The effect of temperature on the high-strain-rate response of Co-Al-W- base alloys: Experiments and modeling Articles uri icon

publication date

  • March 2022

start page

  • 163154

end page

  • 163163


  • 897

International Standard Serial Number (ISSN)

  • 0925-8388

Electronic International Standard Serial Number (EISSN)

  • 1873-4669


  • Two novels Powder Metallurgy (PM) cobalt-based superalloys with a γ/γ" dual-phase microstructure have
    been subjected to dynamic uniaxial compression tests at temperatures from 25 °C to 850 °C, and a high
    strain rate of 2500 s−1, to investigate the effect of temperature on their high-strain-rate response.
    Compression tests have been performed using a Split Hopkinson Pressure Bar (SHPB), focusing on the
    temperature-dependent anomalies of the flow stress at high temperatures for both alloys. The analysis of
    the experimental results indicates an important strain-rate sensitivity and thermal softening effect with a
    noticeable positive stress peak at high temperatures. Finally, a Johnson-Cook-type constitutive model is
    developed to describe the flow stress as a function of the temperature, including the anomalous positive
    peak temperature. The modified JC model presents a good correlation to predict the behavior of both Cobased superalloys over wide ranges of temperatures through simulating the experimental camping with
    Abaqus. This model offers a potential instrument to simulate and optimize high impact events applications.


  • Chemistry
  • Materials science and engineering


  • cobalt-base superalloys; powder metallurgy; hopkinson-bar; high strain rate; temperature; constitutive model