侯华
,
赵宇宏
,
陈铮
,
徐宏
金属学报
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。
关键词:
微观相场法
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computer simulation
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null
K.S. Guan
金属学报(英文版)
Atomic growth process and structure of Amorphous Electroless Coating have beenstudied, using Monte-Carlo simulation method. The simulation results of amorphousNi80P20 coating show that PDFs are in accordance with practical values. The mi-grations of adatoms in coating's growth are different from that of solidification ofamorphous materials. In some cases, the migrated adatoms in the process of growthof amorphous coating are not enough to occupy all vacancies and traps, so the amor-phous coating is micro-porous. The immovable probability k and the largest migrationdistance of adatoms, which lie on the electroless bath components, affect the PDF,volume density and microporosity remarkably.
关键词:
electroless Ni-P alloy
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null
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null
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null
