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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-.
Project: A1898b0043
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.
ISSN: 0925-8388
DOI: 10.1016/j.jallcom.2021.160825
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: embargo_20231202
Fulltext Availability: With Fulltext
Appears in Collections:MAE Journal Articles

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