Journal
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
Volume 102, Issue -, Pages 159-165Publisher
JOURNAL MATER SCI TECHNOL
DOI: 10.1016/j.jmst.2021.07.002
Keywords
High entropy alloys; Selective laser melting; In-situ alloying; Mechanical properties; Antibacterial ability
Funding
- Science and Technology Department of Liaon-ing Province , China [XLYC1802080]
- National Natural Science Foundation of China [U2006219, 51871050]
- Fundamental Research Funds for the Central Universities [N180203019, N2002019]
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In this study, a broad-spectrum antibacterial high-entropy alloy (HEA) was successfully fabricated using selective laser melting (SLM) and in-situ alloying. The SLM-fabricated HEA showed enhanced antibacterial ability compared to the conventionally fabricated HEA, making it suitable for potential applications requiring antibacterial properties.
A quasi-equiatomic CoCrFeCuNi high-entropy alloy (HEA) with a broad-spectrum antibacterial ability and good mechanical properties has been fabricated by selective laser melting (SLM) and in-situ alloying of a blend of pre-alloyed CoCrFeNi powder and Cu elemental powder. The as-built HEA alloy has a homogeneous distribution of Cu and presents a single FCC phase. Compared with the same HEA fabricated using the traditional ingot metallurgy (IM) process, the HEA alloy fabricated by SLM releases more Cu ions to prevent growth and biofilm formation by gram-negative Escherichia coli and gram-positive Staphylococcus aureus, which enhances the applicability of the HEA alloy in potential applications that requires antibacterial ability. The results of this study confirm the feasibility of combining the antibacterial CoCrFeCuNi HEA alloy and SLM technology in fabricating complex shaped parts or structures with a strong antibacterial ability to be used in medical application or other environments desired for antibacterial ability. (c) 2022 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.
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