Deformation mechanisms of additively manufactured TiNbTaZrMo refractory high-entropy alloy: The role of cellular structure

Document Type

Journal Article

Publication Title

International Journal of Plasticity

Volume

173

Publisher

Elsevier

School

Centre for Advanced Materials and Manufacturing / School of Engineering

Funders

National Natural Science Foundation of China

Comments

Liu, C., Wang, Y., Zhang, Y., Zhang, L. C., & Wang, L. (2024). Deformation mechanisms of additively manufactured TiNbTaZrMo refractory high-entropy alloy: The role of cellular structure. International Journal of Plasticity, 173, article 103884. https://doi.org/10.1016/j.ijplas.2024.103884

Abstract

Additive manufacturing of refractory high-entropy alloys (RHEA) is challenging, limited information is available on the microstructure and mechanical properties of as-built RHEA. In this work, Ti1.5Nb1Ta0.5Zr1Mo0.5 (TNTZM; at%) alloy is successfully fabricated by additive manufacturing. It is characterized by distinctive cellular structures, exhibited outstanding plasticity of 50 %, and a yield strength of 904 MPa. The cellular structure hindered dislocations transfer between adjacent cells and limited dislocation slip inside the cells, thereby significantly improving strength and uniform deformation. Moreover, the cellular structure facilitated the redistribution of dislocations during later deformation to avoid strain concentrations within the grains. The regulated dislocation initiation on demand during the evolution of the cellular structure at the different deformation stages is proposed. This work provides new insights improving the mechanical properties of additive manufactured RHEA.

DOI

10.1016/j.ijplas.2024.103884

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