Zhang Zhiwei, Zhang Xingyi, Yang Rong, Wang Jun, Lu Chunsheng
Department of Mechanics and Engineering Sciences, College of Civil Engineering and Mechanics, Lanzhou University, Lanzhou 730000, China.
Key Laboratory of Mechanics on Environment and Disaster in Western China, The Ministry of Education of China, Lanzhou University, Lanzhou 730000, China.
Materials (Basel). 2024 Aug 12;17(16):4006. doi: 10.3390/ma17164006.
Ni/NiAl heterogeneous multilayer structures are widely used in aerospace manufacturing because of their unique coherent interfaces and excellent mechanical properties. Revealing the deformation mechanisms of interfacial structures is of great significance for microstructural design and their engineering applications. Thus, this work aims to establish the connection between the evolution of an interfacial misfit dislocation (IMD) network and tensile deformation mechanisms of Ni/NiAl multilayer structures. It is shown that the decomposition of IMD networks dominates the deformation of Ni/NiAl multilayer structures, which exhibits distinct effects on crystallographic orientation and layer thickness. Specifically, the Ni/NiAl (100) multilayer structure achieves its maximum yield strength of 5.28 GPa at the layer thickness of 3.19 nm. As a comparison, the (110) case has a maximum yield strength of 4.35 GPa as the layer thickness is 3.01 nm. However, the yield strength of the (111) one seems irrelevant to layer thickness, which fluctuates between 10.89 and 11.81 GPa. These findings can provide new insights into a deep understanding of the evolution and deformation of the IMD network of Ni/NiAl multilayer structures.
镍/镍铝异质多层结构因其独特的共格界面和优异的力学性能而广泛应用于航空航天制造领域。揭示界面结构的变形机制对于微观结构设计及其工程应用具有重要意义。因此，本工作旨在建立界面失配位错（IMD）网络的演化与镍/镍铝多层结构拉伸变形机制之间的联系。结果表明，IMD网络的分解主导了镍/镍铝多层结构的变形，这对晶体取向和层厚表现出不同的影响。具体而言，镍/镍铝（100）多层结构在层厚为3.19 nm时达到其最大屈服强度5.28 GPa。相比之下，（110）情况在层厚为3.01 nm时最大屈服强度为4.35 GPa。然而，（111）结构的屈服强度似乎与层厚无关，在10.89至11.81 GPa之间波动。这些发现可为深入理解镍/镍铝多层结构IMD网络的演化和变形提供新的见解。
