Microstructures and compressive properties of AlxCoCrFeNi high entropy alloys prepared by arc melting and directional solidification
The Al _x CoCrFeNi (molar radio, x = 0.6 and 1.2) high entropy alloys (HEAs) were prepared by arc melting and directional solidification at the withdrawal rate of 150 μ m s ^−1 . All microstructures were characterized by x-ray diffraction, optical microscopy and scanning electron microscopy with an...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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IOP Publishing
2022-01-01
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| Series: | Materials Research Express |
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| Online Access: | https://doi.org/10.1088/2053-1591/ac4882 |
| _version_ | 1797746651834613760 |
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| author | Zhuhuan Yu Yawen Yan Wei Gao Xiaohui Wang Xuliang Liu Wei Du |
| author_facet | Zhuhuan Yu Yawen Yan Wei Gao Xiaohui Wang Xuliang Liu Wei Du |
| author_sort | Zhuhuan Yu |
| collection | DOAJ |
| description | The Al _x CoCrFeNi (molar radio, x = 0.6 and 1.2) high entropy alloys (HEAs) were prepared by arc melting and directional solidification at the withdrawal rate of 150 μ m s ^−1 . All microstructures were characterized by x-ray diffraction, optical microscopy and scanning electron microscopy with an energy-dispersive spectrometer. Strong similarities in phase constituent were observed between the as-cast samples and directionally solidified samples. The Al _0.6 CoCrFeNi HEA and Al _1.2 CoCrFeNi HEA fabricated by two different techniques respectively consisted of Cr-Fe-Co enriched FCC phase + Al-Ni enriched BCC phase and Al-Ni enriched B2 phase + Cr-Fe-Co enriched A2 phase. It was micromorphology found that directional solidification could not only make the microstructures arranged regularly but also coarsen the grains. This has been attributed to the preferred grain orientation and lower cooling rate during directional solidification process. Compression testing showed that the compressive ductility of directionally solidified samples decreased obviously. The ultimate compressive strength of Al _0.6 CoCrFeNi HEA increased from 1 675 MPa to 1 903 MPa, but the strength of Al _1.2 CoCrFeNi HEA decreased from 2 183 MPa to 1 463 MPa. The difference in strength has been suggested to be the result of micropores in the matrix. |
| first_indexed | 2024-03-12T15:40:53Z |
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| id | doaj.art-190ae37e88374438b63cafc225edef3e |
| institution | Directory Open Access Journal |
| issn | 2053-1591 |
| language | English |
| last_indexed | 2024-03-12T15:40:53Z |
| publishDate | 2022-01-01 |
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| series | Materials Research Express |
| spelling | doaj.art-190ae37e88374438b63cafc225edef3e2023-08-09T15:58:52ZengIOP PublishingMaterials Research Express2053-15912022-01-019101651010.1088/2053-1591/ac4882Microstructures and compressive properties of AlxCoCrFeNi high entropy alloys prepared by arc melting and directional solidificationZhuhuan Yu0https://orcid.org/0000-0001-5214-7985Yawen Yan1https://orcid.org/0000-0003-1472-6155Wei Gao2Xiaohui Wang3Xuliang Liu4Wei Du5College of Materials Science and Engineering, Xi’an University of Science and Technology , Xian, 710054, People’s Republic of ChinaCollege of Materials Science and Engineering, Xi’an University of Science and Technology , Xian, 710054, People’s Republic of ChinaCollege of Materials Science and Engineering, Xi’an University of Science and Technology , Xian, 710054, People’s Republic of ChinaCollege of Materials Science and Engineering, Xi’an University of Science and Technology , Xian, 710054, People’s Republic of ChinaCollege of Materials Science and Engineering, Xi’an University of Science and Technology , Xian, 710054, People’s Republic of ChinaCollege of Materials Science and Engineering, Xi’an University of Science and Technology , Xian, 710054, People’s Republic of ChinaThe Al _x CoCrFeNi (molar radio, x = 0.6 and 1.2) high entropy alloys (HEAs) were prepared by arc melting and directional solidification at the withdrawal rate of 150 μ m s ^−1 . All microstructures were characterized by x-ray diffraction, optical microscopy and scanning electron microscopy with an energy-dispersive spectrometer. Strong similarities in phase constituent were observed between the as-cast samples and directionally solidified samples. The Al _0.6 CoCrFeNi HEA and Al _1.2 CoCrFeNi HEA fabricated by two different techniques respectively consisted of Cr-Fe-Co enriched FCC phase + Al-Ni enriched BCC phase and Al-Ni enriched B2 phase + Cr-Fe-Co enriched A2 phase. It was micromorphology found that directional solidification could not only make the microstructures arranged regularly but also coarsen the grains. This has been attributed to the preferred grain orientation and lower cooling rate during directional solidification process. Compression testing showed that the compressive ductility of directionally solidified samples decreased obviously. The ultimate compressive strength of Al _0.6 CoCrFeNi HEA increased from 1 675 MPa to 1 903 MPa, but the strength of Al _1.2 CoCrFeNi HEA decreased from 2 183 MPa to 1 463 MPa. The difference in strength has been suggested to be the result of micropores in the matrix.https://doi.org/10.1088/2053-1591/ac4882high entropy alloysdirectional solidificationmicrostructuresmechanical properties |
| spellingShingle | Zhuhuan Yu Yawen Yan Wei Gao Xiaohui Wang Xuliang Liu Wei Du Microstructures and compressive properties of AlxCoCrFeNi high entropy alloys prepared by arc melting and directional solidification Materials Research Express high entropy alloys directional solidification microstructures mechanical properties |
| title | Microstructures and compressive properties of AlxCoCrFeNi high entropy alloys prepared by arc melting and directional solidification |
| title_full | Microstructures and compressive properties of AlxCoCrFeNi high entropy alloys prepared by arc melting and directional solidification |
| title_fullStr | Microstructures and compressive properties of AlxCoCrFeNi high entropy alloys prepared by arc melting and directional solidification |
| title_full_unstemmed | Microstructures and compressive properties of AlxCoCrFeNi high entropy alloys prepared by arc melting and directional solidification |
| title_short | Microstructures and compressive properties of AlxCoCrFeNi high entropy alloys prepared by arc melting and directional solidification |
| title_sort | microstructures and compressive properties of alxcocrfeni high entropy alloys prepared by arc melting and directional solidification |
| topic | high entropy alloys directional solidification microstructures mechanical properties |
| url | https://doi.org/10.1088/2053-1591/ac4882 |
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