Hierarchically heterogeneous microstructure enables ultrahigh-strength and good ductility in selective laser melted eutectic high-entropy alloys
Achieving favorable strength-ductility synergy has long been one of the main challenges for developing structural materials. The current work reports a selective laser melted eutectic high-entropy alloy with ultrahigh-strength (yield strength 1446 MPa, ultimate tensile strength 1737 MPa) and good du...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2023-05-01
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| Series: | Journal of Materials Research and Technology |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2238785423006877 |
| Summary: | Achieving favorable strength-ductility synergy has long been one of the main challenges for developing structural materials. The current work reports a selective laser melted eutectic high-entropy alloy with ultrahigh-strength (yield strength 1446 MPa, ultimate tensile strength 1737 MPa) and good ductility (elongation 11%), achieved by tuning the hierarchically heterogeneous microstructures from micro-to nano-scale. Both of nano-sized B2 and L12 phases effectively hinder the dislocation motion and thus significantly improve the strengths. The cellular face-centered cubic matrix ensures the uniform deformation of the alloy, and the possible brittle failure of the hard B2 phase is alleviated by Cr-rich clusters. |
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| ISSN: | 2238-7854 |