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金属学报  2005 

相场法预测低铝合金Ni75AlxV25-x的早期沉淀过程

, PP. 695-702

Keywords: 微观相场法,计算机模拟,Ni75AlxV25-x合金

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Abstract:

采用微观相场模型,通过分析原子图像、有序相内序参数分布及有序相体积分数随时间的变化,在原子尺度对低Al浓度Ni75AlxV25-x合金的早期沉淀动力学进行了计算机预测。研究发现该合金沉淀过程中,析出D022结构的?(Ni3V)相和L12结构的??Ni3Al相,二者构成伪二元系;?相先于??相析出,?相的沉淀机制为等成分有序化+失稳分解,??相在?相的相界处非经典形核,二者均先形成非化学计量比有序相,之后向化学计量比有序相转变;随Al浓度增加,?相析出变慢,所占比例减少,而??相反之,析出越来越早且所占比例增加。

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