Zero-flux planes and flux reversals in the Cu-Ni-Zn system at 775/sup 0/C. Part II. Multiphase diffusion
Multiphase diffusion was investigated in the Cu-Ni-Zn system at 775/sup 0/C with solid-solid diffusion couples assembled with ..cap alpha..(fcc), ..beta..(bcc) and ..gamma..(cubic) alloys for the development of zero-flux planes (ZFP) for the individual components. ZFP's were identified in adjacent phase layers in several diffusion couples and the ZFP compositions were found to correspond to intersection points of diffusion paths and isoactivity lines drawn through the terminal alloy compositions on the Cu-Ni-Zn isotherm. In addition, discontinuous flux reversals for the components were also identified at ..beta../..cap alpha.. and ..gamma../BETA interfaces in several couples with or without the development of ZFP's in the individual phase layers. A discontinuous flux reversal for a component was observed at a planar interface, when the activity of the component at the interface coincided with its activity in one of the terminal alloys of the couple. The transition from planar to nonplanar morphologies reflected a mismatch in the interface velocities calculated from the interdiffusion fluxes and concentrations of each of the components on either side of the interface.
- Research Organization:
- Purdue Univ., Lafayette, IN (USA)
- DOE Contract Number:
- AC02-81ER10814
- OSTI ID:
- 5947655
- Report Number(s):
- DOE/ER/10814-6; ON: DE83015391
- Country of Publication:
- United States
- Language:
- English
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