论文标题
Fe-Ni中的相互依存线性肤色结构和脱位力学
Interdependent linear complexion structure and dislocation mechanics in Fe-Ni
论文作者
论文摘要
使用大尺度的原子模拟，在线性肤色存在下的脱位力学在Fe-Ni合金中进行了研究，在该合金中，肤色作为沿边缘错位线的纳米颗粒阵列出现。当将机械剪切应力应用于驱动错位运动时，在缺陷受其线性肤色结构限制的情况下观察到强钉效应。在第一次脱位脱位事件后，这种固定效果变得较弱，导致具有深刻初始屈服点的应力应变曲线，类似于具有相同类型的线性肤色的Fe-MN合金在实验中观察到的静态应变老化行为。这种响应的存在可以通过与线性肤色纳米颗粒中的L10到B2相变相对应的局部无扩散和晶格扭曲变换来解释。因此，发现线性肤色结构与错位力学之间的相互依赖性。
Using large-scale atomistic simulations, dislocation mechanics in the presence of linear complexions are investigated in an Fe-Ni alloy, where the complexions appear as nanoparticle arrays along edge dislocation lines. When mechanical shear stress is applied to drive dislocation motion, a strong pinning effect is observed where the defects are restricted by their own linear complexion structures. This pinning effect becomes weaker after the first dislocation break-away event, leading to a stress-strain curve with a profound initial yield point, similar to the static strain ageing behavior observed experimentally for Fe-Mn alloys with the same type of linear complexions. The existence of such a response can be explained by local diffusion-less and lattice distortive transformations corresponding to L10-to-B2 phase transitions within the linear complexion nanoparticles. As such, an interdependence between linear complexion structure and dislocation mechanics is found.
