Rhenium (Re) is the slowest‐diffusing element in nickel‐based single‐crystal (SC) superalloy, and its diffusion coefficient has deep influence on the research of homogenization. A model of diffusion of Re during homogenization is established in this work. Based on the model and the data in this experiment, the diffusion coefficient of Re (D_Re) is 6.67 × 10⁻³ μm² s⁻¹ at 1300 °C, 7.99 × 10⁻³ μm² s⁻¹ at 1330 °C, and 1.86 × 10⁻² μm² s⁻¹ at 1340 °C. The experimental data show that the D_Re in SC structure is smaller than it in polycrystalline structure, which was measured by diffusion couple system. Also, the law of change of D_Re during 1300–1340 °C does not conform the Arrhenius equation because of the undissolved γ′ phase.

中文翻译：

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新型镍基单晶高温合金均质过程中of扩散系数的变化

hen（Re）是镍基单晶（SC）高温合金中扩散最慢的元素，其扩散系数对均质化研究具有深远的影响。在这项工作中建立了Re在均质化过程中扩散的模型。基于所述模型和在该实验中的数据中，Re（的扩散系数d_重）为6.67×10 ^-3 微米² 小号^-1在1300℃，7.99×10 ^-3 微米² 小号^-1在1330℃下，和1.86×10 ^-2 微米² 小号^-1在1340℃。实验数据表明，D _Re通过扩散偶合系统测量，SC结构中的Cs小于多晶结构中的Sc。另外，由于未溶解的γ'相，在1300-1340°C期间D _Re的变化规律与Arrhenius方程不符。