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Changes in the Diffusion Coefficient of Rhenium in a New Type of Nickel‐Based Single‐Crystal Superalloy during Homogenization
Author(s) -
Li Yiling,
Jia Zhihong,
Tang Wei,
Liang Xiangfeng,
Xu Weitai,
Zhao Yutao
Publication year - 2020
Publication title -
advanced engineering materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.938
H-Index - 114
eISSN - 1527-2648
pISSN - 1438-1656
DOI - 10.1002/adem.201901151
Subject(s) - superalloy , rhenium , materials science , homogenization (climate) , crystallite , arrhenius equation , nickel , thermodynamics , effective diffusion coefficient , single crystal , diffusion , metallurgy , microstructure , analytical chemistry (journal) , crystallography , activation energy , chemistry , physics , medicine , biodiversity , ecology , radiology , magnetic resonance imaging , biology , chromatography
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 μm 2 s −1 at 1300 °C, 7.99 × 10 −3 μm 2 s −1 at 1330 °C, and 1.86 × 10 −2 μm 2 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.