Abstract
Fast development of space technologies poses a strong challenge for elastic materials, which need to be not only lightweight, strong and compliant, but also able to maintain stable elasticity over a wide temperature range1,2,3,4. Here we report a lightweight magnesium–scandium strain glass alloy (Mg with 21.3 at.% Sc) that meets this challenge. This alloy is as light (density ~2 g cm–3) and compliant as organic-based materials5,6,7 like bones and glass fibre reinforced plastics, but in contrast with those materials, it possesses a nearly temperature-independent (or Elinvar-type), ultralow Young’s modulus (~20–23 GPa) over a wide temperature range from room temperature down to 123 K; a higher yield strength of ~200–270 MPa; and a long fatigue life of over one million cycles. As a result, it exhibits a relatively high, temperature-independent elastic energy density of ~0.5 kJ kg–1 among known materials at a moderate stress level of 200 MPa. We show that its exceptional properties stem from a strain glass transition, and the Elinvar-type elasticity originates from its moderate elastic softening effect cancelling out the ever-present elastic hardening. Our findings provide insight into designing materials that possess unconventional and technologically important elastic properties.
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All data generated or analysed during this study are included in the published article and Supplementary Information and are available from the corresponding authors upon request.
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (51701150, 51831006, 52071257, 51901243) and the National 111 Project 2.0 (BP2018008).
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Y.J. and X.R. conceived the idea. C.L. and Y.J. designed the project. C.L., J.T., M.H. and T.M. fabricated the samples. C.L., J.T. and P.L. performed experiments, and C.L. analysed the results with all the authors. D.W. helped analyse the mechanism of the Elinvar effect. C.L., Y.J. and X.R. wrote the manuscript with input from all the authors.
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Nature Materials thanks Ibrahim Karaman and the other, anonymous, reviewer(s) for their contribution to the peer review of this work.
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Liu, C., Ji, Y., Tang, J. et al. A lightweight strain glass alloy showing nearly temperature-independent low modulus and high strength. Nat. Mater. 21, 1003–1007 (2022). https://doi.org/10.1038/s41563-022-01298-y
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DOI: https://doi.org/10.1038/s41563-022-01298-y
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