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Rendering metals ultralow modulus and nearly hysteresis-free and linear super-elastic

Abstract

We demonstrate a new materials design approach to achieve unprecedented properties by utilizing nanoscale chemo-mechanical coupling. In particular, we show by computer simulation how to engineer ultralow-modulus (12 GPa), nearly hysteresis-free, and linear super-elastic metals with a giant elastic strain limit (2.7%) by creating appropriate concentration modulations (CMs) at the nanometer scale in the parent phase and by pre-straining to regulate a stress-induced martensitic transformation (MT). The nanoscale CMs created via spinodal decomposition in the parent phase causes its stability modulations at the same length scale, suppresses autocatalysis in nucleation, imposes nano-confinement on growth, and hinders long-range order of transformation strain during MT, which turn the otherwise sharp first-order transition into a broadly smeared, macroscopically continuous transition over a large stress range. The pre-straining yields retained martensitic particles that are stable at the test temperature after unloading and act as operational nuclei in subsequent load cycles, eliminating the stress-strain hysteresis and offering an ultralow apparent Young’s modulus. Materials with high strength and ultralow apparent Young’s modulus have great potential applications in orthopedic implants.

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Publication details

The article was received on 13 Sep 2018, accepted on 26 Nov 2018 and first published on 04 Dec 2018


Article type: Communication
DOI: 10.1039/C8MH01141A
Citation: Mater. Horiz., 2018, Accepted Manuscript
  • Open access: Creative Commons BY license
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    Rendering metals ultralow modulus and nearly hysteresis-free and linear super-elastic

    J. Zhu, Y. Gao, D. Wang, J. Li, T. Zhang and Y. Wang, Mater. Horiz., 2018, Accepted Manuscript , DOI: 10.1039/C8MH01141A

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