基于三元微观相场动力学模型,结合原子图像和体积分数等手段模拟了Ni_(75)Al_6Cr_(19)合金在不同温度下的沉淀行为.结果表明:随着时效温度从873 K升高至1 023 K,Ni_(75)Al_6Cr_(19)合金由DO_(22)和L1_2两相共存组织转变为DO_(22)单相组织;受弹性畸变能影响,有序相颗粒沿[100]和[010]方向排列,且时效温度升高,择优取向性愈发显著.平衡时,先析出DO_(22)相的体积分数大于后析出L1_2相的体积分数.
The ternary microscopic phase-field is used in simulating the temperature effects on the precipitation behavior of Ni_(75)A_(16)Cr_(19) alloy through atomic pictures and volume fraction. The results show that microstructure of Ni_(75)Al_6Cr_(19) alloy converts from coexistence of DO_(22) phase and L1_2 phase to a single DO_(22) phase with the aging temperature rising from 873 K to 1 023 K. Under the effects of elastic strain energy, the cubic particles exhibit directional alignment along [100] and [010] directions during the late precipitation, which is more obvious at a higher temperature. DO_(22) phases appear earlier than L1_2 phases. When equilibrium is reached, the volume fraction of DO_(22) phase is far larger than that of Ll_2 phase.
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