Crack growth rate behavior of a titanium-aluminide alloy during isothermal and nonisothermal conditions

Journal Article · Sat Dec 31 23:00:00 EST 1994 · Journal of Engineering Materials and Technology; (United States)

DOI:https://doi.org/10.1115/1.2804362· OSTI ID:6549519

Pernot, J J; Nicholas, T ^[1]; Mall, S ^[2]

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1. Wright Lab., Wright-Patterson AFB, OH (United States). Materials Directorate
2. Air Force Inst. of Technology, Wright-Patterson AFB, OH (United States). Dept. of Aeronautics and Astronautics

Observations of isothermal fatigue, isothermal fatigue with superimposed load hold times, and thermomechanical fatigue (TMF) crack growth rate behavior of Ti-24-Al-11Nb are presented and compared with results from previous studies on titanium and nickel-base superalloys. Elevated-temperature crack growth mechanisms in this alloy, which involve fatigue, oxidation and creep, and the influence of frequency, temperature, and hold-time are discussed. These mechanisms are used to interpret the observations of TMF crack growth. The limitations of current crack growth rate models based on the linear-elastic fracture mechanics parameter, K, are addressed.

• OSTI ID: 6549519
• Journal Information: Journal of Engineering Materials and Technology; (United States), Journal Name: Journal of Engineering Materials and Technology; (United States) Vol. 117:1; ISSN 0094-4289; ISSN JEMTA8
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360103* -- Metals & Alloys-- Mechanical Properties
ALLOYS
ALUMINIUM ALLOYS
COMPARATIVE EVALUATIONS
CRACK PROPAGATION
DATA
EVALUATION
EXPERIMENTAL DATA
FATIGUE
HEAT RESISTANT MATERIALS
HEAT RESISTING ALLOYS
INFORMATION
MATERIALS
MECHANICAL PROPERTIES
NIOBIUM ALLOYS
NUMERICAL DATA
THERMAL FATIGUE
TITANIUM ALLOYS
TITANIUM BASE ALLOYS