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Study on the mechanical properties and corrosion resistance of AlxCoFeNiCr1−x high-entropy alloys
| Content Provider | Scilit |
|---|---|
| Author | Wang, Shuai Zhao, Yuhong Cheng, Peng Guo, Qingwei Xu, Xiaotao Hou, Hua |
| Copyright Year | 2019 |
| Description | Journal: Materials Research Express The multiple principal AlxCoFeNiCr1-x (0.1≤x≤1)high entropy alloys (HEA) were fabricated by repeated arc-melting under high-purity argon atmosphere to investigate the influences the different molar ratio of Al/Cr on microstructure, mechanical properties and corrosion resistance of these alloy. With the molar ratio of Al/Cr increase, it could be found that the matrix phase in Al0.7CoFeNiCr0.3 HEA evolved from FCC -dominated to BCC -dominated, which corresponding to the segregation phase of BCC phase and FCC phase, respectively. The crystal structures of AlxCoFeNiCr1-x HEA switched from FCC phase to FCC+BCC phase to FCC+BCC+B2 phase, and then to BCC phase. The HEA with an FCC+BCC phase generally has an excellent comprehensive mechanical properties because the their complex structure seem to be balanced in strength and ductility of alloy. Through compared with the the mechanical properties of all ten alloys, the Al0.8CoFeNiCr0.2 HEA with a FCC+BCC/B2 structure shows an optimal performance. Moreover, the results of corrosion resistance showed that the addition of molar ratio of Al/Cr could result in the corrosion resistance of FCC single phase alloy decrease. The Al0.1CoFeNiCr0.9 HEA has the highest corrosion resistance, followed by the Al0.2CoFeNiCr0.8 HEA and the Al0.3CoFeNiCr0.7 HEA. The corrosion tendency of these HEA with a dual phase are consistent with the changeable volume fraction of segregation phase. For dual phase, the Al0.4CoFeNiCr0.6 HEA display a greatest corrosion resistance. The Al0.7CoFeNiCr0.3 HEA exhibits a bad corrosion resistance due to the close volume fraction between segregation phase and matrix phase. The Al1.0CoFeNiCr0 HEA with a BCC single-phase exhibits the worst corrosion resistance. A trace amount of Cr element existence in AlxCoFeNiCr1-x obviously facilitates the enhancement of the corrosion resistance. |
| Related Links | https://iopscience.iop.org/article/10.1088/2053-1591/ab3d86/pdf |
| ISSN | 20531591 |
| e-ISSN | 20531591 |
| DOI | 10.1088/2053-1591/ab3d86 |
| Journal | Materials Research Express |
| Issue Number | 12 |
| Volume Number | 6 |
| Language | English |
| Publisher | IOP Publishing |
| Publisher Date | 2019-08-21 |
| Access Restriction | Open |
| Subject Keyword | Journal: Materials Research Express Metallurgy and Metallurgical Engineering Corrosion Resistance Matrix Phase Al0.7cofenicr0.3 Hea |
| Content Type | Text |
| Resource Type | Article |
| Subject | Surfaces, Coatings and Films Metals and Alloys Biomaterials Electronic, Optical and Magnetic Materials Polymers and Plastics |
