Kinetics of Order-Disorder Transition of Antiphase Domain Boundary Formed between DO₂₂ Phases: Microscopic Phase-Field Study

Abstract:

Based on the microscopic phase-field model, the precipitation process of Ni75Al4.3V20.7 alloy at 1190K is simulated, and the kinetics of order-disorder transition at antiphase domain boundary (APDB) formed between DO22 (Ni3V) phases is investigated. After the ordered APDB formed by the impingement of growing DO22 (Ni3V) domains, the order-disorder transition at APDB is happened. Accompanied with the enrichment of Ni and Al at the APDB, the ordered APDB transforms into a thin disordered phase layer. The second phase L12 nucleates at the order-disorder interface between DO22 and disordered phases, and grows along the disorder phase layer quickly. The order-disorder transition at the ordered APDB accelerates the nucleation and growth of L12 phase at the APDB. The disordered phase caused by the order-disordered transition can be considered the transient phase during the precipitation process of L12 phase.

• Periodical: Advanced Materials Research (Volumes 160-162)
• Pages: 996-1000
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.160-162.996
• Online since: November 2010
• Authors: Ming Yi Zhang, Kun Yang, Zheng Chen
• Keywords: Antiphase Domain Boundary, DO₂₂(Ni₃V) Phase, Microscopic Phase-Field, Order-Disorder Transition

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