基于三元微观相场动力学模型,结合原子图像、序参数和体积分数等手段,模拟了Ni75Al12Cr13合金在900 K下的沉淀行为.结果表明:合金沉淀过程中析出L12和DO22两种有序相;L12相的早期沉淀机制为失稳分解,DO22相的早期沉淀机制为非经典形核和失稳分解的混合机制;L12相首先从无序固溶体中析出,随后DO22相在L12相的畴界处析出;平衡时,获得的L12相的体积分数大于DO22相体积分数.
Based on the dynamic model of ternary microscopic phase-field,a simulation on the precipitation behavior of Ni75 Al12Cr13 alloy at 900 K was made by combining the means of atomic pictures,order parameter and volume fraction.The result of the simulation shows that two kinds of ordered phase with different structures,L12 and DO22,are formed in the process of precipitation.Moreover,the mechanism of the early precipitation of L12 phase is a kind of spinodal decomposition,and that of the DO22 phase is a kind of mixed mechanism comprising of non-classical nucleation and spinodal decomposition.Furthermore,the L12 phase is firstly separated out from the random solid solution,and then the DO22 phase is separated out from the domain boundary of the L12phases.In addition,when the equilibrium is reached,the volume fraction of L12 phase is larger than that of the DO22 phase.
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