Zhou Yinghao, Xiao Weicheng, Wang Dawei, Tang Xu, Shen Zheling, Li Weipeng, Zhang Jun, Zhao Shijun, Luan Junhua, An Zibing, Shi Rongpei, Yan Ming, Han Xiaodong, Liu C T, Zhao Yilu, Yang Tao
Department of Materials Science and Engineering, College of Engineering, City University of Hong Kong, Hong Kong, China.
Department of Mechanical Engineering, College of Engineering, City University of Hong Kong, Hong Kong, China.
Nat Commun. 2025 Jan 25;16(1):1036. doi: 10.1038/s41467-025-56355-2.
Ordered intermetallic alloys are renowned for their impressive mechanical, chemical, and physical properties, making them appealing for various fields. However, practical applications of them have long been severely hindered due to their severe brittleness and poor fabricability. It is difficult to fabricate such materials into components with complex geometries through traditional subtractive manufacturing methods. Here, we proposed a strategy to solve these long-standing issues through the additive manufacturing of chemically complex intermetallic alloy (CCIMA) based on laser powder bed fusion (LPBF). The developed CCIMA exhibits good printability, enabling a crack-free microstructure with a low porosity of 0.005%. More importantly, a good combination of high tensile strength (1.6 GPa) and large uniform elongation (35%) can be achieved, which has not been reported in the existing additive-manufactured alloys. Such properties are attributed to the structural and chemical features of highly ordered superlattice grain decorated with disordered interfacial nanolayer, as well as dynamic evolutions and interactions of multiple dislocation substructures. These findings could provide references for developing high-performance intermetallic alloys and accelerating their practical applications.
有序金属间化合物合金以其令人印象深刻的机械、化学和物理性能而闻名，这使其在各个领域都具有吸引力。然而，由于其严重的脆性和较差的可加工性，它们的实际应用长期以来一直受到严重阻碍。通过传统的减法制造方法将此类材料制造成具有复杂几何形状的部件是困难的。在此，我们提出了一种基于激光粉末床熔融（LPBF）的化学复杂金属间化合物合金（CCIMA）增材制造策略来解决这些长期存在的问题。所开发的CCIMA表现出良好的可打印性，能够实现具有0.005%低孔隙率的无裂纹微观结构。更重要的是，可以实现高拉伸强度（约1.6 GPa）和大均匀伸长率（约35%）的良好组合，这在现有的增材制造合金中尚未见报道。这些性能归因于由无序界面纳米层装饰的高度有序超晶格晶粒的结构和化学特征，以及多个位错亚结构的动态演变和相互作用。这些发现可为开发高性能金属间化合物合金并加速其实际应用提供参考。
