Materials Science & Engineering
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Item Ultrahigh-Temperature Melt Printing of Multi-Principal Element Alloys(Nature Portfolio, 2022-11-07) 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, LiangbingMulti-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 multielemental melting and uniform mixing for MPEA fabrication. In a typical fabrication process, multi-elemental metal powders are loaded into a hightemperature 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