The critical resolved shear stress of a superalloy as a combination of those of its {gamma} matrix and {gamma}{prime} precipitates

Journal Article · Sun Mar 01 04:00:00 EST 1998 · Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science

DOI:https://doi.org/10.1007/s11661-998-0271-2· OSTI ID:616436

Nitz, A; Nembach, E ^[1]

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1. Univ. of Muenster (Germany)

The critical resolved shear stress (CRSS), {tau}{sub 0}, of peak-aged single crystals of the {gamma}{prime}-hardened commercial nickel-base superalloy NIMONIC 105 has been measured as a function of temperature T and orientation [hk{ell}] of the compression axis. The same measurements have been carried out for the two constituent phases of NIMONIC 105: for the single-phase {gamma} matrix and for the single-phase L1{sub 2}-long-range ordered {gamma}{prime} phase. The value of T ranged from 283 to 1,150 K, and the following orientations were studied: [001], [011], [{bar 1}11], and [{bar 1}23]. The specimens were compression tested. The {tau}{sub 0} values of NIMONIC 105 and of the {gamma}{prime} phase anisotropic; the anisotropy of NIMONIC 105 is similar to that of the {gamma}{prime} phase, but less pronounced. The {tau}{sub 0} of the {gamma} phase is isotropic. The {tau}{sub 0} values of the {gamma} and of the {gamma}{prime} phase vary with T, whereas the {tau}{sub 0} of NIMONIC 105 is nearly independent of T for 400 K {le} T {le} 1,000 K. A model is presented that relates the function {tau}{sub 0} ([h, k, {ell}], T) of NIMONIC 105 to the analogous functions of its constituent {gamma} and {gamma}{prime} phase.

• Sponsoring Organization: USDOE
• OSTI ID: 616436
• Journal Information: Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science, Journal Name: Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science Journal Issue: 3 Vol. 29; ISSN MMTAEB; ISSN 1073-5623
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
GRAIN ORIENTATION
MATHEMATICAL MODELS
NIMONIC 105
PRECIPITATION HARDENING
SCREW DISLOCATIONS
SHEAR PROPERTIES
TEMPERATURE DEPENDENCE