NiAl化合物表面成分的准标度关系与偏离放大效应
Quasi-exponentid relationship and amplification effects of surface component for NiAl compound
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摘要: 研究金属间化合物.NiAl的表面结构和成分对于理解其抗氧化机制、断裂过程等非常重要.采用巨正则系综Monte Carlo方法对NiA1内部和(11O)表面层的原子分布、点缺陷浓度、长程序参数等进行了模拟计算,发现1273 K温度的NiA1化合物在富A1段表面层和内部成分比例之间存在准标度关系,合金成分比例对化学计量比的偏离在表面层被放大,放人系数超过30倍.Abstract: A detailed knowledge of the structure and composition of NiAl compound is essential for understanding its oxidation resistance and the fracture process.The atomic distribution,concentration and long range order parameters in interior and(110) surface layer of NiAl compound at 1273 K are calculated by the grand canonical Monte Carlo simulation method.We find a quasi-exponentid relationship between the component deviations from the stoichiometry in surface layer and interior of NiAl in Al-rich region.It is observed that the deviation of component from stoichiometry in surface layer is over 30 times greater than that in interior.
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