Plastic and low-cost axial zero thermal expansion alloy by a natural dual-phase composite

Chengyi Yu, Kun Lin (), Suihe Jiang, Yili Cao, Wenjie Li, Yilin Wang, Yan Chen, Ke An, Li You, Kenichi Kato, Qiang Li, Jun Chen, 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
Suihe Jiang: University of Science and Technology Beijing
Yili Cao: University of Science and Technology Beijing
Wenjie Li: University of Science and Technology Beijing
Yilin Wang: University of Science and Technology Beijing
Yan Chen: Oak Ridge National Laboratory
Ke An: Oak Ridge National Laboratory
Li You: University of Science and Technology Beijing
Kenichi Kato: RIKEN SPring-8 Center
Qiang Li: University of Science and Technology Beijing
Jun Chen: University of Science and Technology Beijing
Jinxia Deng: University of Science and Technology Beijing
Xianran Xing: University of Science and Technology Beijing

Nature Communications, 2021, vol. 12, issue 1, 1-8

Abstract: Abstract Zero thermal expansion (ZTE) alloys possess unique dimensional stability, high thermal and electrical conductivities. Their practical application under heat and stress is however limited by their inherent brittleness because ZTE and plasticity are generally exclusive in a single-phase material. Besides, the performance of ZTE alloys is highly sensitive to change of compositions, so conventional synthesis methods such as alloying or the design of multiphase to improve its thermal and mechanical properties are usually inapplicable. In this study, by adopting a one-step eutectic reaction method, we overcome this challenge. A natural dual-phase composite with ZTE and plasticity was synthesized by melting 4 atom% holmium with pure iron. The dual-phase alloy shows moderate plasticity and strength, axial zero thermal expansion, and stable thermal cycling performance as well as low cost. By using synchrotron X-ray diffraction, in-situ neutron diffraction and microscopy, the critical mechanism of dual-phase synergy on both thermal expansion regulation and mechanical property enhancement is revealed. These results demonstrate that eutectic reaction is likely to be a universal and effective method for the design of high-performance intermetallic-compound-based ZTE alloys.

Date: 2021
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DOI: 10.1038/s41467-021-25036-1

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