Doubled strength and ductility via maraging effect and dynamic precipitate transformation in ultrastrong medium-entropy alloy

Hyun Chung, Won Seok Choi, Hosun Jun, Hyeon-Seok Do, Byeong-Joo Lee, Pyuck-Pa Choi, Heung Nam Han, Won-Seok Ko and Seok Su Sohn ()
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Hyun Chung: Korea University
Won Seok Choi: Korea Advanced Institute of Science and Technology
Hosun Jun: Korea Advanced Institute of Science and Technology
Hyeon-Seok Do: Pohang University of Science and Technology
Byeong-Joo Lee: Pohang University of Science and Technology
Pyuck-Pa Choi: Korea Advanced Institute of Science and Technology
Heung Nam Han: Seoul National University
Won-Seok Ko: Inha University
Seok Su Sohn: Korea University

Nature Communications, 2023, vol. 14, issue 1, 1-10

Abstract: Abstract Demands for ultrahigh strength in structural materials have been steadily increasing in response to environmental issues. Maraging alloys offer a high tensile strength and fracture toughness through a reduction of lattice defects and formation of intermetallic precipitates. The semi-coherent precipitates are crucial for exhibiting ultrahigh strength; however, they still result in limited work hardening and uniform ductility. Here, we demonstrate a strategy involving deformable semi-coherent precipitates and their dynamic phase transformation based on a narrow stability gap between two kinds of ordered phases. In a model medium-entropy alloy, the matrix precipitate acts as a dislocation barrier and also dislocation glide media; the grain-boundary precipitate further contributes to a significant work-hardening via dynamic precipitate transformation into the type of matrix precipitate. This combination results in a twofold enhancement of strength and uniform ductility, thus suggesting a promising alloy design concept for enhanced mechanical properties in developing various ultrastrong metallic materials.

Date: 2023
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DOI: 10.1038/s41467-023-35863-z

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