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/
A. Nitz et E. Nembach, 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/, Materials science & engineering. A, Structural materials: properties, microstructure and processing, 240, 1997, pp. 164-168
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.