Achieving 5.9% elastic strain in kilograms of metallic glasses: Nanoscopic strain engineering goes macro
Name
Zhang20LiuMT.pdf
Description
Accepted version
Size
2.73 MB
Format
Adobe PDF
Checksum (MD5)
a8d380cb7e18aa1ebf404662557cee14
Author(s)
Zhang, Junsong
Liu, Yinong
Yang, Hong
Ren, Yang
Cui, Lishan
Jiang, Daqiang
Wu, Zhigang
Ma, Zhiyuan
Guo, Fangmin
Bakhtiari, Sam
Date Issued
2020
Journal
Materials Today
Publisher
Elsevier BV
Version
Author's final manuscript
Abstract
© 2020 Elsevier Ltd The ideal elastic limit is the upper bound of the achievable strength and elastic strain of solids. However, the elastic strains that bulk materials can sustain are usually below 2%, due to the localization of inelastic deformations at the lattice scale. In this study, we achieved >5% elastic strain in bulk quantity of metallic glass, by exploiting the more uniform and smaller-magnitude atomic-scale lattice strains of martensitic transformation as a loading medium in a bulk metallic nanocomposite. The self-limiting nature of martensitic transformation helps to prevent lattice strain transfer that leads to the localization of deformation and damage. This lattice strain egalitarian strategy enables bulk metallic materials in kilogram-quantity to achieve near-ideal elastic limit. This concept is verified in a model in situ bulk amorphous (TiNiFe)-nanocrystalline (TiNi(Fe)) composite, in which the TiNiFe amorphous matrix exhibits a maximum tensile elastic strain of ∼5.9%, which approaches its theoretical elastic limit. As a result, the model bulk composite possesses a large recoverable strain of ∼7%, a maximum tensile strength of above 2 GPa, and a large elastic resilience of ∼79.4 MJ/m3. The recoverable strain and elastic resilience are unmatched by known high strength bulk metallic materials. This design concept opens new opportunities for the development of high-performance bulk materials and elastic strain engineering of the physiochemical properties of glasses.
MIT Department
Massachusetts Institute of Technology. Department of Nuclear Science and Engineering
Massachusetts Institute of Technology. Department of Materials Science and Engineering
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Creative Commons Attribution-NonCommercial-NoDerivs License
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DOI of Published Version
https://doi.org/10.1016/j.mattod.2020.02.020
