Exploring atomic occupation of ternary alloy elements at L12-Ni3Al sub-lattice
The Ni3Al phase of L12 crystal lattice is the most important strengthening phase for nickel-base super-alloy of an aero-engine. The configuration of atomic occupation of alloy elements at the L12-Ni3Al sub-lattice plays a key role in its serving properties in the thermal-mechanic condition. Through...
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| Main Authors: | , , |
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| Format: | Article |
| Language: | zho |
| Published: |
EDP Sciences
2025-04-01
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| Series: | Xibei Gongye Daxue Xuebao |
| Subjects: | |
| Online Access: | https://www.jnwpu.org/articles/jnwpu/full_html/2025/02/jnwpu2025432p285/jnwpu2025432p285.html |
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| Summary: | The Ni3Al phase of L12 crystal lattice is the most important strengthening phase for nickel-base super-alloy of an aero-engine. The configuration of atomic occupation of alloy elements at the L12-Ni3Al sub-lattice plays a key role in its serving properties in the thermal-mechanic condition. Through establishing the phase-field model of a ternary alloy system and solving the micro-diffusion dynamic functions, the spatial-temporal information on the atomic occupation of different L12-Ni3Al sub-lattices is tracked, the occupation capability of ternary alloy elements is assessed and the atomic density distribution at single-lattice points is obtained. The atomic occupation of Ni-Al-V and Ni-Al-Cr precipitation phases in the L12-Ni3Al sub-lattice after the phase transformation path of FCC→L12+D022 is studied. The results show that through the time-related order process, the atomic occupation removes the competitive growth in the homogeneous or heterogeneous phase in the early phase transformation and the random fluctuation that interface migration causes to the sub-lattices. The Ni3Al phase is in fact a compound metal alloy phase. The antisite and substitution site are the functions of the binary solute ratio. The addition of Cr and V has an obvious difference in affecting the antisite and substitution site in different sub-lattices, which is related to sub-lattice type, defect type and alloy element type. |
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| ISSN: | 1000-2758 2609-7125 |