Phase-selective recrystallization makes eutectic high-entropy alloys ultra-ductile

Qingfeng Wu, Feng He, Junjie Li, Hyoung Seop Kim (), Zhijun Wang () and Jincheng Wang ()
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Qingfeng Wu: Northwestern Polytechnical University
Feng He: Northwestern Polytechnical University
Junjie Li: Northwestern Polytechnical University
Hyoung Seop Kim: Pohang University of Science and Technology (POSTECH)
Zhijun Wang: Northwestern Polytechnical University
Jincheng Wang: Northwestern Polytechnical University

Nature Communications, 2022, vol. 13, issue 1, 1-8

Abstract: Abstract Excellent ductility is crucial not only for shaping but also for strengthening metals and alloys. The ever most widely used eutectic alloys are suffering from the limited ductility and losing competitiveness among advanced structural materials. Here we report a distinctive concept of phase-selective recrystallization to overcome this challenge for eutectic alloys by triggering the strain hardening capacity of the duplex phases completely. We manipulate the strain partitioning behavior of the two phases in a eutectic high-entropy alloy (EHEA) to obtain the phase-selectively recrystallized microstructure with a fully recrystallized soft phase embedded in the skeleton of a hard phase. The resulting microstructure fully releases the strain hardening capacity in EHEA by eliminating the weak boundaries. Our phase-selectively recrystallized EHEA achieves a high ductility of ∼35% uniform elongation with true stress of ∼2 GPa. This concept is universal for various duplex alloys with soft and hard phases and opens new frontiers for traditional eutectic alloys as high-strength metallic materials.

Date: 2022
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DOI: 10.1038/s41467-022-32444-4

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