Abstract
The strength-ductility paradox is a long-sought challenge for all engineering materials. In this study, we escaped the strength-ductility trade-off by engineering nano-scale heterogeneities carefully in the advanced nanostructured Fe-based alloys through alloying with Cu and Mn additions. We demonstrated a triple ductility enhancement by 20% together with a strength improvement of 100MPa compared to the alloys with sole Cu additions, overturning a common understanding of the strength-ductility trade-off. The strength-ductility enhancement is attributed to the complex interplay between the transformation induced plasticity (TRIP) and the coherent nano-scale Cu precipitates as well as the resultant heterogeneous stress–strain partitioning and dislocation interactions.
Original language | English |
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Pages (from-to) | 213-218 |
Number of pages | 6 |
Journal | Scripta Materialia |
Volume | 186 |
DOIs | |
Publication status | Published - Sept 2020 |
Keywords
- Advanced nanostructured Fe-based alloys
- Grain boundary precipitation
- Nano-scale Cu precipitation
- Strength-ductility paradox
- Transformation induced plasticity (TRIP)
ASJC Scopus subject areas
- General Materials Science
- Condensed Matter Physics
- Mechanics of Materials
- Mechanical Engineering
- Metals and Alloys