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- W1975576400 abstract "In precipitation-strengthened polycrystals, precipitate-free zones (PFZs) often form along grain boundaries. These PFZs lower the yield strength. In this investigation, thin foils of the commercial γ′-strengthened nickel-based superalloy Nimonic PE16 have been strained inside a transmission electron microscope and the relevant dislocation processes in the PFZs and in the γ′-strengthened material next to them have been observed under load. Since the PFZs are only solid solution strengthened, they are softer than the interior of the γ′-strengthened grains. Many different slip systems are activated in the PFZs even at relatively low external stresses. Multiple slip allows for compatible deformation of neighbouring grains. Extensive cross-slip and double cross-slip in the PFZs lead to a high dislocation multiplication rate. Easy creation of dislocations in the PFZs and pile-ups at the border between the PFZs and the γ′-strengthened interior of the grains enhance the propagation of slip across grain boundaries and thus lower the yield strength of the material." @default.
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- W1975576400 date "2003-12-01" @default.
- W1975576400 modified "2023-10-10" @default.
- W1975576400 title "<i>In-situ</i>transmission electron microscopy study of dislocation processes at precipitate-free zones in a<b>γ</b><b>′</b>-strengthened superalloy" @default.
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- W1975576400 doi "https://doi.org/10.1080/14786430310001603445" @default.
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