A highly distorted ultraelastic chemically complex Elinvar alloy

Q. F. He, J. G. Wang, H. A. Chen, Z. Y. Ding, Z. Q. Zhou, L. H. Xiong, J. H. Luan, J. M. Pelletier, J. C. Qiao, Q. Wang, L. L. Fan, Y. Ren, Q. S. Zeng, C. T. Liu, C. W. Pao (), D. J. Srolovitz () and Y. Yang ()
Additional contact information
Q. F. He: City University of Hong Kong
J. G. Wang: City University of Hong Kong
H. A. Chen: National Taipei University of Technology
Z. Y. Ding: City University of Hong Kong
Z. Q. Zhou: City University of Hong Kong
L. H. Xiong: Argonne National Laboratory
J. H. Luan: City University of Hong Kong
J. M. Pelletier: Université de Lyon, UMR CNRS5510, INSA-Lyon
J. C. Qiao: City University of Hong Kong
Q. Wang: Shanghai University
L. L. Fan: Tianjin Normal University
Y. Ren: Argonne National Laboratory
Q. S. Zeng: Center for High Pressure Science and Technology Advanced Research
C. T. Liu: City University of Hong Kong
C. W. Pao: Academia Sinica
D. J. Srolovitz: The University of Hong Kong
Y. Yang: City University of Hong Kong

Nature, 2022, vol. 602, issue 7896, 251-257

Abstract: Abstract The development of high-performance ultraelastic metals with superb strength, a large elastic strain limit and temperature-insensitive elastic modulus (Elinvar effect) are important for various industrial applications, from actuators and medical devices to high-precision instruments1,2. The elastic strain limit of bulk crystalline metals is usually less than 1 per cent, owing to dislocation easy gliding. Shape memory alloys3—including gum metals4,5 and strain glass alloys6,7—may attain an elastic strain limit up to several per cent, although this is the result of pseudo-elasticity and is accompanied by large energy dissipation3. Recently, chemically complex alloys, such as ‘high-entropy’ alloys8, have attracted tremendous research interest owing to their promising properties9–15. In this work we report on a chemically complex alloy with a large atomic size misfit usually unaffordable in conventional alloys. The alloy exhibits a high elastic strain limit (approximately 2 per cent) and a very low internal friction (less than 2 × 10−4) at room temperature. More interestingly, this alloy exhibits an extraordinary Elinvar effect, maintaining near-constant elastic modulus between room temperature and 627 degrees Celsius (900 kelvin), which is, to our knowledge, unmatched by the existing alloys hitherto reported.

Date: 2022
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DOI: 10.1038/s41586-021-04309-1

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