材料科学
成核
位错
复合材料
打滑(空气动力学)
层错能
皮尔斯应力
分子动力学
应变硬化指数
堆积
硬化(计算)
变形(气象学)
叠加断层
变形机理
部分位错
软化
极限抗拉强度
凝聚态物理
结晶学
位错蠕变
微观结构
图层(电子)
热力学
计算化学
物理
化学
核磁共振
作者
Qing Gao,Wei Li,Junqiang Ren,Xin Guo,Qilun Li,Xuefeng Lu,Jisen Qiao
标识
DOI:10.1142/s0217984924501525
摘要
Layered metal composites have been widely used in various industries fields because of their excellent properties and are responsible for mechanical behavior of materials. This paper focuses on analyzing the deformation mechanism of the (110) interface under different loading states by MD. The results show that there are two yield points in the stress–strain curve under both Z- and Y-axis loading states. The first yield is the nucleation of dislocations at the interface, meantime the slip of dislocations and the extension of stacking faults begin at the Al layer. The second one, the dislocation passes through the interface, nucleates and emits toward the Cu layer at the interface, leading to a stress mutation. It is worth noting that during the stable rheological stage, the deformation mechanisms vary under different loading directions. Under Y-axis tensile loading, the phase transformation of FCC–HCP is present due to the interaction of dislocation movement and stacking fault. On the contrary, there are two twin paths A and B, improving the strength, during Z-axis compression loading. For other loading modes, there are three zones, namely the elastic stage, the release of energy, and strain hardening and dynamic softening. The interface plays the role of nucleation, annihilation and penetration of dislocations, and this interface-dislocation mechanism is reflected in the whole stage of plastic deformation. The results have an insight into the design and control in heterointerface.
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