Elemental segregation to antiphase boundaries in a crept CoNi-based single crystal superalloy
| Autor: | Dierk Raabe, Erdmann Spiecker, Malte Lenz, Steffen Neumeier, Surendra Kumar Makineni, Baptiste Gault |
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| Rok vydání: | 2018 |
| Předmět: |
010302 applied physics
Materials science Condensed matter physics Mechanical Engineering Superlattice Metals and Alloys 02 engineering and technology 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Planar Mechanics of Materials Phase (matter) 0103 physical sciences Partial dislocations Solute diffusion General Materials Science 0210 nano-technology Stacking fault Single crystal superalloy |
| Zdroj: | Scripta Materialia. 157:62-66 |
| ISSN: | 1359-6462 |
| DOI: | 10.1016/j.scriptamat.2018.07.042 |
| Popis: | We report on the full three-dimensional compositional partitioning among the features of a planar imperfection comprising a superlattice intrinsic stacking fault (SISF) with its leading and trailing partials, as well as the antiphase boundary (APB) in the wake of the trailing partial formed in the L12-ordered γ′ phase of a CoNi-based single crystal superalloy. The partial dislocations and the APB are found to be Cr/Co rich relative to the surrounding γ′ and richer in W/Ta/Ti compared to the γ matrix phase. Solute diffusion mechanisms are derived from the compositional gradients in the vicinity of the imperfection. |
| Databáze: | OpenAIRE |
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