Synchrotron Sub‐μ X‐ray Tomography of Kirkendall Porosity in a Diffusion Couple of Nickel‐Base Superalloy and Nickel after Annealing at 1250 °C,Advanced Engineering Materials

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Synchrotron Sub‐μ X‐ray Tomography of Kirkendall Porosity in a Diffusion Couple of Nickel‐Base Superalloy and Nickel after Annealing at 1250 °C
Advanced Engineering Materials ( IF 3.4 ) Pub Date : 2020-12-17 , DOI: 10.1002/adem.202001220
Alexander Epishin ₁ , Bettina Camin ₁ , Lennart Hansen ₁ , Anton Chyrkin ₂ , Gert Nolze ₃

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Kirkendall porosity that forms during interdiffusion in a diffusion couple of nickel‐base superalloy CMSX‐10 with pure nickel is investigated. The diffusion experiments are conducted at a temperature of 1250 °C, where the strengthening γ′‐phase is partially dissolved. The porosity is studied by X‐ray sub‐μ tomography with a spatial resolution of about 0.35³ μm³ at the European Synchrotron Radiation Facility (ESRF) in Grenoble, France. It is found that depending on the distance from the interface the Kirkendall pores take different shapes: octahedral, rounded pyramidal, drop shaped, dendritic, pear shaped, and joint shapes. Such a variety of pore morphologies indicates a complex multistage process of porosity nucleation and growth under vacancy supersaturation of different degrees. The experimental findings are interpreted on the basis of the results of diffusion modeling. It is shown that the kinetics of porosity growth is essentially influenced by the dissolution of the γ′‐phase.

中文翻译：

镍基高温合金和镍在1250°C退火后的扩散对中的Kirkendall孔隙的同步辐射X射线断层扫描

研究了镍基高温合金CMSX-10与纯镍的扩散对中相互扩散过程中形成的Kirkendall孔隙。扩散实验在1250°C的温度下进行，其中强化γ'相部分溶解。孔隙率是通过X射线子μ断层摄影术研究具有约0.35的空间分辨率³ 微米³在法国格勒诺布尔的欧洲同步加速器辐射设施（ESRF）上工作。已发现，根据距界面的距离，柯肯德尔孔洞具有不同的形状：八面体，圆形金字塔形，水滴形，树状，梨形和关节形。如此多种多样的孔隙形态表明了在不同程度的空位过饱和下，孔隙成核和生长的复杂的多阶段过程。实验结果根据扩散建模的结果进行解释。结果表明，孔隙生长的动力学基本上受γ′相溶解的影响。

更新日期：2020-12-17

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