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Title: Making metals linear super-elastic with ultralow modulus and nearly zero hysteresis

Journal Article · · Materials Horizons
DOI:https://doi.org/10.1039/C8MH01141A· OSTI ID:1486894
 [1];  [2];  [1]; ORCiD logo [3];  [4];  [2]
  1. Center of Microstructure Science, Frontier Institute of Science and Technology, Xi’an Jiaotong University, Xi’an 710049, China
  2. Department of Materials Science and Engineering, The Ohio State University, Columbus, USA
  3. Department of Nuclear Science and Engineering and Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, USA
  4. Materials Genome Institute, Shanghai University, Shanghai 200444, China

We demonstrate a novel materials design approach to achieve unprecedented properties by utilizing nanoscale chemo-mechanical coupling. In particular, by using computer simulations we demonstrate how to engineer ultralow modulus (12 GPa), nearly hysteresisfree, and linear super-elastic metals with a giant elastic strain limit (2.7%) by creating appropriate concentration modulations (CMs) at the nanoscale in the parent phase and by pre-straining to regulate the stress-induced martensitic transformation (MT). The nanoscale CMs created via spinodal decomposition produce corresponding phase stability modulations, suppress autocatalysis in nucleation, impose nano-confinements on growth, and hinder long-range ordering of transformation strain during the MT, which changes the otherwise sharp first-order transition into a smeared, macroscopically continuous transition over a large stress range. The pre-straining generates 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 a high strength and an ultralow apparent Young’s modulus have great potential for application in orthopaedic implants.

Research Organization:
The Ohio State Univ., Columbus, OH (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF); National Natural Science Foundation of China (NSFC)
Grant/Contract Number:
SC0001258; DMR-1410322; DMR-1410636
OSTI ID:
1486894
Alternate ID(s):
OSTI ID: 1610547
Journal Information:
Materials Horizons, Journal Name: Materials Horizons Vol. 6 Journal Issue: 3; ISSN 2051-6347
Publisher:
Royal Society of ChemistryCopyright Statement
Country of Publication:
United Kingdom
Language:
English
Citation Metrics:
Cited by: 22 works
Citation information provided by
Web of Science

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