Wang Xizheng, Zhao Yunhao, Chen Gang, Zhao Xinpeng, Liu Chuan, Sridar Soumya, Pizano Luis Fernando Ladinos, Li Shuke, Brozena Alexandra H, Guo Miao, Zhang Hanlei, Wang Yuankang, Xiong Wei, Hu Liangbing
Department of Materials Science and Engineering, University of Maryland, College Park, Maryland, 20742, USA.
Center for Materials Innovation, University of Maryland, College Park, Maryland, 20742, USA.
Nat Commun. 2022 Nov 7;13(1):6724. doi: 10.1038/s41467-022-34471-7.
Multi-principal element alloys (MPEA) demonstrate superior synergetic properties compared to single-element predominated traditional alloys. However, the rapid melting and uniform mixing of multi-elements for the fabrication of MPEA structural materials by metallic 3D printing is challenging as it is difficult to achieve both a high temperature and uniform temperature distribution in a sufficient heating source simultaneously. Herein, we report an ultrahigh-temperature melt printing method that can achieve rapid multi-elemental melting and uniform mixing for MPEA fabrication. In a typical fabrication process, multi-elemental metal powders are loaded into a high-temperature column zone that can be heated up to 3000 K via Joule heating, followed by melting on the order of milliseconds and mixing into homogenous alloys, which we attribute to the sufficiently uniform high-temperature heating zone. As proof-of-concept, we successfully fabricated single-phase bulk NiFeCrCo MPEA with uniform grain size. This ultrahigh-temperature rapid melt printing process provides excellent potential toward MPEA 3D printing.
与以单一元素为主的传统合金相比，多主元合金（MPEA）展现出卓越的协同性能。然而，通过金属3D打印制造MPEA结构材料时，多种元素的快速熔化和均匀混合颇具挑战，因为在一个足够的加热源中同时实现高温和均匀的温度分布是困难的。在此，我们报道一种超高温熔体打印方法，该方法能够实现用于制造MPEA的多种元素的快速熔化和均匀混合。在典型的制造过程中，将多元素金属粉末装入一个高温柱形区域，该区域可通过焦耳加热升温至3000 K，随后在毫秒量级的时间内熔化并混合成均匀的合金，这归因于足够均匀的高温加热区域。作为概念验证，我们成功制备出了具有均匀晶粒尺寸的单相块状NiFeCrCo MPEA。这种超高温快速熔体打印工艺在MPEA 3D打印方面具有巨大潜力。
