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https://hdl.handle.net/10356/157014
Title: | Compositionally graded CoCrFeNiTₓ high-entropy alloys manufactured by laser powder bed fusion: a combinatorial assessment | Authors: | Zhao, Yakai Lau, Kwang Boon Teh, Wei Hock Lee, Jing Jun Wei, Fengxia Lin, Ming Wang, Pei Tan, Cheng Cheh Ramamurty, Upadrastatan |
Keywords: | Engineering::Mechanical engineering | Issue Date: | 2021 | Source: | Zhao, Y., Lau, K. B., Teh, W. H., Lee, J. J., Wei, F., Lin, M., Wang, P., Tan, C. C. & Ramamurty, U. (2021). Compositionally graded CoCrFeNiTₓ high-entropy alloys manufactured by laser powder bed fusion: a combinatorial assessment. Journal of Alloys and Compounds, 883, 160825-. https://dx.doi.org/10.1016/j.jallcom.2021.160825 | Project: | A1898b0043 A18B1b0061 |
Journal: | Journal of Alloys and Compounds | Abstract: | A modified laser powder bed fusion (LPBF) technique was utilized to fabricate CoCrFeNi high-entropy alloy (HEA) coupon with stepwise gradation (from 0 to ~12 at%) in Ti, to ascertain the maximum Ti content that can be added to the HEA for enhancing its strength. The microstructure and mechanical behavior of the fabricated coupon were investigated. High-resolution scanning transmission electron microscopy show the formations of second phases including body-centered cubic, Laves, and χ phases within the face-centered cubic matrix phase. The volume fractions of all the second phases increase with the Ti content, with a concomitant enhancement in the hardness. The observation of extensive cracking in the alloy region with ~12 at% Ti suggests that a maximum of ~10 at% Ti can be added during LPBF of CoCrFeNi HEA. A detailed analysis of the contributions of various strengthening mechanisms suggests that the second phases are the dominant contributors to the observed hardening with the Ti addition. While the Laves and χ phases induce substantial hardness enhancement, they also contribute to the cracking during LPBF of the high Ti-containing HEAs. | URI: | https://hdl.handle.net/10356/157014 | ISSN: | 0925-8388 | DOI: | 10.1016/j.jallcom.2021.160825 | Schools: | School of Mechanical and Aerospace Engineering | Organisations: | Institute of Materials Research and Engineering, A*STAR | Rights: | © 2021 Elsevier B.V. All rights reserved. This paper was published in Journal of Alloys and Compounds and is made available with permission of Elsevier B.V. | Fulltext Permission: | open | Fulltext Availability: | With Fulltext |
Appears in Collections: | MAE Journal Articles |
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Compositionally graded CoCrFeNiTix high-entropy alloys manufactured by laser powder bed fusion A combinatorial assessment.pdf | 2.41 MB | Adobe PDF | View/Open |
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