TY - JOUR A1 - Vattré, A. A1 - Fedelich, Bernard T1 - On the relationship between anisotropic yield strength and internal stresses in single crystal superalloys JF - Mechanics of materials N2 - The present work focuses on the cubic slip phenomenon in single crystal superalloys with a high fraction of γ' precipitates at high temperature. The macroscopically apparent cubic slip mechanism is known to significantly reduce the tensile and creep strength of <1 1 1> oriented specimens. However, recent results obtained by 3D dislocation dynamics (Vattré et al., 2009) suggest a new interpretation of the so-called pseudo-cubic slip related to the nature of the dislocation network formation at the interfaces. These results are taken into account in a micromechanical model to improve the estimation of the strain hardening anisotropy. In accordance with the discrete simulations, it is shown that a key role is played by the combination of the activated octahedral slip systems as a function of the crystal orientation. In the <1 1 1> case, the contribution of the activated systems to kinematical hardening compensate, whereas strain hardening remains high for the <0 0 1> case. The experimental dependence of plastic flow on the orientation is also explained at the dislocation-scale mechanisms. Results are presented for the alloy CMSX-4 in several orientations. KW - Nickel-base superalloys KW - High-temperature deformation KW - Micromechanical modeling KW - Strengthening mechanisms PY - 2011 DO - https://doi.org/10.1016/j.mechmat.2011.07.007 SN - 0167-6636 SN - 1872-7743 VL - 43 IS - 12 SP - 930 EP - 951 PB - Elsevier CY - Amsterdam AN - OPUS4-24927 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -