Ni-Co合金快淬过程的分子动力学模拟
Molecular dynamics simulation of Ni-Co alloy melt-spinning process
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摘要: 采用分子动力学模拟熔体旋淬技术的合金快淬过程，在不同的冷却速度下研究Ni-Co合金在快淬后的结构特征。模拟发现:Ni-Co二元合金的凝固过程对冷却速率的变化较为敏感，体系对形成非晶对冷却速率要求较高，约在80 K/ps以上，可以采用增加添加元素的方法来降低材料对冷却速率的要求；在75 K/ps的冷却速率下合金最终完全晶化，发生结构转变，而且在较低温度(375 K)下很明显。Abstract: The process of the quenching Ni-Co alloy prepared by melt-spinning technology is simulated by molecular dynamics simulation, and the structure characteristics of Ni-Co alloy are studied at different cooling rates. The simulation shows that, the alloy solidification process is sensitive to the cooling rate, and the formation of binary Ni-Co amorphous structure needs a high cooling rate above 80 K/ps. Add additional elements can reduce the required cooling rate of the materials. The alloy is completely crystalline at the cooling rate of 75 K/ps, and the structural change happens, especially at 375 K.
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Key words:
- ni-co alloy /
- melt-spinning /
- cooling rates /
- molecular dynamics /
- embedded atom method
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