中文摘要：

运用微观相场法研究Ni75Al5.3V19.7合金沉淀过程中L12结构和D022结构反位缺陷发现：在沉淀初期,L12结构反位缺陷AlNi,VNi,NiAl,D022结构反位缺陷VNi,AlNi,Niv,Alv的浓度均从初始高度反位状态随沉淀过程的进行逐渐减小并趋于一平衡值;沉淀中后期,L12结构和D022结构长大,反位缺陷浓度始终保持平衡,平衡时L12结构的α格点反位缺陷AlNi,VNi,D022结构的α格点反位缺陷VNi,AlNi的浓度均在10-2数量级,L12结构和D022结构的β格点的反位缺陷NiAl,Niv的浓度在10-1数量级,NiAl,Niv反位缺陷分别是这两种结构的主要反位缺陷类型;第三组元在有序相中有择优占位倾向,V原子优先占据L12结构的β格点,Al原子优先占据D022结构的α格点.

英文摘要：

The antisite defect for L1_2-structure Ni_3Al and D0_（22） -structure Ni_3V of Ni_（75） Al_（5.3） V_（19.7） alloy is studied by microscopic phase field method in this paper.The results show that the concentration of antisite defects Al_ Ni,V_ Ni and Ni_ Al for L1_2 structure,V_ Ni,Al_ Ni,N_ iv and Al_V for D0_ 22 structure all decrease with precipitate process and reach to equilibrium values at the early stage of precipitation respectively.With the elapse of time,the two structures grow up while the concentrations of antisite defects always keep unchanged.The concentrations of equilibrium state antisite defects Al_ Ni and V_ Ni for L1_2 structure α site,V_ Ni and Al_ Ni for D0_ 22 structure α site are of the 10 -2 order,and antisite defect Ni_ Al for L1_2 structure β site,Ni_V for D0_ 22 structure β site are of 10 -1 order,the two defects being the main antisite defects for the L1_2 and D0_ 22 structures.The addition element has a great site-preference for a certain ordered phase,V atom prefers to occupy L1_2 structure β site while Al atom prefers to occupy D0_ 22 structure α site.