Fracture toughness of gamma-base titanium aluminides

Journal Article · Tue Jan 31 23:00:00 EST 1995 · Metallurgical Transactions, A (Physical Metallurgy and Materials Science); (United States)

DOI:https://doi.org/10.1007/BF02664668· OSTI ID:6608882

Gnanamoorthy, R ^[1]; Mutoh, Y ^[2]; Masahashi, N; Mizuhara, Y ^[3]

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1. Tohoku Univ., Sendai (Japan). Inst. for Materials Research
2. Nagaoka Univ. of Technology (Japan)
3. Nippon Steel Corp., Kawasaki (Japan)

Effects of microstructures, alloying additions, and processing routes on the room- and elevated-temperature fracture toughnesses of gamma-base titanium aluminides were investigated. Microstructure was found to have a strong influence on the fracture toughness both at room and elevated temperatures. Lamellar microstructure materials exhibited high fracture toughness compared with duplex microstructure materials, which in turn possessed high fracture toughness compared with the equiaxed microstructure materials. Alloying additions affected the fracture toughness at elevated temperatures significantly. The addition of chromium improved the low-temperature fracture toughness (below 800 C), while the addition of niobium increase the fracture toughness above 800 C. Grain size refining, as a result of isothermal forging after casting and heat treatment, has less influence on the fracture toughness.

• OSTI ID: 6608882
• Journal Information: Metallurgical Transactions, A (Physical Metallurgy and Materials Science); (United States), Journal Name: Metallurgical Transactions, A (Physical Metallurgy and Materials Science); (United States) Vol. 26:2; ISSN 0360-2133; ISSN MTTABN
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360102 -- Metals & Alloys-- Structure & Phase Studies
360103* -- Metals & Alloys-- Mechanical Properties
ALLOYS
ALUMINIUM ALLOYS
CHROMIUM
DATA
ELEMENTS
EXPERIMENTAL DATA
FRACTURE PROPERTIES
GRAIN REFINEMENT
HEAT RESISTANT MATERIALS
HEAT RESISTING ALLOYS
INFORMATION
INTERMETALLIC COMPOUNDS
MATERIALS
MECHANICAL PROPERTIES
METALLURGICAL EFFECTS
METALS
MICROSTRUCTURE
NIOBIUM
NUMERICAL DATA
TITANIUM ALLOYS
TRANSITION ELEMENTS