The critical resolved shear stress of gamma-prime-strengthened nickel-based superalloys with gamma-prime-volume fractions between 0. 07 and 0. 47

Journal Article · Wed Apr 01 00:00:00 EST 1992 · Acta Metallurgica et Materialia; (United States)

DOI:https://doi.org/10.1016/0956-7151(92)90022-7· OSTI ID:5196671

Schaenzer, S; Nembach, E ^[1]

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1. Muenster, Universitaet, (West Germany)

Gamma-prime-strengthening of four nickel-based superalloys has been investigated theoretically and experimentally. The critical resolved shear stress (CRSS) of under- and of peak-aged single crystals has been measured as a function of the radius and of the volume fraction f of the gamma-prime-particles, f ranged from 0.07 to 0.47. The observed variation of tau(p) contribution of the gamma-prime-particles to the CRSS with f cannot be described by current models of gamma-prime-strengthening. The reason is an apparent increase of the gamma-prime-antiphase boundary energy gamma with f. This variation of gamma with f is tentatively interpreted as being due to the recently reported inhomogeneity of the composition of the gamma-prime-particles: their outer layers are relatively poor in Ni and Al and relatively rich in Co and Cr. If current models of gamma-prime-hardening are modified to allow for the variation of gamma with f, these models lead to satisfactory descriptions of the experimental data. 26 refs.

• OSTI ID: 5196671
• Journal Information: Acta Metallurgica et Materialia; (United States), Vol. 40; ISSN 0956-7151
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
HEAT RESISTING ALLOYS
SHEAR PROPERTIES
NICKEL BASE ALLOYS
CRYSTAL GROWTH
FCC LATTICES
MECHANICAL PROPERTIES
MONOCRYSTALS
NUMERICAL ANALYSIS
PRECIPITATION HARDENING
SOLID SOLUTIONS
ALLOYS
CRYSTAL LATTICES
CRYSTAL STRUCTURE
CRYSTALS
CUBIC LATTICES
DISPERSIONS
HARDENING
HEAT RESISTANT MATERIALS
MATERIALS
MATHEMATICS
MIXTURES
NICKEL ALLOYS
SOLUTIONS
360103* - Metals & Alloys- Mechanical Properties