A novel single-crystal L12-strengthened Co-rich high-entropy alloy with excellent high-temperature strength and antioxidant property
Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review
Author(s)
Related Research Unit(s)
Detail(s)
Original language | English |
---|---|
Pages (from-to) | 2343-2350 |
Journal / Publication | Journal of Materials Research and Technology |
Volume | 23 |
Online published | 1 Feb 2023 |
Publication status | Published - Mar 2023 |
Link(s)
DOI | DOI |
---|---|
Attachment(s) | Documents
Publisher's Copyright Statement
|
Link to Scopus | https://www.scopus.com/record/display.uri?eid=2-s2.0-85150265165&origin=recordpage |
Permanent Link | https://scholars.cityu.edu.hk/en/publications/publication(174f75a6-86dc-4be2-ac28-6db510d9d82c).html |
Abstract
Severe intermediate-temperature embrittlement as well as rapid softening and oxidation at high temperatures are significant problems for high-entropy alloys (HEAs) in polycrystalline structures, which greatly limit their applications in modern industries. In this study, a novel Co-rich single-crystal high-entropy alloy (HEA), Co41Ni35Al11·5Ta2·5Cr4Ti6 (at.%), was innovatively developed. After isothermally aged at 1250 °C, this alloy exhibits an ultrahigh volume fraction of cuboidal L12-type nanoprecipitates (∼80%) which is higher than those of previous Co-based superalloys. More importantly, the present HEA shows excellent mechanical performance at both ambient and elevated temperatures, and no intermediate temperature embrittlement and rapid softening were observed. Noticeably, the yield strength can still maintain at ∼800 and ∼500 MPa when tested at 900 and 1000 °C, which are superior to other conventional single-crystal alloys. Moreover, extraordinary oxidation resistance can be achieved at the high temperature of 1000 °C due to the formation of a compact sandwich-structured oxide layer. © 2023 The Author(s). Published by Elsevier B.V
Research Area(s)
- High-entropy alloy, High-temperature strength, Microstructures, Oxidation properties, Precipitation strengthening
Citation Format(s)
A novel single-crystal L12-strengthened Co-rich high-entropy alloy with excellent high-temperature strength and antioxidant property. / Xiao, W.C.; Liu, S.F.; Zhao, Y.L. et al.
In: Journal of Materials Research and Technology, Vol. 23, 03.2023, p. 2343-2350.
In: Journal of Materials Research and Technology, Vol. 23, 03.2023, p. 2343-2350.
Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review
Download Statistics
No data available