Multicomponent intermetallic nanoparticles and superb mechanical behaviors of complex alloys
Top Cited Papers
- 23 November 2018
- journal article
- research article
- Published by American Association for the Advancement of Science (AAAS) in Science
- Vol. 362 (6417), 933-937
- https://doi.org/10.1126/science.aas8815
Abstract
Alloy design based on single–principal-element systems has approached its limit for performance enhancements. A substantial increase in strength up to gigapascal levels typically causes the premature failure of materials with reduced ductility. Here, we report a strategy to break this trade-off by controllably introducing high-density ductile multicomponent intermetallic nanoparticles (MCINPs) in complex alloy systems. Distinct from the intermetallic-induced embrittlement under conventional wisdom, such MCINP-strengthened alloys exhibit superior strengths of 1.5 gigapascals and ductility as high as 50% in tension at ambient temperature. The plastic instability, a major concern for high-strength materials, can be completely eliminated by generating a distinctive multistage work-hardening behavior, resulting from pronounced dislocation activities and deformation-induced microbands. This MCINP strategy offers a paradigm to develop next-generation materials for structural applications.Keywords
Funding Information
- National Natural Science Foundation of China (51625404)
- Research Grants Council, University Grants Committee, Hong Kong (CityU 11209314)
- Research Grants Council, University Grants Committee, Hong Kong (CityU 11205515)
- Research Grants Council, University Grants Committee, Hong Kong (C1027-14E)
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