Microstructure evolution behavior of Ni3Al (γ′) phase in eutectic γ-γ′ of Ni3Al-based alloy
作者： Jian Ding , Shan Jiang , Yanmo Li , Yuting Wu , Jing Wu
DOI: 10.1016/J.INTERMET.2018.04.010
关键词:
摘要: Abstract Based on its excellent high-temperature performances, polycrystalline Ni3Al-based alloys have attracted more and attention. In this work, different thermal cycle aging treatments (TCAT) were applied to investigate microstructure evolution behavior of Ni3Al (γ′) phase in eutectic γ-γ′ area JG4246A alloy. SEM equipped with energy dispersive X-ray spectrometer (EDS) high-resolution transmission electron microscopy (HRTEM) used for observation mechanism analysis. The results showed that plate-like twinning formed due initial state the alloy cyclic treatment conditions. Meanwhile, blocky precipitated along dual (γ+γ′) ((γ-γ′)/(γ+γ′)) interfaces. Vacancies dislocations generated during short-term TCAT responsible formation phases as-cast While, solution-treated alloy, internal stress long-term led (γ-γ′)/(γ+γ′) interface.
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