Synergisms of grain boundary and {gamma}{prime}-particle strengthening in nickel-base superalloys
- Univ. Muenster (Germany). Inst. fuer Metallforschung
The effect of grain boundaries (GB) on the yield strength {sigma}{sub y} of polycrystals can often be described by the Hall-Petch relation: {sigma}{sub y} = M {tau}{sub c} + k d{sup {minus}1/2} with: M = Taylor factor, {tau}{sub c} = critical resolved shear stress (CRSS) of single crystals of the same material and d = grain size. Introducing particles of a second phase into an originally single phase polycrystalline material does not only alter {tau}{sub c}, but also the Hall-Petch slope k. Mangen and Nembach investigated these synergetic effects of particle- and GB-strengthening for the commercial nickel-base superalloy NIMONIC PE16, which derives its high strength from solid solution hardening of the f.c.c. matrix and from coherent spherical precipitates of the L1{sub 2}-long range ordered {gamma}{prime}-phase. This paper analyzes these synergetic efforts for the nickel-base superalloys.
- OSTI ID:
- 201056
- Journal Information:
- Scripta Materialia, Journal Name: Scripta Materialia Journal Issue: 3 Vol. 34; ISSN 1359-6462; ISSN XZ503X
- Country of Publication:
- United States
- Language:
- English
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