nb-3V-1Mo (atomic percent).

• OSTI ID: 5660045
• Journal Information: Scripta Metallurgica; (United States), Journal Name: Scripta Metallurgica; (United States) Vol. 24:4; 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
BORON ADDITIONS
BORON ALLOYS
CHEMICAL REACTION KINETICS
CRYSTAL STRUCTURE
ENERGY LEVELS
EXCITED STATES
GRAIN BOUNDARIES
HEAT RESISTANT MATERIALS
HEAT RESISTING ALLOYS
INTERMETALLIC COMPOUNDS
KINETICS
MATERIALS
MECHANICAL PROPERTIES
METASTABLE STATES
MICROSTRUCTURE
MOLYBDENUM ADDITIONS
MOLYBDENUM ALLOYS
OPTIMIZATION
PHASE STUDIES
REACTION KINETICS
TITANIUM ALLOYS
TITANIUM BASE ALLOYS
VANADIUM ADDITIONS
VANADIUM ALLOYS