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TECHNICAL PAPERS

Crack Growth Rate Behavior of a Titanium-Aluminide Alloy During Isothermal and Nonisothermal Conditions

[+] Author and Article Information
J. J. Pernot, T. Nicholas

Materials Directorate, Wright Laboratory, Wright-Patterson AFB, OH 45433

S. Mall

Department of Aeronautics and Astronautics, Air Force Institute of Technology, Wright-Patterson AFB, OH 45433

J. Eng. Mater. Technol 117(1), 118-126 (Jan 01, 1995) (9 pages) doi:10.1115/1.2804362 History: Received December 17, 1992; Online November 27, 2007

Abstract

Observations of isothermal fatigue, isothermal fatigue with superimposed load hold times, and thermomechanical fatigue (TMF) crack growth rate behavior of Ti-24Al-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.

Copyright © 1995 by The American Society of Mechanical Engineers
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