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Title of article :
Anisotropic strain hardening following load reversal during high-temperature creep testing of superalloy single crystals
Author/Authors :
Carroll، نويسنده , , M.C. and Serin، نويسنده , , K. and Eggeler، نويسنده , , G.، نويسنده ,
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Abstract :
A critical examination and qualitative evaluation of anisotropic creep behavior in nickel-based superalloy CMSX-4 single crystals is provided with respect to previously established models describing pure shear creep of specimens deformed at high temperatures. Using double-shear creep deformation samples, a complete reversal of applied creep stress results in a large increase in creep rate in the opposite direction. During forward creep, dislocation networks build up that are trapped in γ channels along γ/γ′ interfaces. The sense reversal in applied stress effectively releases the dislocation networks, resulting in a large jump in measured creep rates.
Keywords :
Ni-based superalloys , High-temperature creep , single crystals , Transmission electron microscopy
Journal title :
Astroparticle Physics
Link To Document :