Annealing effect for the Al^sub 0.3^CoCrFeNi high-entropy alloy fibers

High-entropy alloy fibers with excellent performance potential are desired for functional applications. A previous study on the Al0.3CoCrFeNi high-entropy fiber reported a tensile fracture strength of 1200 MPa and elongation of 8% at room temperature (Acta Mater. 123 (2017) 285). The goal of this st...

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Bibliographic Details
Published in:Journal of alloys and compounds 2019-03, Vol.778, p.23
Main Authors: Li, Dongyue, Gao, Michael C, Hawk, Jeffrey A, Zhang, Yong
Format: Article
Language:English
Subjects:
Annealing
Elongation
Face centered cubic lattice
Fibers
Fracture strength
High entropy alloys
Microstructure
Nickel aluminides
Nickel base alloys
Nickel compounds
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Summary:High-entropy alloy fibers with excellent performance potential are desired for functional applications. A previous study on the Al0.3CoCrFeNi high-entropy fiber reported a tensile fracture strength of 1200 MPa and elongation of 8% at room temperature (Acta Mater. 123 (2017) 285). The goal of this study is to improve the ductility of Al0.3CoCrFeNi high-entropy fiber by manipulating the microstructure through annealing. Al0.3CoCrFeNi fibers at Φ1.0 mm and Φ1.6 mm diameters were annealed at 900 °C for 10 min, 30 min, 300 min and 720 min, respectively. The resulting microstructure is a fine face-centered cubic (FCC) structure with grain sizes less than ~3 μm, which were strengthened by dense NiAl-type ordered body-centered cubic (B2) precipitation. The fibers achieved a fracture strength greater than 900 MPa with an elongation of over 25% at room temperature.
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2018.11.116