A Novel Low-Activation VCrFeTa<i><sub>x</sub></i>W<i><sub>x</sub></i> (<i>x</i> = 0.1, 0.2, 0.3, 0.4, and 1) High-Entropy Alloys with Excellent Heat-Softening Resistance
The microstructure, Vickers hardness, and compressive properties of novel low-activation VCrFeTa<i><sub>x</sub></i>W<i><sub>x</sub></i> (<i>x</i> = 0.1, 0.2, 0.3, 0.4, and 1) high-entropy alloys (HEAs) were studied. The alloys were fabricat...
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MDPI AG
2018-12-01
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| Online Access: | https://www.mdpi.com/1099-4300/20/12/951 |
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| author | Weiran Zhang Peter K. Liaw Yong Zhang |
| author_facet | Weiran Zhang Peter K. Liaw Yong Zhang |
| author_sort | Weiran Zhang |
| collection | DOAJ |
| description | The microstructure, Vickers hardness, and compressive properties of novel low-activation VCrFeTa<i><sub>x</sub></i>W<i><sub>x</sub></i> (<i>x</i> = 0.1, 0.2, 0.3, 0.4, and 1) high-entropy alloys (HEAs) were studied. The alloys were fabricated by vacuum-arc melting and the characteristics of these alloys were explored. The microstructures of all the alloys exhibited a typical morphology of dendritic and eutectic structures. The VCrFeTa<sub>0.1</sub>W<sub>0.1</sub> and VCrFeTa<sub>0.2</sub>W<sub>0.2</sub> alloys are essentially single phase, consisting of a disordered body-centered-cubic (BCC) phase, whereas the VCrFeTa<sub>0.2</sub>W<sub>0.2</sub> alloy contains fine, nanoscale precipitates distributed in the BCC matrix. The lattice parameters and compositions of the identified phases were investigated. The alloys have Vickers hardness values ranging from 546 HV<sub>0.2</sub> to 1135 HV<sub>0.2</sub> with the x ranging from 0.1 to 1, respectively. The VCrFeTa<sub>0.1</sub>W<sub>0.1</sub> and VCrFeTa<sub>0.2</sub>W<sub>0.2</sub> alloys exhibit compressive yield strengths of 1341 MPa and 1742 MPa, with compressive plastic strains of 42.2% and 35.7%, respectively. VCrFeTa<sub>0.1</sub>W<sub>0.1</sub> and VCrFeTa<sub>0.2</sub>W<sub>0.2</sub> alloys have excellent hardness after annealing for 25 h at 600⁻1000 °C, and presented compressive yield strength exceeding 1000 MPa with excellent heat-softening resistance at 600⁻800 °C. By applying the HEA criteria, Ta and W additions into the VCrFeTaW are proposed as a family of candidate materials for fusion reactors and high-temperature structural applications. |
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| spelling | doaj.art-3cd6c58dff17475780e0a7b63e2c9a042022-12-22T01:57:51ZengMDPI AGEntropy1099-43002018-12-01201295110.3390/e20120951e20120951A Novel Low-Activation VCrFeTa<i><sub>x</sub></i>W<i><sub>x</sub></i> (<i>x</i> = 0.1, 0.2, 0.3, 0.4, and 1) High-Entropy Alloys with Excellent Heat-Softening ResistanceWeiran Zhang0Peter K. Liaw1Yong Zhang2State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, ChinaDepartment of Materials Science and Engineering, The University of Tennessee, Knoxville, TN 37996, USAState Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, ChinaThe microstructure, Vickers hardness, and compressive properties of novel low-activation VCrFeTa<i><sub>x</sub></i>W<i><sub>x</sub></i> (<i>x</i> = 0.1, 0.2, 0.3, 0.4, and 1) high-entropy alloys (HEAs) were studied. The alloys