Role of twinning in the optimization of the grain boundary character distribution
- LLNL
The grain boundary character distribution (GBCD) is a microstructural property that describes the proportions of "special" and "random" boundaries as defined by the coincident site lattice model. Recently, there has been increased attention on determination of the GBCD and manipulation of the relative fractions in the microstructure through thermomechanical processing in order to improve material's properties like corrosion and creep resistance. Most of the "optimization" treatments reported in the literature have been performed on fee materials with relatively low stacking fault energies and have resulted in microstructures with high fractions of Σ3, Σ9, and Σ27 boundaries. It could be interpreted that annealing twins are solely required to improve the GBCD. However, in order to optimize the properties, it appears imperative that the formation of annealing twins disrupt the connectivity of the random boundary network, thus implying that Σ3n reactions and resultant triple lines are critical. Experiments to modify the GBCD of oxygen-free electronic Cu and Inconel 600 through thermomechanical processing are presented and discussed in light of observations of the deformed and recrystallized microstructures.
- Research Organization:
- Lawrence Livermore National Laboratory (LLNL), Livermore, CA
- Sponsoring Organization:
- USDOE Office of Defense Programs (DP)
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 6136
- Report Number(s):
- UCRL-JC-131664; YN0100000; 99-ERD-001; ON: DE00006136
- Country of Publication:
- United States
- Language:
- English
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