HIGH-TEMPERATURE COMPRESSION AND TENSILE TESTS OF GAMMA'-SINGLE AND GAMMA'(50-PERCENT) GAMMA(50-PERCENT)-SINGLE CRYSTALS WITH [100]-ORIENTATION, [123]-ORIENTATION, [011]-ORIENTATION AND [111]-ORIENTATION/

The critical resolved shear stress (CRSS) of (i) the gamma'-phase (L1( 2)-long-range ordered) of the gamma'-strengthened nickel-base superall oy NIMONIC 105; (ii) the latter alloy itself; and (iii) its gamma-matr ix (disordered) have been measured in compression and tensile tests at temperatures ranging from 283 to 1150 K. The orientations of the sing le crystals were: (001), (123), (011) and (111). NIMONIC 105 contains 47 vol.% gamma'-precipitates. The CRSSs of the gamma'-phase and of NIM ONIC 105 are anisotropic and differ for compression and tensile tests. Both anisotropies and asymmetries are similar, but those of the gamma '-phase are much more pronounced. A model is presented which relates t he CRSS of NIMONIC 105 to those of its constituent gamma'- and gamma-p hases. (C) 1997 Elsevier Science S.A.