CRSS anisotropy and tension compression asymmetry of a commercial superalloy
- Univ. Muenster (Germany). Inst. fuer Metallforschung
The critical resolved shear stresses (CRSS) of the {gamma}-strengthened nickel-based superalloy NIMO-NIC 105 and of its two constituent phases--disordered f.c.c. {gamma}-matrix and L1{sub 2}-long-range ordered {gamma}-phase--have been measured in tension and compression. The single crystals had the following orientations: [001], [011], [{bar 1}11], and [{bar 1}23]; the deformation temperatures T ranged from 283 to 1150 K. The dislocation processes in NIMONIC 105 have been studied by transmission electron microscopy and slip trace analyses. The CRSS {tau}{sub o} of single-phase {gamma}-crystals showed the abnormalities which have been observed for many other L1{sub 2}-long-range ordered materials: (1) positive slope {partial_derivative}{tau}{sub o}/{partial_derivative}T, (2) anisotropy, (3) tension/compression (t/c) asymmetry, {tau}{sub o} of two-phase NIMONIC 105 has anisotropies and (t/c) asymmetries which are similar to those of single-phase {gamma}{prime}, but they are less pronounced, {tau}{sub o} of NIMONIC 105 is, however, nearly independent of T for 400 K {le} T {le} 1,000 K. Copley and Kear`s dynamic model has been adapted to relate {tau}{sub o} of two-phase NIMONIC 105 to {tau}{sub o} of its constituent single-phase {gamma}- and {gamma}{prime}-phase.
- OSTI ID:
- 651105
- Journal Information:
- Acta Materialia, Vol. 46, Issue 13; Other Information: PBD: 10 Aug 1998
- Country of Publication:
- United States
- Language:
- English
Similar Records
Anisotropy of the critical resolved shear stress of a superalloy containing 6 vol.% L1{sub 2}-ordered {gamma}{prime}-precipitates
Synergisms of grain boundary and {gamma}{prime}-particle strengthening in nickel-base superalloys