Title

Selective laser melting of bulk immiscible alloy with enhanced strength: Heterogeneous microstructure and deformation mechanisms

Document Type

Journal Article

Publication Title

Journal of Materials Science & Technology

Volume

104

First Page

81

Last Page

87

Publisher

Elsevier

School

School of Engineering

RAS ID

40642

Funders

MOE Key Lab of Disaster Forecast and Control in Engineering in Jinan University

Guangdong Basic and Applied Basic Research Foundation

Comments

Zhou, S., Xie, M., Wu, C., Yi, Y., Chen, D., & Zhang, L. C. (2022). Selective laser melting of bulk immiscible alloy with enhanced strength: Heterogeneous microstructure and deformation mechanisms. Journal of Materials Science & Technology, 104, 81-87.

https://doi.org/10.1016/j.jmst.2021.06.062

Abstract

To overcome the dimension limits of immiscible alloys produced by traditional techniques and enhance their mechanical properties, bulk Cu-Fe-based immiscible alloy with abundant nanotwins and stacking faults was successfully produced by selective laser melting (SLM). The SLM-produced bulk immiscible alloy displays a heterogeneous microstructure characterized by micro-scaled γ-Fe particles dispersed in fine ε-Cu matrix with a high fraction (∼92%) of high-angle grain boundaries. Interestingly, abundant nanotwins and stacking faults are generated in the interior of nano-scaled γ-Fe particles embedded within ε-Cu matrix. The heterogeneous interface of soft domains (ε-Cu) and hard domains (γ-Fe) not only induces the geometrically necessary dislocations (GNDs) but also affects the dislocation propagation during plastic deformation. Therefore, the bimodal heterogeneous interface, and the resistance of nanotwins and stacking faults to the propagation of partial dislocation make the bulk immiscible alloy exhibit an enhanced strength of ∼590 MPa and a good ductility of ∼8.9%.

DOI

10.1016/j.jmst.2021.06.062

Access Rights

subscription content

Research Themes

Natural and Built Environments

Priority Areas

Engineering, technology and nanotechnology

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