Unveiling the mechanisms of strength–ductility synergy in an additively manufactured nanolamellar high-entropy alloy

Shubo Gao, Weiming Ji, Qi Zhu, Asker Jarlöv, Xueyu Bai, Xiaojun Shen, Yong Liu, Mui Ling Sharon Nai, Huajian Gao and Kun Zhou ()
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Shubo Gao: Nanyang Technological University
Weiming Ji: Nanyang Technological University
Qi Zhu: Nanyang Technological University
Asker Jarlöv: Nanyang Technological University
Xueyu Bai: Nanyang Technological University
Xiaojun Shen: Nanyang Technological University
Yong Liu: Central South University
Mui Ling Sharon Nai: Technology and Research (A*STAR)
Huajian Gao: Tsinghua University
Kun Zhou: Nanyang Technological University

Nature Communications, 2025, vol. 16, issue 1, 1-9

Abstract: Abstract The combination of alloy design and advanced manufacturing techniques inspires solutions to critical engineering challenges, such as simultaneously achieving high strength and high ductility in structural alloys. Eutectic high-entropy alloys (EHEAs) are particularly promising for their integration of both strong and ductile phases. Here, using valence electron concentration as a criterion, we employ laser powder bed fusion (L-PBF) to fabricate Al19Co20Fe20Ni41 EHEA with a nanolamellar microstructure, chosen specifically for its increased fraction of ductile face-centred cubic phase. The EHEA processed by L-PBF demonstrates a combination of high yield strength exceeding 1.3 GPa and large uniform elongation of 20%. This strength–ductility synergy arises from the coherent nanoprecipitates, nanolamellar structures, hierarchical microstructure heterogeneity, and deformation-induced nanovoids activated within the hard body-centred cubic lamellae. This study provides a pathway for designing high-performance alloys by integrating multiple deformation mechanisms, offering opportunities for advanced structural material development.

Date: 2025
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DOI: 10.1038/s41467-025-64871-4

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