Simultaneously improving strength and ductility has been an attractive theme in materials science and engineering. Through designing nanostructures, it is possible to overcome the traditional trade-off between ductility and strength of materials. In this paper, we show that introducing superlattice intrinsic stacking faults in nickel aluminide (Ni₃Al) can facilitate its strength and toughness. In comparison with twin boundaries, the enhancing effect of superlattice intrinsic stacking faults is more obvious. Most significantly, the yield strength of samples with superlattice intrinsic stacking faults is always superior to their single crystalline counterparts, indicating that the yield strength of single crystalline Ni₃Al can be exceeded. These findings provide new insights into the nanostructural design of aerospace materials.

同时提高强度和延展性一直是材料科学和工程领域的一个有吸引力的主题。通过设计纳米结构，可以克服材料延展性和强度之间的传统权衡。在本文中，我们表明在铝化镍 (Ni ₃ Al)中引入超晶格本征堆垛层错可以促进其强度和韧性。与孪晶界相比，超晶格本征堆垛层错的增强作用更为明显。最重要的是，具有超晶格本征堆垛层错的样品的屈服强度总是优于其单晶对应物，表明单晶 Ni ₃的屈服强度可以超过Al。这些发现为航空航天材料的纳米结构设计提供了新的见解。