were fabricated by vacuum-arc melting and the characteristics of these alloys were explored. The microstructures of all the alloys exhibited a typical morphology of dendritic and eutectic structures. The VCrFeTa<sub>0.1</sub>W<sub>0.1</sub> and VCrFeTa<sub>0.2</sub>W<sub>0.2</sub> alloys are essentially single phase, consisting of a disordered body-centered-cubic (BCC) phase, whereas the VCrFeTa<sub>0.2</sub>W<sub>0.2</sub> alloy contains fine, nanoscale precipitates distributed in the BCC matrix. The lattice parameters and compositions of the identified phases were investigated. The alloys have Vickers hardness values ranging from 546 HV<sub>0.2</sub> to 1135 HV<sub>0.2</sub> with the x ranging from 0.1 to 1, respectively. The VCrFeTa<sub>0.1</sub>W<sub>0.1</sub> and VCrFeTa<sub>0.2</sub>W<sub>0.2</sub> alloys exhibit compressive yield strengths of 1341 MPa and 1742 MPa, with compressive plastic strains of 42.2% and 35.7%, respectively. VCrFeTa<sub>0.1</sub>W<sub>0.1</sub> and VCrFeTa<sub>0.2</sub>W<sub>0.2</sub> alloys have excellent hardness after annealing for 25 h at 600⁻1000 °C, and presented compressive yield strength exceeding 1000 MPa with excellent heat-softening resistance at 600⁻800 °C. By applying the HEA criteria, Ta and W additions into the VCrFeTaW are proposed as a family of candidate materials for fusion reactors and high-temperature structural applications.https://www.mdpi.com/1099-4300/20/12/951low-activation high-entropy alloys (HEAs)high-temperature structural alloysmicrostructurescompressive propertiesheat-softening resistance |
| spellingShingle | Weiran Zhang Peter K. Liaw Yong Zhang A Novel Low-Activation VCrFeTa<i><sub>x</sub></i>W<i><sub>x</sub></i> (<i>x</i> = 0.1, 0.2, 0.3, 0.4, and 1) High-Entropy Alloys with Excellent Heat-Softening Resistance Entropy low-activation high-entropy alloys (HEAs) high-temperature structural alloys microstructures compressive properties heat-softening resistance |
| title | A Novel Low-Activation VCrFeTa<i><sub>x</sub></i>W<i><sub>x</sub></i> (<i>x</i> = 0.1, 0.2, 0.3, 0.4, and 1) High-Entropy Alloys with Excellent Heat-Softening Resistance |
| title_full | A Novel Low-Activation VCrFeTa<i><sub>x</sub></i>W<i><sub>x</sub></i> (<i>x</i> = 0.1, 0.2, 0.3, 0.4, and 1) High-Entropy Alloys with Excellent Heat-Softening Resistance |
| title_fullStr | A Novel Low-Activation VCrFeTa<i><sub>x</sub></i>W<i><sub>x</sub></i> (<i>x</i> = 0.1, 0.2, 0.3, 0.4, and 1) High-Entropy Alloys with Excellent Heat-Softening Resistance |
| title_full_unstemmed | A Novel Low-Activation VCrFeTa<i><sub>x</sub></i>W<i><sub>x</sub></i> (<i>x</i> = 0.1, 0.2, 0.3, 0.4, and 1) High-Entropy Alloys with Excellent Heat-Softening Resistance |
| title_short | A Novel Low-Activation VCrFeTa<i><sub>x</sub></i>W<i><sub>x</sub></i> (<i>x</i> = 0.1, 0.2, 0.3, 0.4, and 1) High-Entropy Alloys with Excellent Heat-Softening Resistance |
| title_sort | novel low activation vcrfeta i sub x sub i w i sub x sub i i x i 0 1 0 2 0 3 0 4 and 1 high entropy alloys with excellent heat softening resistance |
| topic | low-activation high-entropy alloys (HEAs) high-temperature structural alloys microstructures compressive properties heat-softening resistance |
| url | https://www.mdpi.com/1099-4300/20/12/951 |
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