| 摘 要： | The precipitation of the lamellar-shaped M_(23)C_6 carbide within the dendritic matrix of a cobalt-base superalloy during thermal exposure at 1000 °C has been investigated. Such a precipitation is not commonly observed in cobalt-base superalloys. It is found that M_(23)C_6 particles nucleate preferentially at stacking faults(SFs) in the dendritic matrix and grow along the SFs to develop a lamellar character. Additionally, a Cr depletion zone is observed in the vicinity of the lamellar M_(23)C_6 carbide, which strongly supports the presence of Suzuki segregation.
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