The Library
A high-strength precipitation hardened cobalt-free high-entropy alloy
Tools
Luebbe, Matthew, Duan, Jiaqi, Zhang, Fan, Poplawsky, Jonathan, Pommeranke, Hans, Arivu, Maalavan, Hoffman, Andrew, Buchely, Mario and Haiming, Wen (2023) A high-strength precipitation hardened cobalt-free high-entropy alloy. Materials Science and Engineering A: Structural Materials: Properties, Microstructures and Processing, 870 . 144848. doi:10.1016/j.msea.2023.144848 ISSN 0921-5093.
|
PDF
WRAP-high-strength-precipitation-hardened-cobalt-free-high-entropy-alloy-23.pdf - Accepted Version - Requires a PDF viewer. Available under License Creative Commons Attribution Non-commercial No Derivatives 4.0. Download (3046Kb) | Preview |
Official URL: https://doi.org/10.1016/j.msea.2023.144848
Abstract
Recent studies on precipitation-hardened high-entropy alloys (HEAs) demonstrate their high strength and thermal stability, making them promising materials for high-temperature structural applications such as nuclear reactors. However, many existing HEAs contain cobalt (Co), which is unsuitable for nuclear applications because of the long-term activation issue of Co. Co is also expensive and considered a critical material for other applications. Therefore, it is desired to exclude Co from the composition. A Co-free (Fe0.3Ni0.3Mn0.3Cr0.1)88Ti4Al8 HEA was developed and studied in this work. In contrast to previous Co-free HEAs, this alloy is close to equiatomic in its composition and promises a more pronounced high-entropy effect. Scanning electron microscopy, transmission electron microscopy, atom probe tomography, and synchrotron-based, high-energy X-ray diffraction were used to characterize this alloy and revealed a complex four-phase structure, with an FCC matrix, γ’ precipitates, and a network of B2 and χ phase particles. This structure granted 2151 MPa compressive strength and good thermal stability, but with limited ductility and slow precipitation kinetics. A strengthening analysis of the alloy shows that the B2 and χ provided the most significant strengthening contribution, adding 312 MPa and 788 MPa respectively. The strengthening effect from the nanoscale γ′ is also considerable, adding 608 MPa in total. This study lays the foundation for the continued development of high-strength Co-free HEAs with improved and satisfactory ductility.
Item Type: | Journal Article | ||||||||
---|---|---|---|---|---|---|---|---|---|
Subjects: | T Technology > TN Mining engineering. Metallurgy | ||||||||
Divisions: | Faculty of Science, Engineering and Medicine > Engineering > WMG (Formerly the Warwick Manufacturing Group) | ||||||||
Library of Congress Subject Headings (LCSH): | Alloys, Entropy, Order-disorder in alloys, Manufacturing processes, Alloys -- Thermal properties, Microstructure | ||||||||
Journal or Publication Title: | Materials Science and Engineering A: Structural Materials: Properties, Microstructures and Processing | ||||||||
Publisher: | Elsevier SA | ||||||||
ISSN: | 0921-5093 | ||||||||
Official Date: | 12 April 2023 | ||||||||
Dates: |
|
||||||||
Volume: | 870 | ||||||||
Article Number: | 144848 | ||||||||
DOI: | 10.1016/j.msea.2023.144848 | ||||||||
Status: | Peer Reviewed | ||||||||
Publication Status: | Published | ||||||||
Access rights to Published version: | Restricted or Subscription Access | ||||||||
Date of first compliant deposit: | 2 March 2023 | ||||||||
Date of first compliant Open Access: | 25 February 2024 | ||||||||
RIOXX Funder/Project Grant: |
|
Request changes or add full text files to a record
Repository staff actions (login required)
View Item |
Downloads
Downloads per month over past year