ANISOTROPY OF THE CRITICAL RESOLVED SHEAR-STRESS OF A GAMMA'(47 VOL.PERCENT)-HARDENED NICKEL-BASE SUPERALLOY AND ITS CONSTITUENT GAMMA-SINGLE-PHASES AND GAMMA'-SINGLE-PHASES
A. Nitz et E. Nembach, ANISOTROPY OF THE CRITICAL RESOLVED SHEAR-STRESS OF A GAMMA'(47 VOL.PERCENT)-HARDENED NICKEL-BASE SUPERALLOY AND ITS CONSTITUENT GAMMA-SINGLE-PHASES AND GAMMA'-SINGLE-PHASES, Materials science & engineering. A, Structural materials: properties, microstructure and processing, 234, 1997, pp. 684-686
Single crystals of the commercial nickel-base superalloy NIMONIC 105 w
ith four different orientations have been compression tested in the te
mperature range 600-1150 K. NIMONIC 105 is strengthened by fine, coher
ent, shearable, homogeneously distributed precipitates of the L1(2)-lo
ng-range ordered gamma'-phase (47 vol.%). The same investigations were
undertaken for single crystals of the two constituent phases: L1(2)-o
rdered, intermetallic single-phase gamma' and disordered single-phase
f.c.c. gamma-matrix. Their compositions were those of the two equilibr
ium phases of NIMONIC 105. The CRSS of NIMONIC 105 and of the gamma'-p
hase were anisotropic in the whole temperature range. The CRSS of the
gamma-matrix was isotropic. The interpretation of the anisotropy of NI
MONIC 105 follows that of single-phase L1(2)-ordered gamma'. (C) 1997
Elsevier Science S.A.