Synergistic creep strengthening by multi-component L1 <sub>2</sub> and MC carbides in an additively manufactured hierarchical heterostructure
An additively manufactured hierarchical triple-phase heterostructure, comprising a face-centred cubic (FCC) matrix, multi-component L12 precipitates, and nanoscale MC carbides, is engineered in a Ni-rich multi-component alloy through the composition-guided design and tailored heat treatments informed by thermodynamic calculations. The chemically complex L12 precipitates with a bimodal-size distribution exhibit markedly increased antiphase boundary energies and critical resolved shear stresses, while the coherent multi-component MC carbides provide persistent Zener-pinning effect, jointly stabilizing grain and phase boundaries during high-temperature creep. These synergistic strengthening pathways suppress dynamic coarsening and dislocation motion, thereby enabling exceptional creep resistance at 900°C under high applied stresses.
Authors
- Lei Fan (ORCID: https://orcid.org/0000-0002-2509-6198)
- Zhenfei Jiang
- Zhicheng Wei
- Shoufeng Yang
- Peter K. Liaw
- Shiwei Wu
- Tao Yang
Institutions
- National University of Singapore (SG)
- City University of Hong Kong (HK)
- Shanghai Jiao Tong University (CN)
- Chongqing Institute of Green and Intelligent Technology (CN)
- University of Tennessee at Knoxville (US)
Publication Details
- Journal
- Materials Research Letters
- Published
- 2026-02-14
- DOI
- https://doi.org/10.1080/21663831.2026.2630988
- Primary Topic
- High Temperature Alloys and Creep
- Type
- article
- Field-Weighted Citation Impact
- 0.00