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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Ni_(75)Al_(12)Cr_(13)合金在900 K下的沉淀行为。结果表明:合金沉淀过程中析出L_(12)和DO_(22)两种有序相;L_(12)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;L_(12)相首先从无序固溶体中析出,随后DO_(22)相在L_(12)相的畴界处析出;平衡时,获得的L_(12)相的体积分数大于DO_(22)相体积分数。
The precipitation behavior of Ni_ (75) Al_ (12) Cr_ (13) alloy at 900 K was simulated based on the ternary microscopic phase field kinetics model with atomic images, ordinal parameters and volume fraction. The results show that two kinds of ordered phases, L_ (12) and DO_ (22), are precipitated during the precipitation process. The early precipitation mechanism of L_ (12) phase is instable decomposition, and the early precipitation mechanism of DO_ The phase of L_ (12) is firstly precipitated from the disordered solid solution and then the DO_ (22) phase is precipitated at the boundary of L_ (12) phase. At equilibrium, the volume fraction of L_ (12) Greater than DO_ (22) phase volume fraction.