P phase precipitation and strengthening behavior of a novel polycrystalline Ni3Al-based intermetallic alloy at 1100 °C.
In: Acta Materialia, Jg. 265 (2024-02-25), S. N.PAG
Online
academicJournal
Zugriff:
The microstructural evolution and strengthening behavior of a polycrystalline Ni 3 Al-based intermetallic alloy were investigated during varying durations of thermal exposure at 1100 °C. The study focused on the topologically closed-packed orthorhombic P phase precipitate, which was found to form in the interdendritic γ channel and grow in the γ' -matrix after thermal exposure. The morphology of the P phase evolved from needle-like to lath-like and then to blocky-like. The crystal structure and composition of the precipitates were analyzed using scanning transmission electron microscopy (STEM) and electron probe X-ray microanalysis (EPMA). The chemical composition of the P phase changed continuously during thermal exposure and the P phase was related to the γ' -matrix by three sets of orientation relationships (OR). The alloy's tensile properties and creep fracture time were enhanced during thermal exposure at 1100 °C for 2000 h due to P phase precipitation at grain boundaries or within the grain. Based on the experimental evidence of this study and theoretical strengthening behavior reported in the literature, a novel mechanism for in-situ precipitation strengthening was proposed. [Display omitted] [ABSTRACT FROM AUTHOR]
Titel: |
P phase precipitation and strengthening behavior of a novel polycrystalline Ni3Al-based intermetallic alloy at 1100 °C.
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Autor/in / Beteiligte Person: | Zhao, Yihan ; Chang, Yunpeng ; Li, Xiaopeng ; Xie, Youshui ; Sun, Yanwen ; Zhang, Hexin ; Zhao, Chengzhi |
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Zeitschrift: | Acta Materialia, Jg. 265 (2024-02-25), S. N.PAG |
Veröffentlichung: | 2024 |
Medientyp: | academicJournal |
ISSN: | 1359-6454 (print) |
DOI: | 10.1016/j.actamat.2023.119601 |
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