An isotropic zero thermal expansion alloy with super-high toughness

Chengyi Yu, Kun Lin, Qinghua Zhang, Huihui Zhu, Ke An, Yan Chen, Dunji Yu, Tianyi Li, Xiaoqian Fu, Qian Yu, Li You, Xiaojun Kuang, Yili Cao, 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
Qinghua Zhang: Chinese Academic of Science
Huihui Zhu: University of Science and Technology Beijing
Ke An: Oak Ridge National Laboratory
Yan Chen: Oak Ridge National Laboratory
Dunji Yu: Oak Ridge National Laboratory
Tianyi Li: Argonne National Laboratory
Xiaoqian Fu: Zhejiang University
Qian Yu: Zhejiang University
Li You: University of Science and Technology Beijing
Xiaojun Kuang: Guilin University of Technology
Yili Cao: University of Science and Technology Beijing
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, 2024, vol. 15, issue 1, 1-9

Abstract: Abstract Zero thermal expansion (ZTE) alloys with high mechanical response are crucial for their practical usage. Yet, unifying the ZTE behavior and mechanical response in one material is a grand obstacle, especially in multicomponent ZTE alloys. Herein, we report a near isotropic zero thermal expansion (αl = 1.10 × 10−6 K−1, 260–310 K) in the natural heterogeneous LaFe54Co3.5Si3.35 alloy, which exhibits a super-high toughness of 277.8 ± 14.7 J cm−3. Chemical partition, in the dual-phase structure, assumes the role of not only modulating thermal expansion through magnetic interaction but also enhancing mechanical properties via interface bonding. The comprehensive analysis reveals that the hierarchically synergistic enhancement among lattice, phase interface, and heterogeneous structure is significant for strong toughness. Our findings pave the way to tailor thermal expansion and obtain prominent mechanical properties in multicomponent alloys, which is essential to ultra-stable functional materials.

Date: 2024
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DOI: 10.1038/s41467-024-46613-0

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