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Title: 3D printing of ductile equiatomic Fe-Co alloy for soft magnetic applications
Authors: Li, Shihao
Lau, Kwang Boon
Wuu, Delvin
Wei, Fengxia
Lin, Ming
Cheong, Augustine
Wang, Pei
Tan, Cheng Cheh
Ramamurty, Upadrasta
Keywords: Engineering::Mechanical engineering
Issue Date: 2021
Source: Li, S., Lau, K. B., Wuu, D., Wei, F., Lin, M., Cheong, A., Wang, P., Tan, C. C. & Ramamurty, U. (2021). 3D printing of ductile equiatomic Fe-Co alloy for soft magnetic applications. Additive Manufacturing, 47, 102291-.
Project: A18b1B0061
Journal: Additive Manufacturing
Abstract: The equiatomic Fe-Co alloy is an ideal soft magnetic material due to the combination of high saturation magnetization, permeability and low coercivity it offers. The ordered B2 phase in it, however, makes it highly brittle and hence unsuitable for industrial-scale manufacturing of bulk soft magnets. In this work, we employ the laser powder bed fusion (LPBF) technique—a widely used one for additive manufacturing of metallic parts—to fabricate bulk equiatomic Fe-Co blocks with a microstructure that almost-exclusively contains the disordered body centered cubic (BCC) phase. It plus the high dislocation density (an inherent attribute of the LPBF technique) impart considerable ductility to the as printed alloy, which will make it highly amenable for post-processing mechanical operations such as machining. Subsequent annealing heat treatment (HT) will facilitate disordered BCC to ordered B2 phase transformation and reduction in dislocation density and residual stresses, all of which will maximize the soft magnetic properties. This study demonstrates a viable method to manufacture equiatomic Fe-Co parts with desired geometry and magnetic properties.
ISSN: 2214-7810
DOI: 10.1016/j.addma.2021.102291
Schools: School of Mechanical and Aerospace Engineering 
Organisations: Institute of Materials Research and Engineering, A*STAR
Rights: © 2021 Elsevier B.V. All rights reserved.
Fulltext Permission: none
Fulltext Availability: No Fulltext
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