Investigating the effect of hot -rolling and cold -rolling on the microstructure and mechanical properties of high entropy alloy AlCoCrFeNi2.1
Eutectic high-entropy alloys (EHEAs) exhibit better mechanical and physical behavior compared to conventional alloys. In this study, the eutectic high-entropy alloy AlCoCeFeNi₂.₁ was prepared by the arc melting process. Then, a hot rolling process was performed, followed by an intense cold rolling p...
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| Main Authors: | , |
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| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2025-05-01
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| Series: | Journal of Materials Research and Technology |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2238785425013596 |
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| Summary: | Eutectic high-entropy alloys (EHEAs) exhibit better mechanical and physical behavior compared to conventional alloys. In this study, the eutectic high-entropy alloy AlCoCeFeNi₂.₁ was prepared by the arc melting process. Then, a hot rolling process was performed, followed by an intense cold rolling process that reduced the thickness by 90% of the initial thickness. The results obtained from microstructural examination showed that the alloy contains two completely different phases, L12 and B2. The microstructure of the alloy in the as-cast condition consists of dendrites and eutectic layers. By performing the hot rolling process, the microstructure of the alloy changes, and the dendritic arms become fragmented and dispersed throughout the matrix. After severe cold rolling, a large portion of the eutectic structure is destroyed, and the dendrites are elongated in the direction of rolling. Microhardness results showed that the cold-rolled sample had a hardness of 459 Vickers, which is a significant increase compared to the hot-rolled sample with a hardness of 288 Vickers and the as-cast sample with a hardness of 320 Vickers. The shear punch test (SPT) results also indicate an increase in the shear strength of the alloy from 276 MPa for the as-cast sample to 390 MPa for the cold-rolled sample. The results of the tensile test at ambient temperature showed that the as-cast sample had an elongation percentage of 19.26% and a strength of 1078 MPa. By cold rolling the alloy, the strength reached 1956 MPa, but the elongation percentage decreased to 8.8%. The results of XRD analysis also showed that no new phases or intermetallic compounds were formed in the alloy during the hot and cold rolling processes. |
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| ISSN: | 2238-7854 |