Fracture and fatigue of cast gamma TiAl based aluminides

Book · Sat Dec 30 23:00:00 EST 1995

OSTI ID:225159

Bowen, P; Rogers, N J; James, A W ^[1]

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1. Univ. of Birmingham (United Kingdom)

This paper considers the crack growth resistance of cast and heat-treated gamma TiAl based aluminides under both monotonic and cyclic loading. Attention is focused primarily on the crack growth resistance of fatigue pre-cracked test pieces, and the influence of test temperature, microstructure and lamellar colony orientation is highlighted. Particular emphasis throughout this paper is placed on fully lamellar and near (fully) lamellar microstructures. The importance of aligned lamellar colonies and randomized lamellar colonies on fracture toughness and fatigue crack growth resistance is illustrated. Finally, the effects of the size of the lamellar colonies on fracture toughness and its interpretation is addressed, and especially with respect to the amount of material sampled within the process zone ahead of the sharp fatigue pre-crack tip.

• OSTI ID: 225159
• Report Number(s): CONF-950201--; ISBN 0-87339-304-X
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
36 MATERIALS SCIENCE
AEROSPACE INDUSTRY
ALUMINIUM ALLOYS
CRACK PROPAGATION
CRACKS
ENVIRONMENT
EXPERIMENTAL DATA
FATIGUE
FRACTOGRAPHY
FRACTURE MECHANICS
FRACTURE PROPERTIES
GRAIN SIZE
INTERMETALLIC COMPOUNDS
LAMELLAE
MANGANESE ALLOYS
MATERIALS
MICROSTRUCTURE
NIOBIUM ALLOYS
ORIENTATION
STRESS INTENSITY FACTORS
TEMPERATURE DEPENDENCE
TITANIUM ALLOYS