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Microscopic phase-field study on order-disorder transition of the antiphase domain boundary formed between L12 phases

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Abstract

Kinetics of order-disorder transition at antiphase domain boundary (APDB) formed between L12 (Ni3Al) phases is investigated using microscopic phase-field model. The results demonstrate that whether order-disorder transition happens or not depends on the atomic structure of the APDB. Accompanied with the enrichment of V and depletion of Ni and Al, the ordered APDB with phase-shift vector of a/2[100] transforms into a thin disordered phase layer. Whereas at the APDB with phase shift vector of a/2[110], which remains ordered with temporal evolution, Ni and Al enrich and V depletes. Composition evolution of APDB with order-disorder transition favors the nucleation of DO22 phase, and the formation of disordered phase layer accelerates the growth of DO22 phase. The disordered phase caused by order-disordered transition of the APDB can be considered as the transient phase along the precipitation path of DO22 phase.

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Authors and Affiliations

  1. State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an, 710072, China

    MingYi Zhang, Kun Yang, Zhen Chen, YongXin Wang & XiaoLi Fan

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  1. MingYi Zhang
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  2. Kun Yang
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  3. Zhen Chen
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  4. YongXin Wang
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Correspondence to MingYi Zhang.

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Zhang, M., Yang, K., Chen, Z. et al. Microscopic phase-field study on order-disorder transition of the antiphase domain boundary formed between L12 phases. Sci. China Technol. Sci. 54, 3409–3414 (2011). https://doi.org/10.1007/s11431-011-4509-7

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  • DOI: https://doi.org/10.1007/s11431-011-4509-7

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