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基于EAM势,采用分子动力学方法对超细镍纳米线(直径分别为3.94、4.95和5.99 nm)在?100?晶向的拉伸性能进行研究,并对其温度相关性和拉伸应变率相关性进行探讨。结果表明:弹性模量和屈服强度随着温度的升高而逐渐降低,并且随着拉伸应变率的增大,应力—应变曲线波动程度变大,超细镍纳米线发生断裂时的应变越来越小。在0.01 K温度下,超细镍纳米线屈服强度随拉伸应变率的升高迅速降低;但在其它温度条件下,拉伸应变率对弹性模量和屈服强度的影响较小。简要分析尺寸大小对镍纳米线拉伸性能的影响。
Based on the EAM potential, the tensile properties of ultrafine nickel nanowires (3.94, 4.95 and 5.99 nm in diameter) in the? 100? Direction were investigated by molecular dynamics method. The temperature dependence and tensile strain rate Relevance to explore. The results show that the elastic modulus and yield strength decrease gradually with the increase of temperature. With the increase of tensile strain rate, the stress-strain curve becomes larger and the strain at break of ultrafine nickel nanowire increases The smaller it is. At 0.01 K, the yield strength of ultrafine nickel nanowires rapidly decreases with the increase of tensile strain rate; however, tensile strain rate has little effect on elastic modulus and yield strength at other temperatures. The effect of size on the tensile properties of nickel nanowires was briefly analyzed.