Abstract
Solid-solid diffusion couples assembled with selected α (fcc), β (bcc) and (α + β) two-phase alloys in the Cu-Ni-Zn system were investigated at 775° for the development of diffusion structures and diffusion paths. The microstructures developed in the diffusion zones were studied metallographically and the concentration profiles were determined by SEM-EDAX techniques. The interdiffusion fluxes of the components were calculated directly from the concentration profiles. A diffusion couple with a terminal alloys whose compositions were selected close to the α/(α + β) phase boundary on the Cu-Ni-Zn ternary isotherm developed a complex (α + β) two-phase layer. On the other hand, a multiphase couple assembled with two (α + β) terminal alloys exhibited separation of the phases with the development of adjacent single phase layers of α and β phases. Zero-flux planes for Cu were identified in the diffusion zones of the couples. The diffusion structures for the various couples are described and discussed on the basis of experimental diffusion paths.
Published Version
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