原子间相互作用能对Ni_(75)Al_xV_(25-x)合金孕育期影响的微观相场模拟  

Phase-Field Simulation for the Effect of Atomic Interchange Energy on the Incubation Time of Ni_(75)Al_xV_(25-x) Alloy

作　　者：徐聪[1] 陈铮[1] 王永欣[1] 钟汉文[1] 孙立岩[1] 苗海川[1] 

机构地区：[1]西北工业大学,陕西西安710072

出　　处：《稀有金属材料与工程》2009年第11期1935-1939,共5页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(50671084;50875217);中国博士后科学基金(2007040218);陕西省自然科学基金

摘　　要：基于微观相场动力学模型,研究原子间相互作用能对Ni75AlxV25-x合金孕育期的影响。根据Khachaturyan所给的占位几率公式进一步得到了长程序参数的求值公式。结果表明,先析出相为DO22时,Ni-Al最近邻原子间作用能VNi-Al增大,L12相的孕育期缩短,DO22相的孕育期变化不明显;Ni-V最近邻原子间作用能VNi-V增大,L12相和DO22相的孕育期均缩短。先析出相为L12相时,VNi-Al增大,L12相和DO22相孕育期均缩短;VNi-V增大,L12相孕育期变化不明显,DO22相的孕育期缩短。Based on the microscopic phase-field model, the effects of atomic interchange energy on the incubation time for Ni75AlxV25-x alloy have been researched, and the long range parameter＇s evaluation formula has obtained according to the formula for occupation probability by Khachaturyan. The experiment result shows that when the D022 phase is deposited firstly, the first-nearest atomic interchange energy between Ni-Al （namely VNi-Al） increases, the incubation time of L12 phase is shortened, but the incubation time of DO22 phase has no obvious change; and the first-nearest atomic interchange energy between Ni-V （namely VNi-V） increases, the incubation time of L12 phase and D022 phase is shortened. When the LIE phase is deposited firstly, the VNi-Al increases, both the incubation time of L12 phase and DO22 phase are shortened, and the VNi-V increases, the incubation time of L12 phase has no obvious change, and the incubation time of DOE2 phase is shortened.

关 键 词：孕育期 原子间相互作用能 微观相场 Ni75AlxV25-x合金 

分 类 号：TG146.23[一般工业技术—材料科学与工程]