Improving strength and plasticity via pre-assembled dislocation networks in additively manufactured refractory high entropy alloy

Author Identifier

Lai Chang Zhang: https://orcid.org/0000-0003-0661-2051

Document Type

Journal Article

Publication Title

Acta Materialia

Volume

283

Publisher

Elsevier

School

Centre for Advanced Materials and Manufacturing / School of Engineering

RAS ID

77384

Funders

National Key Research and Development Program of China (2024YFE0109000) / National Natural Science Foundation of China (52274387, 52311530772) / Medical-Engineering Cross Foundation of Shanghai Jiao Tong University (YG2024LC04) / Edith Cowan University industrial grant (G1006320) / Edith Cowan University DVC strategic research support fund (23965)

Comments

Liu, C., Zhang, L. C., Wang, K., & Wang, L. (2025). Improving strength and plasticity via pre-assembled dislocation networks in additively manufactured refractory high entropy alloy. Acta Materialia, 283. https://doi.org/10.1016/j.actamat.2024.120526

Abstract

Refractory high entropy alloys (RHEAs), as a novel class of multi-principal element alloys, have attracted significant attention owing to their excellent properties. However, their low plasticity limits their potential applications, while the high melting points of the alloying elements face challenges to additive manufacturing (AM). Herein, RHEA, with extensively distributed cellular structure within their grains, was successfully fabricated using AM. Furthermore, we proposed a simple strategy to form a complete dislocation network within the cellular structure region in advance through cyclic deformation processing in the elastic stage (microplastic deformation). Dislocation networks are entangled with other dislocations, creating numerous pinned points adjacent cell walls, which impede dislocation motion. As a result, the cyclic deformation processing of RHEA achieves a yield strength of 1136 MPa while maintaining 50 % deformation strain without fracturing. The cyclic deformation processing method provides a route to strengthen additively manufactured alloys, offering a solution to overcome the trade-off between strength and plasticity.

DOI

10.1016/j.actamat.2024.120526

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