The effect of segregation thickness in the grain boundary affect zone (GBAZ) on the mechanical behaviors of nanocrystalline nickel (Ni)-doped tungsten (W) alloy is analyzed by molecular dynamic simulation. The results show that segregation thickness in the GBAZ affects the mechanical behaviors in an obvious way. The curve of segregation thickness vs peak stress is similar to the relationship between grain size and strength. The optimal mechanical behavior can be obtained when the segregation thickness in the GBAZ is controlled to around 7.5 Å. Changes in the GBAZ segregation thickness lead to different numbers of amorphous atoms and various defect activities, which is the reason for the strength difference.

通过分子动力学模拟分析了晶界影响区(GBAZ)中偏析厚度对纳米晶镍(Ni)掺杂钨(W)合金力学行为的影响。结果表明，GBAZ 中的偏析厚度以明显的方式影响力学行为。偏析厚度与峰值应力的曲线类似于晶粒尺寸与强度之间的关系。当 GBAZ 中的偏析厚度控制在 7.5 Å 左右时，可以获得最佳的机械性能。GBAZ偏析厚度的变化导致不同数量的非晶原子和各种缺陷活动，这是强度差异的原因。