Grain boundary properties of Ni-16Cr-9Fe at 360 C
- Univ. of Michigan, Ann Arbor, MI (United States)
Recently, it has been shown that strain localization effects at grain boundaries are important in intergranular cracking of nickel-base alloys and that both cracking propensity and creep properties depend strongly on grain boundary misorientation and its distribution. During high temperature deformation, lattice dislocations interact with grain boundaries creating extrinsic grain boundary dislocations (EGBDs) which may then be dissociated, absorbed or trapped in the boundaries depending on the type and structure of the grain boundaries. The purpose of this work is to quantitatively determine the extent to which the kinetics of dislocation absorption by grain boundaries is related to the high temperature mechanical strength of high-purity Ni-16Cr-9Fe alloys with different grain boundary character distributions. This study focuses on the grain boundary behavior after small plastic deformation at 360 C since a considerably higher local strain, i.e. dislocation density, is observed in the grain boundary regions as compared to the grain interiors.
- DOE Contract Number:
- FG02-85ER45184
- OSTI ID:
- 271640
- Journal Information:
- Scripta Materialia, Vol. 35, Issue 1; Other Information: PBD: 1 Jul 1996
- Country of Publication:
- United States
- Language:
- English
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