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This manuscript investigated the possibility for CALPHAD (calculation of phase diagram) approach to predict the local phase transformation accompanied by compositional transition on the superlattice stacking fault in the γ′ precipitates in multi-component superalloys. The method is basically parallel tangent construction using the concept of the defect phases in the system of γ and γ′ phases to approximate the stacking fault. Because the important issue for the strengthening by the local phase transformation is whether the local transformed phase is ordered or disordered, the ordering was judged by the size of the stacking fault energy to form the defect phase from γ′ precipitates. In addition, since the solute partitioning ratio between defect phase and γ′ precipitates is also significant to consider the local phase transformation, predicted ratio is verified using the experimental results in the previous reports. In the case of SISF (superlattice intrinsic stacking fault), Co-base superalloys tend to form ordered defect phase, but Co-Ni-base superalloys tend to form disordered defect phase. Formability of ordered and disordered defect phase in Ni-base superalloys is calculated to be competitive each other. Predicted solute partitioning rate almost agrees with experimental one expect for W and Nb in multi-component superalloys. This discrepancy could originate from the accuracy of the physical properties of Ti and Nb in the calculation. In the case of SESF (superlattice extrinsic stacking fault), all considered alloys of Ni-base superalloys is predicted to have ordered defect phase, judged by stacking fault energy, however, predicted solute partitioning ratio is totally different from the experimental ones. This issue could originate form inaccurate physical properties of Ti and Ta in the multi-component system.

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キーワード: Superalloys, Stacking fault, Solute partition, Local phase transformation, Suzuki effect

刊行年月日: 2024-09-06

出版者: Elsevier BV

掲載誌:

• Next Materials (ISSN: 29498228) vol. 7 100363

研究助成金:

原稿種別: 出版者版 (Version of record)

MDR DOI:

公開URL: https://doi.org/10.1016/j.nxmate.2024.100363

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更新時刻: 2024-09-09 16:30:26 +0900

MDRでの公開時刻: 2024-09-09 16:30:26 +0900