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http://hdl.handle.net/10397/94232
Title: | A novel L1₂-strengthened multicomponent Co-rich high-entropy alloy with both high γ′-solvus temperature and superior high-temperature strength | Authors: | Cao, BX Kong, HJ Ding, ZY Wu, SW Luan, JH Jiao, ZB Lu, J Liu, CT Yang, T |
Issue Date: | 1-Jul-2021 | Source: | Scripta materialia, 1 July 2021, v. 199, 113826 | Abstract: | A L1₂-strengthened multicomponent Co-rich high-entropy alloy with superior microstructural stability was developed in this study. High-density cuboidal γ′ particles were found to embed in the matrix for the alloy subjected to isothermal aging at temperatures ranging from 800 to 1100 °C without the formation of brittle intermetallic phases neither at grain boundaries nor grain interior after long-term thermal exposure. Atom probe analyses indicated that Ta and Nb elements preferentially partitioned to the γ′ intermetallic phase, which is found to be substantially important for stabilizing the L1₂ ordered crystalline structure. More importantly, the present alloy exhibited a good combination of both high γ′-solvus temperature (1125°C) and low mass density (8.28 g cm−3), together with superb high-temperature tensile strength (755 MPa at 800 °C and 664 MPa at 900 °C). The present findings offer an essential paradigm for designing advanced L1₂-strengthened high-temperature alloys with broader temperature capabilities based on Co. | Keywords: | Co-rich high-entropy alloy High-temperature strength Microstructural stability Solute partitioning |
Publisher: | Pergamon Press | Journal: | Scripta materialia | ISSN: | 1359-6462 | EISSN: | 1872-8456 | DOI: | 10.1016/j.scriptamat.2021.113826 | Rights: | © 2021 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved. © 2021. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/. The following publication Cao, B. X., Kong, H. J., Ding, Z. Y., Wu, S. W., Luan, J. H., Jiao, Z. B., ... & Yang, T. (2021). A novel L12-strengthened multicomponent Co-rich high-entropy alloy with both high γ′-solvus temperature and superior high-temperature strength. Scripta Materialia, 199, 113826 is available at https://doi.org/10.1016/j.scriptamat.2021.113826. |
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Ding_Novel_L12-Strengthened_Multicomponent.pdf | Pre-Published version | 1.44 MB | Adobe PDF | View/Open |
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