铱单晶纳米线在不同应力状态下的变形行为

The Deformation Behavior of Iridium Single Crystal Nanowire under Different Stress Conditions

基于分子动力学模拟方法计算了铱单晶纳米线在室温下的拉伸和压缩变形行为。计算结果表明,铱单晶纳米线在拉伸和压缩时的力学性能均存在尺寸效应。铱单晶纳米线的拉伸和压缩变形行为具有非对称性,在拉伸条件下其伸长率为14%,而在压缩条件下表现出较好的塑性,在压缩过程中有堆垛层错产生,压缩应变达到0.499后模型还未发生断裂。

The tension and compression deformation behavior of iridium single crystal nanowire at 300K was calculated using molecular dynamics simulation. The results showed that the mechanical properties of iridium single crystal nanowire exists size effects during both tension and compression. Its deformation behavior under tension and compression is asymmetry. The elongation of iridium single crystal nanowire under tension is 14%, while it shows better plasticity under compression. During compression stacking faults are generated. The model has not broken even though strain reaches 0.499.