Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/106671
Title: Additively manufactured CoCrFeNiMn high-entropy alloy via pre-alloyed powder
Authors: Wang, Pan
Huang, Pengfei
Ng, Fern Lan
Sin, Wai Jack
Lu, Shenglu
Nai, Sharon Mui Ling
Dong, ZhiLi
Wei, Jun
Keywords: Engineering::Materials
Powder Characteristics
Pores
Issue Date: 2019
Source: Wang, P., Huang, P., Ng, F. L., Sin, W. J., Lu, S., Nai, S. M. L., . . . Wei, J. (2019). Additively manufactured CoCrFeNiMn high-entropy alloy via pre-alloyed powder. Materials & Design, 168, 107576-. doi:10.1016/j.matdes.2018.107576
Series/Report no.: Materials & Design
Abstract: An equiatomic CoCrFeNiMn high-entropy alloy (HEA) powder is produced by vacuum induction melting gas-atomization with argon gas. A detailed characterization reveals that gas atomized HEA powder is suitable for powder-bed-fusion additive manufacturing (PBFAM). Therefore, the powder with size ranging from 45 to 106 μm is applied in one of PBFAM, electron beam melting (EBM). The final EBM part is strongly affected by the feedstock. The entrapped gas pores result in a high porosity of EBM-built parts, requesting extra efforts to eliminate the pores for processing parameters optimization. After the optimization, the highly dense EBM-built parts with a hierarchical microstructure and a strong 〈100〉 texture are obtained. The hierarchical microstructure displays long columnar grains containing intragranular cellular structure (dendrites) along build direction. Deformation mechanism of the EBM-built CoCrFeNiMn HEA is dominated by dislocation with limited contribution from mechanical twinning. Experimental results reveal that the cellular structure (dendrites) does not contribute the strength without the pre-existing surrounding dislocation network. As a result, EBM-built CoCrFeNiMn HEA parts exhibit comparable tensile properties to their conventional cast counterparts. It is suggested that the EBM process and gas atomized HEA powder can be employed for fabricating single-phase HEA parts with complex geometry and good mechanical properties.
URI: https://hdl.handle.net/10356/106671
http://hdl.handle.net/10220/49641
ISSN: 0261-3069
DOI: 10.1016/j.matdes.2018.107576
Rights: © 2019 Elsevier Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:MSE Journal Articles

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