Abstract In this work, the nanometer-scale mass flow coupled to dislocation processes near the γ/γ′-interface during high temperature and low stress creep of a model Ni-base single crystal superalloy is investigated. In the early creep stages, the dislocation networks in the γ-phase at γ/γ′-interfaces attract γ-stabilizing elements like Cr, Co and in particular Re, resulting in compositional gradients close to the interface. At larger strains, where dislocations frequently cut into the γ′-phase, this local interfacial enrichment in these elements is no longer observed. The cutting dislocations take part of the segregated atoms away, whilst the remaining atoms are released and diffuse back into the γ-channels.

中文翻译：

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界面位错对单晶镍基高温合金高温低应力蠕变质量流动的影响

摘要 在这项工作中，研究了模型 Ni 基单晶高温合金在高温和低应力蠕变过程中与 γ/γ' 界面附近位错过程耦合的纳米级质量流。在蠕变的早期阶段，γ/γ′-界面的γ-相中的位错网络吸引了γ-稳定元素，如Cr、Co，特别是Re，导致靠近界面的成分梯度。在较大的应变下，位错经常切入 γ' 相，不再观察到这些元素中的这种局部界面富集。切割位错带走了部分分离的原子，而剩余的原子被释放并扩散回 γ 通道。