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采用分子动力学模拟方法,研究了层厚度和应变率对铜-金多层复合纳米线在均匀拉伸载荷下力学性能的影响,并分析了铜-金位错成核机理.研究结果表明,随着铜-金层厚度的增加,复合材料的屈服强度也随之增大;高应变率时复合材料的力学性能比低应变率时要强,低应变率的塑性形变主要是位错运动和孪晶形变,而高应变率主要以单原子运动为主,表现出了非晶化.该研究对制备高性能的多层复合材料提供了一定的理论依据.
The effects of layer thickness and strain rate on the mechanical properties of Cu-Au multilayered composite nanowires under uniform tensile loading were studied by molecular dynamics simulation method, and the nucleation mechanism of copper-gold dislocations was analyzed.The results show that, With the increase of copper-gold thickness, the yield strength of the composites also increases. The mechanical properties of composites at high strain rates are stronger than those at low strain rates. The plastic deformations at low strain rates are mainly dislocation motion and twinning Crystal deformation, while the high strain rate is dominated by monatomic motions, showing amorphization.The study provides a theoretical basis for the preparation of high-performance multilayer composite materials.