Quad-heterostructure precipitation-strengthened high-entropy alloy overcomes strength-ductility trade-off from cryogenic to intermediate temperatures
We use a multi-heterostructure strategy to mitigate temperature-induced brittleness and strain-softening in precipitation-strengthened high-entropy alloys (PSHEAs). A PSHEA consisting of four types of heterostructures, including deformed/recrystallization grains bands inside with irregularly-shaped/...
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| Main Authors: | , , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Taylor & Francis Group
2025-04-01
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| Series: | Materials Research Letters |
| Subjects: | |
| Online Access: | https://www.tandfonline.com/doi/10.1080/21663831.2025.2465803 |
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| Summary: | We use a multi-heterostructure strategy to mitigate temperature-induced brittleness and strain-softening in precipitation-strengthened high-entropy alloys (PSHEAs). A PSHEA consisting of four types of heterostructures, including deformed/recrystallization grains bands inside with irregularly-shaped/spheroidal coherent precipitates, and smooth/serrated grain and precipitate-matrix interfaces, is successfully synthesized. The resultant PSHEA exhibits significantly-enhanced strength and uniform elongation simultaneously at −196–700 °C. This overcoming of the strength-ductility trade-off is attributed to a synergistic hetero-deformation-induced strengthening effect, and a two-level strain-delocalization toughening effect. Our findings offer a promising pathway to develop ultra-strong, ductile, and strain-hardenable PSHEAs and superalloys in a wide temperature range. |
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| ISSN: | 2166-3831 |