Superior zero thermal expansion dual-phase alloy via boron-migration mediated solid-state reaction

Chengyi Yu, Kun Lin (), Xin Chen, Suihe Jiang, Yili Cao, Wenjie Li, Liang Chen, Ke An, Yan Chen, Dunji Yu, Kenichi Kato, Qinghua Zhang, Lin Gu, Li You, Xiaojun Kuang, Hui Wu, Qiang Li, Jinxia Deng and Xianran Xing ()
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Chengyi Yu: University of Science and Technology Beijing
Kun Lin: University of Science and Technology Beijing
Xin Chen: University of Science and Technology Beijing
Suihe Jiang: University of Science and Technology Beijing
Yili Cao: University of Science and Technology Beijing
Wenjie Li: University of Science and Technology Beijing
Liang Chen: University of Science and Technology Beijing
Ke An: Oak Ridge National Laboratory
Yan Chen: Oak Ridge National Laboratory
Dunji Yu: Oak Ridge National Laboratory
Kenichi Kato: RIKEN SPring-8 Center
Qinghua Zhang: Chinese Academy of Sciences
Lin Gu: Chinese Academy of Sciences
Li You: University of Science and Technology Beijing
Xiaojun Kuang: Guilin University of Technology
Hui Wu: National Institute of Standards and Technology
Qiang Li: University of Science and Technology Beijing
Jinxia Deng: University of Science and Technology Beijing
Xianran Xing: University of Science and Technology Beijing

Nature Communications, 2023, vol. 14, issue 1, 1-9

Abstract: Abstract Rapid progress in modern technologies demands zero thermal expansion (ZTE) materials with multi-property profiles to withstand harsh service conditions. Thus far, the majority of documented ZTE materials have shortcomings in different aspects that limit their practical utilization. Here, we report on a superior isotropic ZTE alloy with collective properties regarding wide operating temperature windows, high strength-stiffness, and cyclic thermal stability. A boron-migration-mediated solid-state reaction (BMSR) constructs a salient “plum pudding” structure in a dual-phase Er-Fe-B alloy, where the precursor ErFe10 phase reacts with the migrated boron and transforms into the target Er2Fe14B (pudding) and α-Fe phases (plum). The formation of such microstructure helps to eliminate apparent crystallographic texture, tailor and form isotropic ZTE, and simultaneously enhance the strength and toughness of the alloy. These findings suggest a promising design paradigm for comprehensive performance ZTE alloys.

Date: 2023
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DOI: 10.1038/s41467-023-38929-0

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