High-temperature creep-induced site occupation evolution in the γ′ lattice in a Ru-bearing Ni-based superalloy
High-temperature creep-induced site occupation evolution in the γ′ lattice in a Ru-bearing Ni-based superalloy
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DOI：
10.1080/21663831.2023.2254910
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发表时间：
2023-09
影响因子：
8.3
通讯作者：
Yunsong Zhao;N. Li;Li Wang;Junyang He;Weihong Liu;Min Song
中科院分区：
文献类型：
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作者：
Yunsong Zhao;N. Li;Li Wang;Junyang He;Weihong Liu;Min Song
By using state-of-the-art characterisation techniques including atom probe tomography and atomic resolved elemental mapping, we successfully probed the site occupation evolution associated with composition change in γ′, during 1100°C creep of a fourth generation Ru-bearing Ni-based superalloy. It is quantified that, W and Ru maintain unchanged site preference after creep rupture, while interestingly, the rest elements especially Co, Ta and Re show a weakened preference at both α- and β-sites in the γ′ lattice. This indicates the overall reduced γ′ ordering degree and thus the possible decrease in planar fault energies, which further facilitates dislocation shearing in γ′. GRAPHICAL ABSTRACT IMPACT STATEMENT Associated with the tremendous mass transfer during high-temperature creep, the site-occupation scenario in the γ′ lattice evolves as that, the preference at both α- and β-sites for Co, Ta and Re weakens while that of W and Ru remains nearly unchanged, indicating the overall decrease in ordering and thus the easier dislocation shearing in γ′.
