In-situ observations of crack initiation and growth at notches in cast Ti-48Al-2Cr-2Nb

Journal Article · Sun Dec 01 00:00:00 EST 1996 · Scripta Materialia

DOI:https://doi.org/10.1016/1359-6462(96)00294-1· OSTI ID:413265

Pollock, T M; Muraleedharan, K ^[1]; Mumm, D R; Martin, P L ^[2]

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1. Carnegie Mellon Univ., Pittsburgh, PA (United States). Dept. of Materials Science and Engineering
2. Rockwell International Science Center, Thousand Oaks, CA (United States)

Gamma titanium aluminide alloys have recently received a great deal of attention due to their demonstrated potential for application in aircraft engines. Although a number of studies have been conducted on the fracture behavior of these alloys under conditions where relatively long pre-existing cracks are present, there is little information on the early stages of crack initiation and growth. The objective of the study reported here was to observe the initial development of cracks at the scale of the microstructure. To confine the process of interest to well-defined regions, notched specimens were utilized. Observations regarding the initiation, growth and the influence of environment on failure are discussed.

• OSTI ID: 413265
• Journal Information: Scripta Materialia, Vol. 35, Issue 11; Other Information: PBD: 1 Dec 1996
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
33 ADVANCED PROPULSION SYSTEMS
TITANIUM ALLOYS
FRACTURE PROPERTIES
ALUMINIUM ALLOYS
CHROMIUM ALLOYS
NIOBIUM ALLOYS
AIRCRAFT
ENGINES
SAMPLE PREPARATION
CHEMICAL COMPOSITION
CASTING
HEAT TREATMENTS
HOT PRESSING
STRESSES
STRAINS
CRACKS
CRACK PROPAGATION
ENVIRONMENT