High-temperature compression and tensile tests of γ′- and γ′ (50%)/γ (50%)-single crystals with 〈001〉-, 〈123〉-, 〈011〉- and 〈111〉- orientations

The critical resolved shear stress (CRSS) of (i) the γ′-phase (L12-long-range ordered) of the γ′-strengthened nickel-base superalloy NIMONIC 105; (ii) the latter alloy itself; and (iii) its γ-matrix (disordered) have been measured in compression and tensile tests at temperatures ranging from 283 to 1150 K. The orientations of the single crystals were: 〈001〉, 〈123〉, 〈011〉, and 〈111〉. NIMONIC 105 contains 47 vol.% γ′-precipitates. The CRSSs of the γ′-phase and of NIMONIC 105 are anisotropic and differ for compression and tensile tests. Both anisotropies and asymmetries are similar, but those of the γ′-phase are much more pronounced. A model is presented which relates the CRSS of NIMONIC 105 to those of its constituent γ′- and γ-phases.