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Cite this article:
. . Acta Metall Sin, 2007, 43(10): 1101-1106 .
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Abstract Microscopic phase-field model was used to simulate the interphase boundaries formed between ordered L12 domains in Ni-Al-V alloy. The interphase boundary structure and the behavior of atoms at the boundary were investigated using the occupation probability of atoms. The results show that there are three kinds of stable interphase boundaries and two kinds of transitional interphase boundaries formed between ordered L12 domains. It is found that the migration ability is related to the structure of interphase boundary. The stable interphase boundary which has two Ni atoms and with(001)L12 and (002)L12 in alignment or with (001)L12 and (001)L12 in alignment can migrate and form a transitional interphase boundary in the process of migration, the structure of interphase boundary is invariaent before and after the migration. The interphase boundary which has one Ni atom and with (001)L12 and (002)L12 in alignment can not migrate. The elements of alloy have different preferences of accumulation or leanness at different boundaries, Al is leanness at all kinds of boundaries but V accumulates, Ni is leanness at movable boundary but accumulates at the unmovable boundary. The degree of leanness and accumulation are also different at different boundaries.
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Received: 10 January 2007
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