HREM study of the matrix-pirecipitate interface structure and deformation mechanisms in a cobalt based superalloyReport as inadecuate




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Abstract : The structure of a Co-Ni-Cr-Nb superalloy has been studied using high resolution electron microscopy. An ordered hexagonal phase precipitates during annealing at temperatures from 700 to 850 °C. The compact planes and compact directions of the fcc matrix and precipitates are mutually parallel. The matrix precipitate interface is constituted by 3 sets of edge dislocations in a triangular distribution. The dislocation strain field has been calculated using the formalism of the Somigliana dislocations. Traction experiments were performed at room temperature and deformed samples were observed using HREM. The deformation mechanisms and gliding dislocations have been identified.





Author: J.-M. Penisson

Source: https://hal.archives-ouvertes.fr/



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