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

Journal of Engineering Materials and Technology, Transactions of the ASME, ISSN: 1528-8889, Vol: 117, Issue: 1, Page: 118-126
1995
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  • Citations
    2
    • Citation Indexes
      2

Article Description

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. © 1995 by ASME.

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