Nano-Structure Evolution and Mechanical Properties of Al[sub.x]CoCrFeNi[sub.2.1] High-Entropy Alloy Prepared by Mechanical Alloying and Spark Plasma Sintering

The Al[sub.x] CoCrFeNi[sub.2.1] (x = 0, 0.3, 0.7, 1.0, 1.3) multi-component high-entropy alloy (HEA) was synthesized by mechanical alloying (MA) and Spark Plasma Sintering (SPS), The impact of the percentage of Al on crystal structure transition, microstructure evolution and mechanical properties we...

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Bibliographic Details
Published in:Nanomaterials (Basel, Switzerland) Switzerland), 2024-04, Vol.14 (7)
Main Authors: Liu, Guiqun, Lu, Ziteng, Zhang, Xiaoli
Format: Article
Language:English
Subjects:
Alloys
Aluminum
Analysis
Chemical synthesis
Chromium
Cobalt
Crystals
Diffraction
Iron
Mechanical properties
Methods
Nickel
Sintering
Structure
X-rays
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Summary:The Al[sub.x] CoCrFeNi[sub.2.1] (x = 0, 0.3, 0.7, 1.0, 1.3) multi-component high-entropy alloy (HEA) was synthesized by mechanical alloying (MA) and Spark Plasma Sintering (SPS), The impact of the percentage of Al on crystal structure transition, microstructure evolution and mechanical properties were studied. Crystal structure was investigated by X-ray Diffraction (XRD) and Scanning Electron Microscopy (SEM). The results show that with the increasing of Al content, the crystal structure of the alloys gradually transformed from a nanocrystalline phase of FCC to a mix of FCC and BCC nanocrystalline. The hardness was found to increase steadily from 433 HV to 565 HV due to the increase in fraction of BCC nanocrystalline phase. Thus, the compressive fracture strength increased from 1702 MPa to 2333 MPa; in contrast, the fracture strain decreased from 39.8% to 15.6%.
ISSN:2079-4991
2079-4991
DOI:10.3390/nano14070641